Phthalic acid, bis-methylglycol ester, certified, 0.25g

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)

Dimethoate, 10.0 µg/ml, Acetonitrile, 10ml

o-Xylene, 100µg/mL in MeOH, 1ml