Caffeine, 1000µg/ml in MeOH, 1ml

2,2',3,3',4',5-Hexachloro-4-biphenylol, 1.2ml x 50ug/ml, nonane

2,2',3,3'-Tetrachlorobiphenyl ,100 µg/mL,isooctane,1mL,

alpha-Endosulfan-d4 (1,1,5,5-d4),100 µg/mL,n-nonane,1mL,