Z15 大气环境有毒害物质分析方法 标准查询与下载

ISO 13964:1998 空气质量 环境空气中臭氧的测定 紫外分光光度法

This International Standard specifies an ultraviolet (UV) photometric method for the determination of ozone in ambient air. It is applicable to the determination of ozone concentrations in the range 2 μg/m (volume fraction of 1 × 10) to 2 mg/m (volume fraction of 1 × 10). Furthermore, this International Standard uses the reference conditions of 25 ℃ and 101,25 kPa; however, reference temperatures of 0 ℃ and 20 ℃ are also acceptable. For calibration, this International Standard specifies ultraviolet photometry as the primary reference procedure, because of its proven accuracy and specificity to ozone. The use of secondary reference procedures (often called transfer standards), including non-UV methods, is allowed if they have been previously calibrated by the primary UV reference procedure (see ISO 6879 for definitions).

Air quality - Determination of ozone in ambient air - Ultraviolet photometric method

JIS Z 2382:1998 大气腐蚀性评价用污染度的测定

この規格は，大気中の二酸化硫黄(硫黄酸化物)及び大気浮遊塩分(海塩泣子)の付着度を測定する方法について規定する。

Determination of pollution for evaluation of corrosivity of atmospheres

BS ISO 13752:1998 空气质量.在野外条件下采用作为第2种基准方法对不确定性测量的评估

This International Standard specifies a method for assessing the measurement uncertainty of a calibrated measurement method (test method) applied under field conditions using a second method as a reference (reference method). The reference method may not necessarily be a legally prescribed measurement method. The measurement uncertainty is derived from measurements made in parallel on real samples by comparing the measured values of the test method with those of the reference method. The result is only valid within the range of the measurements obtained. The test is designed especially for method validation.

Air quality - Assessment of uncertainty of a measurement method under field conditions using a second method as reference

ISO 13752:1998 空气质量 采用第二种方法作为参照的现场条件下测量方法的不确定度的评定

This International Standard specifies a method for assessing the measurement uncertainty of a calibrated measurement method (test method) applied under field conditions using a second method as a reference (reference method). The reference method may not necessarily be a legally prescribed measurement method. The measurement uncertainty is derived from measurements made in parallel on real samples by comparing the measured values of the test method with those of the reference method. The result is only valid within the range of the measurements obtained. The test is designed especially for method validation.

Air quality - Assessment of uncertainty of a measurement method under field conditions using a second method as reference

ISO 11564:1998 固定源排放 氮氧化物质量浓度的测定 萘乙二胺分光光度法

This International Standard specifies a photometric method for the determination of the mass concentration of nitrogen oxides in exhaust gases from ducts or chimneys. NOTE — Nitrogen oxides (NOx) are practically defined as the sum of NO and NO2. The mass concentration of NOx is expressed as the equivalent NO2 concentration in milligrams per cubic metre. The method is applicable to the determination of the mass concentration of nitrogen oxides in exhaust gases from combustion processes, processes for surface treatment of metals and from organic chemical reactions, if necessary after removal by washing, in-furnace reduction and/or catalytic denitration, prior to their dispersion into the atmosphere. This International Standard is applicable to the concentration range 5 mg/m to 1000 mg/m as NO2 for a sample gas volume of 1000 ml. For gas concentrations greater than 1000 mg/m, the determination of sample gas concentrations up to 5000 mg/m can be performed by diluting the sample solution or by taking an aliquot of the sample solution. This International Standard is not applicable to the determination of dinitrogen monoxide (N2O).

Stationary source emissions - Determination of the mass concentration of nitrogen oxides - Naphthylethylenediamine photometric method

ASTM D5281-98(2005) 在周围环境中,工作地点或室内环境中六价氯采集和分析的标准试验方法

Hexavalent chromium has been shown to be a human respiratory carcinogen in epidemiological studies when humans are exposed to relatively high airborne concentrations. Such high exposures may also induce dermal sensitization to hexavalent chromium in humans (5). Ambient atmospheric concentrations of hexavalent chromium are well below detection limits of sampling methods including Test Method D 3586 and NIOSH-7600 (1). Objective assessment of ambient atmospheric concentrations of hexavalent chromium provides a means of evaluating exposures to atmospheric hexavalent chromium in a manner that can be related to health-based risk levels. Collecting such actual monitoring data reduces or eliminates the need for theoretical resuspension modeling and provides improved basis for health assessments of potential exposures (5). The buffered impinger sampling technique provides pH control of the sampling medium, which stabilizes the oxidation state of hexavalent chromium during sampling (6). Ion chromatography provides a means of separating the hexavalent chromium from other species present in the sample, many of which interfere with other detection methods. The combination of this separation with a sensitive colorimetric detection method provides a selective and sensitive analytical method for hexavalent chromium with minimal sample preparation (4). 1.1 This test method covers the collection and measurement of hexavalent chromium [Cr(VI)] in the ambient atmosphere. 1.2 This test method collects and stabilizes atmospheric hexavalent chromium using an alkaline impinger buffer solution in a wet impingement sampling technique. Lead chromate [PbCrO4], generally considered poorly soluble in water, is soluble in the impinger solution up to 940 g/L as hexavalent chromium. 1.3 This test method measures hexavalent chromium using an ion chromatographic separation combined with a post separation reaction with a colorimetric reagent and photometric detection. 1.4 This test method is applicable in the range from 0.2 to 100 ng/m3 of hexavalent chromium in the atmosphere assuming 20 m3 of air sample. The range can be extended upwards by appropriate dilution. 1.5 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Test Method for Collection and Analysis of Hexavalent Chromium in Ambient Atmospheres

ASTM D2010/D2010M-98(2010) 用二氧化铅蜡烛法评定大气中活性硫化物总含量的标准试验方法

Sulfur oxide gases are produced during the combustion of materials containing sulfur. These gases are precursors of atmospheric sulfuric acid, which has been shown to be injurious to living creatures and plants, as well as some inanimate materials such as metals, limestone and sandstone building materials. Sulfur dioxide is moderately toxic and strongly phytotoxic to many species. Permissible ambient levels of SO2 have been established by law. When it is necessary to establish whether ambient air concentrations of sulfuric acid precursors, such as sulfur oxides, are present and to comply with legal criteria, manual and automatic monitoring systems specific for the individual sulfur species are used. Likely locations for monitoring sites for the estimation of concentrations and concentration trends over long periods of time can be screened conveniently using the PbO 2 candles or sulfation plates. Atmospheric corrosion of metallic materials is a function of many weather and atmospheric variables. The effect of specific corrodants, such as SO2, can accelerate the atmospheric corrosion of metals or structures significantly. The PbO2 candle and sulfation plate test methods provide simple techniques to monitor SO2 levels in the atmosphere independently to yield a weighted average result. The results of these test methods are useful for characterizing atmospheric corrosion test sites regarding the effective average concentrations of SO2 in the atmosphere at these locations. These test methods are useful for determining microclimatic seasonal and long-term variations in effective average SO2 concentrations. The results of these test methods may be used in correlations of atmospheric corrosion rates with atmosphere data to determine the sensitivity of the corrosion rate to the SO2 level. These test methods may also be used with other test methods to characterize the atmosphere at sites at which buildings or other construction are planned in order to determine the extent of protective measures required for the materials of construction.1.1 These test methods describe the evaluation of the total sulfation activity in the atmosphere. Because of its oxidizing power, lead dioxide (PbO2) converts not only sulfur dioxide (SO2), but other compounds, such as mercaptans and hydrogen sulfide, into sulfate. It fixes sulfur trioxide and sulfuric acid mist present in the atmosphere (see Note 1). 1.2 Test Method A describes the use of a PbO2 candle, and Test Method B describes that of a PbO2 sulfation plate. 1.3 These test methods provide a weighted average effective SO2 level for a 30-day interval. 1.4 The results of these test methods correlate approximately with volumetric SO2 concentrations, although the presence of dew or condensed moisture tends to enhance the capture of SO2 onto the candle or plate. 1.5 The values stated in SI units shall be regarded as the standard. The values given in brackets are for information only and may be approximate. Note 18212;It has been shown that the rate constant of the chemical reaction between SO2 and PbO2 is independent of the concentration of SO2 up to levels of 1000 ppm(v), if 15 % or less of the PbO2 has been reduced (1). 15 % of the PbO2 is equivalent to 11 to 12 mg of SO2/cm2 per day. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and he......

Standard Test Methods for Evaluation of Total Sulfation Activity in the Atmosphere by the Lead Dioxide Technique

ASTM D6306-98 室内空气中气态污染物用扩散控制无源检测器安置和使用的标准指南

1.1 This guide covers the placement and use of diffusion controlled monitors in the indoor atmosphere.

Standard Guide for Placement and Use of Diffusion Controlled Passive Monitors for Gaseous Pollutants in Indoor Air

ASTM D6345-98 空气中挥发性有机化合物活动性的集中的取样方法选择的标准指南

1.1 This guide provides assistance in the selection of active integrative sampling methods, in which the volatile organic analytes are collected from air over a period of time by drawing the air into the sampling device, with subsequent recovery for analysis. Where available, specific ASTM test methods and practices are referenced. 1.2 Guidance is provided for the selection of active sampling methods based either on collection of an untreated air sample (whole air samples) or selective sampling using sorbent concentration techniques that selectively concentrate components in air. Advantages and disadvantages of specific collection vehicles are presented. 1.3 This guide does not cover the use of cryogenically cooled field sampling devices used in some automated analysis systems. Detailed instructions for cryogenic recovery of compounds captured as whole air samples or thermally desorbed from sorbents are typically covered in standard methods for sample analysis and are beyond the scope of this guide. 1.4 Both thermal and solvent desorption techniques for sample recovery are discussed. 1.5 Organic compounds are classified on the basis of vapor pressure as very volatile, volatile, semivolatile and nonvolatile. Physical characteristics of many volatile organic compounds (VOCs) are provided to aid in selection of sampling techniques for VOC measurement. Semivolatile and nonvolatile organic compounds are defined in the guide to help guide users avoid misidentifying compounds that are not covered in this guide. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Guide for Selection of Methods for Active, Integrative Sampling of Volatile Organic Compounds in Air

ASTM D4765-98 工作场所大气中氟化物的标准试验方法

1.1 This test method covers the simultaneous collection and separate measurements of gaseous and particulate fluoride found in certain industrial workplaces. The gaseous inorganic fluorides collected are reported in terms of fluoride; the procedure is not applicable to the collection or analysis of other fluoride-bearing gases (for example, fluorocarbon or fluorosulfur compounds). This test method covers sample collection, preparation, and fluoride measurement. 1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Test Method for Fluorides in Workplace Atmospheres

ASTM E1979-98 铅的连续测定用涂料、尘埃和土壤的超声萃取以及大气取样的标准实施规范

1.1 This practice covers an ultrasonic extraction procedure for the extraction of lead from environmental samples of interest in lead abatement and renovation (or related) work, for analytical purposes. 1.2 Environmental matrices of concern here include dry paint films, settled dusts, soils, and air particulates. 1.3 Samples subjected to ultrasonic extraction are prepared for subsequent determination of lead by laboratory analytical methods. 1.4 This practice includes, where applicable, descriptions of procedures for sample homogenization and weighing prior to ultrasonic extraction. 1.5 The values stated in SI units are to be regarded as the standard. 1.6 This practice does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Practice for Ultrasonic Extraction of Paint, Dust, Soil, and Air Samples for Subsequent Determination of Lead

ASTM D6306-98(2003) 室内空气中气态污染物用扩散控制无源检测器安置和使用的标准指南

The objective of this guide is to provide guidance for the placement and use of passive monitors that when uniformly applied enables the user to eliminate many interferences in the sampling of indoor air. Since the analysis of the indoor environment by passive air monitors is influenced by many factors other than the method of sampling, efforts are made to minimize interfering factors and maintain the air at conditions typical of the measurement location within the vicinity of the passive air monitor. However, when performing diagnostic or special measurements, non-typical indoor air environment conditions may be desirable or required. Thus, the objectives of a sampling study may determine the conditions needed for sampling. Passive sampling provides for time integrated measurements. Passive monitors are usually placed in an indoor environment over a time period to obtain a cumulative sample; hence, interfering factors should be anticipated and eliminated where possible. Passive monitors often lack the sensitivity to measure short-term peak concentrations. With suitable instruction regarding placement of passive monitors, placement and retrieval of the monitors can be performed by unskilled personnel (for example, occupants).1.1 This guide covers the placement and use of diffusion controlled monitors in the indoor atmosphere.1.2 Diffusion controlled passive monitors within this guide include both area and personal monitors for use in residences, public buildings, offices, and other non-industrial workplaces and dwelling environments. A passive monitor is any air monitor that does not utilize electrical or mechanical power in order to supply air to the sorbent media or chemical reactant within the monitor and sample according to Fick's first law of diffusion.1.3 The purpose of this guide is to ensure uniformity of sampling within a variety of indoor environments and to facilitate comparison of results.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Guide for Placement and Use of Diffusion Controlled Passive Monitors for Gaseous Pollutants in Indoor Air

ASTM D4766-98(2003) 工场所大气中氯乙烯的标准试验方法(碳管法)

Vinyl chloride monomer is the starting material for the manufacture of poly(vinyl chloride) (PVC), which is used extensively in construction, electronics, packaging, and other industries. The vinyl chloride gas can escape during manufacturing, transportation, and polymerization stages. Residual monomer can also escape during subsequent fabrication processes. Vinyl chloride is a toxic and explosive hazardous material. Vinyl chloride is suspected to be a carcinogenic agent (4). The present OSHA standard for VCM is 1.0 ppm (v) with a 0.5-ppm (v) action level. The maximum length of operator exposure at 5 ppm (v) is 15 min.4 The method is made selective for vinyl chloride by choosing chromatograph columns that will separate vinyl chloride from other organic compounds in the sample. The method meets the federal requirements for monitoring workplace atmospheres in vinyl chloride and poly(vinyl chloride) production and fabrication processes.1.1 This test method describes the determination of vinyl chloride monomer (VCM) in workplace atmospheres using a modified charcoal tube method (see Practice D3686). 1.2 This procedure is compatible with low flow rate personal sampling equipment. It can be used for personnel or stationary monitoring. It cannot determine instantaneous fluctuations in concentration to detect maximum values. Alternative on-site procedures, such as gas chromatography or infrared spectrometry, must be used to measure fast-changing concentrations. 1.3 The range of this test method is from the limit of detection of approximately 0.01 to 100 ppm. 1.4 The sampling method provides a time-weighted average sample. 1.5 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For more specific precautionary statements, see Section 9 and Notes 2 and 4.

Standard Test Method for Vinyl Chloride in Workplace Atmospheres (Charcoal Tube Method)

ASTM D6345-98(2004)e1 空气中挥发性有机化合物活动性的集中的取样方法选择的标准指南

This guide provides a broad perspective on techniques that can be used by environmental managers for selecting VOC air monitoring methods. It summarizes various methods for measurement of VOC in air derived from a variety of sources and experiences and incorporates them into condensed guidelines. This guide provides a common basis for selecting methods for VOC measurement as well a discussion of the limitations of typical methods. This guide should be used during the planning stages of an air monitoring program along with other applicable guides and practices (for example, D 1357) to select ASTM or other appropriate methods.1.1 This guide provides assistance in the selection of active integrative sampling methods, in which the volatile organic analytes are collected from air over a period of time by drawing the air into the sampling device, with subsequent recovery for analysis. Where available, specific ASTM test methods and practices are referenced. 1.2 Guidance is provided for the selection of active sampling methods based either on collection of an untreated air sample (whole air samples) or selective sampling using sorbent concentration techniques that selectively concentrate components in air. Advantages and disadvantages of specific collection vehicles are presented. 1.3 This guide does not cover the use of cryogenically cooled field sampling devices used in some automated analysis systems. Detailed instructions for cryogenic recovery of compounds captured as whole air samples or thermally desorbed from sorbents are typically covered in standard methods for sample analysis and are beyond the scope of this guide. 1.4 Both thermal and solvent desorption techniques for sample recovery are discussed. 1.5 Organic compounds are classified on the basis of vapor pressure as very volatile, volatile, semivolatile and nonvolatile. Physical characteristics of many volatile organic compounds (VOCs) are provided to aid in selection of sampling techniques for VOC measurement. Semivolatile and nonvolatile organic compounds are defined in the guide to help guide users avoid misidentifying compounds that are not covered in this guide. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Guide for Selection of Methods for Active, Integrative Sampling of Volatile Organic Compounds in Air

ASTM D6209-98(2004) 环境空气中气态和颗粒多环芳香烃测定的标准试验方法(用气相色谱/质谱分析的背面吸着剂的滤膜的收集)

1.1 This test method specifies sampling, cleanup, and analysis procedures for the determination of polycyclic aromatic hydrocarbons (PAH) in ambient air.1.2 This test method is designed to collect both gas-phase and particulate-phase PAH and to determine them collectively.1.3 This test method is a high-volume sampling (100 to 250 L/min) method capable of detecting PAH at sub-nanograms per cubic metre (ng/m3) concentrations with sampling volumes up to 350 m3 of air.1.4 This test method has been validated for sampling periods up to 24 h.1.5 Precision and bias under normal conditions can be expected to be 35 to 50 %.1.6 This test method describes a sampling and analysis procedure for PAH that involves collection from air on a combination fine-particle filter and sorbent trap and subsequent analysis by gas chromatography/mass spectrometry (GC/MS).1.7 The range of this test method is approximately 0.05 to 1000 ng/m3 of air sampled.1.8 The values stated in SI units shall be regarded as standard.This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See also Section for additional safety precautions.

Standard Test Method for Determination of Gaseous and Particulate Polycyclic Aromatic Hydrocarbons in Ambient Air (Collection on Sorbent-Backed Filters with Gas Chromatographic/Mass Spectrometric Analysis)

ASTM D4766-98 工场所大气中氯乙烯的标准试验方法(碳管法)

1.1 This test method describes the determination of vinyl chloride monomer (VCM) in workplace atmospheres using a modified charcoal tube method (see Practice D3686). 1.2 This procedure is compatible with low flow rate personal sampling equipment. It can be used for personnel or stationary monitoring. It cannot determine instantaneous fluctuations in concentration to detect maximum values. Alternative on-site procedures, such as gas chromatography or infrared spectrometry, must be used to measure fast-changing concentrations. 1.3 The range of this test method is from the limit of detection of approximately 0.01 to 100 ppm. 1.4 The sampling method provides a time-weighted average sample. 1.5 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For more specific precautionary statements, see Section 9 and Notes 2 and 4.

Standard Test Method for Vinyl Chloride in Workplace Atmospheres (Charcoal Tube Method)

ASTM D6209-98e1 环境空气中气态和颗粒多环芳香烃测定的标准试验方法(用气相色谱/质谱分析的背面吸着剂的滤膜的收集)

1.1 This test method specifies sampling, cleanup, and analysis procedures for the determination of polycyclic aromatic hydrocarbons (PAH) in ambient air. 1.2 This test method is designed to collect both gas-phase and particular-phase PAH and to determine them collectively. 1.3 This test method is a high-volume sampling (100 to 250L/min) method capable of detecting PAH at sub-nanograms per cubic meter (ng/m3) concentrations with sampling volumes up to 350 m3 of air. 1.4 This test method has been validated for sampling periods up to 24 h. 1.5 Precision and bias under normal conditions can be expected to be +35 to 50%. 1.6 This test method describes a sampling and analysis procedure for PAH that involves collection from air on a combination fine-particle filter and sorbent trap and subsequent analysis by gas chromatography/mass spectrometry (GC/MS). 1.7 The range of this test method is approximately 0.05 to 1000 ng/m3 of air sampled. 1.8 The values stated in S1 units shall be regarded as standard. 1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the application.

Standard Test Method for Determination of Gaseous and Particulate Polycyclic Aromatic Hydrocarbons in Ambient Air (Collection on Sorbent-Backed Filters with Gas Chromatographic/Mass Spectrometric Analysis)

ASTM D6245-98(2002) 使用室内二氧化碳浓度评价室内空气质量和通风的标准指南

1.1 This guide describes how measured values of indoor carbon dioxide (CO2) concentrations can be used in evaluations of indoor air quality and building ventilation.1.2 This guide describes the determination of CO 2 generation rates from people as a function of body size and level of physical activity.1.3 This guide describes the experimentally-determined relationship between CO2 concentrations and the acceptability of a space in terms of human body odor.1.4 This guide describes the following uses of indoor CO2 concentrations to evaluate building ventilation-mass balance analysis to determine the percent outdoor air intake at an air handler, the tracer gas decay technique to estimate whole building air change rates, and the constant injection tracer gas technique at equilibrium to estimate whole building air change rates.1.5 This guide discusses the use of continuous monitoring of indoor and outdoor CO2 concentrations as a means of evaluating building ventilation and indoor air quality.1.6 This guide discusses some concentration measurement issues, but it does not include or recommend a method for measuring CO 2 concentrations.1.7 This guide does not address the use of indoor CO 2 to control outdoor air intake rates.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Guide for Using Indoor Carbon Dioxide Concentrations to Evaluate Indoor Air Quality and Ventilation

ASTM D6245-98 使用室内二氧化碳浓度评价室内空气质量和通风的标准指南

1.1 This guide describes how measured values of indoor carbon dioxide (CO2) concentrations can be used in evaluation of indoor air quality and building ventilation. 1.2 This guide describes the determination of CO2 generation rates from people as a function of body size and level of physical activity. 1.3 This guide describes the experimentally-determined relationship between CO2 concentrations and the acceptability of a space in terms of human body odor. 1.4 This guide describes the following uses of indoor CO2 concentrations to evaluate building ventilation-mass balance analysis to determine the percent outdoor air intake at an air handler, the tracer gas decay technique to estimate whole building air change rates, and the constant injection tracer gas technique at equilibrium to estimate whole building air change rates. 1.5 This guide discusses the use of continuous monitoring of indoor and outdoor CO2 concentrations as a means of evaluating building ventilation and indoor air quality. 1.6 This guide discusses some concentration measurement issues, but it does not include or recommend a method for measuring CO2 concentrations. 1.7 This guide does not address the use of indoor CO2 to control outdoor air intake rates. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Guide for Using Indoor Carbon Dioxide Concentrations to Evaluate Indoor Air Quality and Ventilation

ASTM D5281-98 在周围环境中,工作地点或室内环境中六价氯采集和分析的标准试验方法

1.1 This test method covers the collection and measurement of hexavalent chromium [CR(VI)] in ambient, workplace, or indoor atmospheres. 1.2 This test method collects and stabilizes atmospheric hexavalent chromium using an alkaline impinger buffer solution in a wet impingement sampling technique. Lead chromate [PbCrO4], generally considered poorly soluble in water, is soluble in the impinger solution up to 940 [mu]g/L as hexavalent chromium. 1.3 This test method measures hexavalent chromium using an ion chromatographic separation combined with a post separation reaction with a colorimetric reagent and photometric detection. 1.4 This test method is applicable in the range of 0.2 to 100 ng/m of hexavalent chromium in the atmosphere assuming 20 m of air sample. The range can be extended upwards by appropriate dilution. 1.5 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Test Method for Collection and Analysis of Hexavalent Chromium in Ambient Atmospheres