Formaldehyd-DNPH, 100mg

2-Methylfuran, 1000mg

1,3,4,6,8-Pentachloro[13C12]dibenzofuran, 1.2ml x 50ug/ml, toluene

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)