4,4'-Diamino-3,3'-dimethyldiphenylmethane, 100 µg/

Sulfur Calibration Mixtures: Di-n-butyl sulfide in Heavy 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)

Nitrite (NO2-) as N, 100µg/ml in Water, 100ml

bis(2-Ethylhexyl) phthalate