Tralomethrin, 100 µg/ml, Acetonitrile, 1ml

Tramadol-13C,d3 HCl, 100µg/ml in MeOH, 1ml

o,p'-DDT, 100µg/ml in MeOH, 1ml

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