Internal Standard Solution, 1.2ml, toluene

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

4-tert-Octylphenol, 100µg/ml in MeOH, 1ml

Sodium (Na), 1000µg/ml in Water, 100ml