Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane

1,1-Dichloro-2,2-bis[4-chloro(13C6)phenyl]ethene, 1.2mL x 100ug/mL, nonane

WS Disinfection By-Products - Cal Check 4

2,3,6,7-Tetrachloroxanthene , 1.2ml x 50ug/ml, toluene