Chloroform-13C,2000 µg/mL,MeOH,1mL,

d2 C29 alpha alpha alpha (20R)-Ethylcholestane, 100µg/mL in Isooctane, 10 x 1ml

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)

4,4’-Methoxychlor