17?,18?(H),21ß(H),17-methyl-28-norhopane,neat,neat,ca. 5 µg,

Ethephon,neat,neat,250mg,

Thiodicarb, 250mg

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)