Fenthion-sulfone, 100 µg/ml, Acetonitrile, 5ml

1,3-Diphenylguanidine, >98%, 25g

2,2',3,4,5',6-Hexachlorobiphenyl ,100 µg/mL,isooctane,1mL,

SDWA UV 254 Absorbance/ DOC