| 塑胶（polyethylene)参考标准物质，符合RoHS指令
（ppm = mg/kg） ERM-EC680高浓度
ERM-EC680K低浓度 ERM-EC681K高浓度
ERM-EC681低浓度 ERM-EC680 | As | 30.9 ppm | | Br | 808 ppm | | Cd | 140.8 ppm | | Cl | 810 ppm | | Cr | 114.6 ppm | | Hg | 25.3 ppm | | Pb | 107.6 ppm | | S | 670 ppm | ERM-EC680K | As | 4.1 ppm | | Br | 96 ppm | | Cd | 19.6 ppm | | Cl | 102.2 ppm | | Cr | 20.2 ppm | | Hg | 4.64 ppm | | Pb | 13.6 ppm | | S | 76 ppm | | Sb | 10.1 ppm | ERM-EC681 | As | 3.93 ppm | | Br | 98 ppm | | Cd | 21.7 ppm | | Cl | 92.9 ppm | | Cr | 17.7 ppm | | Hg | 4.50 ppm | | Pb | 13.8 ppm | | S | 78 ppm | ERM-EC681K | As | 29.1 ppm | | Br | 0.77 ppm | | Cd | 137 ppm | | Cl | 0.8 ppm | | Cr | 100 ppm | | Hg | 23.7 ppm | | Pb | 98 ppm | | S | 0.63 ppm | | Sb | 99 ppm | | 
