Extraction Standard Solution, in nonane/6.8% toluene, 1,2ml

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

Nitrofen, 100 µg/ml, Acetonitrile, 1ml

1,2,4,5,8,9-Hexachloroundecane, 100µg/ml in Isooctane, 1ml