Initial Check Verif. Standard 4, in 4%HNO3, 100ml

2,3,4,5-Tetrachloro[13C12]diphenyl ether, 1.2ml x 50ug/ml, nonane

Ondansetron,neat,neat,10mg,

D10-N-Nitrosodiethylamine, 100µg/ml in MeOH, 5ml