Ammonium Standard: NH4+, 1000µg/ml in Water, 100ml Back Catalog number: VHG-INH41K-100 Availability: In the manufacturer's stock Price on request - + Recommended DF-IS-J100 Mass-Labelled PCDD Internal Standard Solution, 1.2ml, nonane Price on request 676663 Isophorone, 1ml Price on request L17303300AL Terbuthylazine-desethyl-2-hydroxy, 10µg/ml in Acetonitrile, 10ml Price on request