2,4-Dimethylphenol, 100 µg/ml, Methanol, 5ml

Nitrite (NO2-) as N

Cadusafos, 100µg/ml in Acetonitrile, 1ml

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