Initial Check Verif. Standard 4, in 4%HNO3, 100ml

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)

Barban

Sodium bis(perfluorooctyl)phosphinate, 50µg/ml in MeOH, 1,2ml