Potassium (K), 1000µg/ml in 2%-HNO3/Water, 100ml Back Catalog number: 57019 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended DF-IS-G40 Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request 678466 Paraoxon-ethyl, 10 µg/ml, Acetonitrile, 10ml Price on request 58068 Erbium (Er) Price on request