Methyl Arsonic Acid Disodium Salt (~40%), 250mg

1,2,3,4-Tetrachlorobenzene, 100mg

Sulfur Calibration Mixtures: Di-n-butyl sulfide in Light White Oil (less than 20mg/kg S) Unit : 10mL screw-capped bottle Light White Mineral Oil Heavy White Mineral Oil (20 cSt at 40°C) (70 cSt at 40°C)

1,2,4,6,7,8-Hexachlorodibenzofuran , 1.2ml x 50ug/ml, toluene