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

1,4-Dinitrosopiperazine-d8, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 69340-07-4

2,3',4,6-Tetrachlorobiphenyl

Perfluoro-n-[1,2-13C2]undecanoic acid, 1.2ml x 50ug/ml, methanol