Perfluoro-n-[1,2-13C2]dodecanoic acid, 50µg/ml in MeOH, 1,2ml

1,4-Phenylenediamine, 100mg

4-Chlorobiphenyl (3)

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)