G15 有机化工原料综合 标准查询与下载

ISO 2519:1974 工业用己二醇.试验方法一览

Hexylene glycol for industrial use; List of methods of test

ISO 2520:1974 工业用磷酸三甲酚酯 试验方法一览表

Specifies the sampling, the determination of the density at 20 0C, of the water content, of the acidity to phenol red, of apparent free phenols content and the measurement of colour in Hazen units.

Tritolyl phosphate for industrial use; List of methods of test

ISO 2521:1974 工业用磷酸三甲酚酯 用酚红为指示剂测定酸度 容量法

Specifies the titration of any acidity present in an ethanolic solution with standard volumetric sodium hydoxide solution in the presence of phenol red as indicator. The end point of the titration corresponds to the formation of the salt Na2 HPO4 .

Tritolyl phosphate for industrial use; Determination of acidity to phenol red; Volumetric method

ISO 2523:1974 工业用己二酸酯类 试验方法一览表

Adipate esters for industrial use; List of methods of test

ISO 2524:1974 工业用己二酸酯类 热处理后色度的测定

Adipate esters for industrial use; Measurement of colour after heat treatment

ISO 2525:1974 工业用己二酸酯类 用酚酞为指示剂测定酸度 容量法

Adipate esters for industrial use; Determination of acidity to phenolphthalein; Volumetric method

ISO 2526:1974 工业用己二酸酯类 灰分的测定 重量法

Adipate esters for industrial use; Determination of ash; Gravimetric method

ISO 2527:1974 工业用己二酸酯类 酯含量的测定 容量法

Adipate esters for industrial use; Determination of ester content; Volumetric method

ISO 2888:1973 工业用糠醛 用酚酞为指示剂测定酸度 容量法

Pretreatment of the water used, freshly boiled and cooled, by neutralization by addition of the standard volumetric sodium hydroxide solution or sulphuric acid solution as required. Addition of the test portion and titration with the standard volumetric sodium hydroxide solution in presence of phenolphthalein as indicator until the apperance of a pale pink colour.

Furfural for industrial use; Determination of acidity to phenolphthalein; Volumetric method

ISO 2757:1973 工业用1,2,4-三氯苯 试验方法一览表

1,2,4-Trichlorobenzene for industrial use; list of methods of test

ISO 2887:1973 工业用仲丁醇、甲乙酮、异丁基甲基酮、异戊基乙基酮、双丙酮醇和己二醇 用酚酞为指示剂测定酸度 容量法

Lays down the treatment of a test portion by dilution with water (or with ethanol or propan-2-ol if the sample is not completely soluble in water) and removal of carbon dioxide by passing a strem of nitrogen through the solution. The determination is carried out by titration with a standard volumetric sodium hydroxide solution using phenolphthalein as indicator. The nitrogen used shall be free from ammonia and carbon dioxide.

secButyl alcohol, methyl ethyl ketone, isobutyl methyl ketone, isoamyl ethyl ketone, diacetone alcohol and hexylene glycol for industrial use; Determination of acidity to phenolphthalein; Volumetric method

ISO 2755:1973 工业用1,1,1-三氯乙烷 试验方法一览表

Specifies the sampling, the determination of distillation characteristics, of the density at 20 0C, of residue on evaporation, of the water content, of the acidity and the measurement of colour in Hazen units. Has also been approved by the IUPAC.

1,1,1- Trichloroethane for industrial use; List of methods of test

ISO 2752:1973 工业用尿素 有甲醛时,pH值变化的测定 电位滴定法

Specifies the principle of measurement, at (20 0.5) 0C, of the quantity of 0.01 N sodium hydroxide standard volumetric solution required to take the pH of a solution containing 50 g of sample in 100 ml of water to a pH of 8.3 after addition of formaldehyde. Has also been approved by the IUPAC.

Urea for industrial use; Measurement of the variation of pH in the presence of formaldehyde; Potentiometric method

ISO 2753:1973 工业用尿素 水含量的测定 卡尔·费休法

Specifies the manner in which this method is to be applied in a reaction of any water present in urea with a solution of iodine and sulphur dioxide in a mixture of pyridine and methanol (Karl Fischer reagent). This reagent is first standadized by titration with a precisely known mass of water. The end point of the reaction is read by the direct visual or direct electrometric method. The method has also been approved by the IUPAC.

Urea for industrial use; Determination of water content; Karl Fischer method

ISO 2754:1973 工业用尿素 缩二脲含量的测定 光度法

Applicable to the determination in the presence of ammoniacal salts less than 15 mg in the aliquot amount taken for the determination. In the presence of quantities exceeding 15 mg the ammoniacal nitrogen shall be removed by a cation exchange resin because these salts interfere with the determination. The principle of the reaction consists in formation of a violet-red complex between allophanic acid amide (H2 N.CO.NH.CO.NH2 ) and copper sulphate in the presence of an alkaline solution of potassium sodium tartrate. Photometric measurement at a wavelength of about 550 nm. Has also been approved by the IUPAC.

Urea for industrial use; Determination of biuret content; Photometric method

ISO 2756:1973 工业用六氯苯 试验方法一览表

Specifies the sampling, the determination of the distillation characteristics subjected to the modifications appropriate for this product, of the water content, of the density at 20 0C and of the crystallizing point. Has also been approved by the IUPAC.

Hexachlorobenzene for industrial use; list of methods of test

ISO 2497:1973 工业用甲乙酮 试验方法一览表

Specifies the sampling, the determination of distillation characteristics, of the density at 20 0C, of residue on evaporation on a water bath, of the water content, of alcoholic impurities, of the acidity to phenolphthalein, the examination of residual odour and the measurement of colour in Hazen units.

Methyl ethyl ketone for industrial use; List of methods of test

ISO 2496:1973 工业用仲丁醇 试验方法一览表

Specifies the sampling, the determination of distillation characteristics, of residue on evaporation, of the acidity to phenolphthalein and the measurement of colour in Hazen units. The butan-2-ol sample is stored in a dark coloured, glass-stoppered bottle of such a size that it is nearly filled by the sample.

secButyl alcohol for industrial use; List of methods of test

ISO 2749:1973 工业用尿素 常规浓度(100 g/L)尿素溶液pH值的测定 电位滴定法

Describes the measurement of a solution of a test sample by means of a pH meter fitted with one glass electrode and one calomel electrode. The pH meter has a sensitivity of 0.05 pH units. The calibration of the pH meter is carried out at (20 0.5) 0C by means of buffer solutions. The method has also been approved by the IUPAC.

Urea for industrial use; Measurement of the pH of a solution of urea of conventional concentration (100 g/l); Potentiometric method

ISO 2751:1973 工业用尿素 缓冲系数的测定 电位滴定法

Applicable to solutions of conventional concentration. The principle consists in measurement, at (20 0.5) 0C, of the quantity of 0.05 N acid solution required to effect a pH change from 8 to 6 for a solution containing 100 g of urea in 1000 ml of solution. For the measurement a pH meter is used fitted with a glass electrode and a calomel electrode. The method has also been approved by the IUPAC.

Urea for industrial use; Determination of the buffer coefficient; Potentiometric method