TCEP, 100 µg/ml, Methanol, 5ml

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

PCB No. 32, 100µg/ml in Isooctane, 1ml

Salicylic acid-d4 (3,4,5,6-d4)