Ammonium Standard: NH4+, 1000µg/ml in Water, 100ml Back Catalog number: VHG-INH41K-100 Availability: In the manufacturer's stock Price on request - + Recommended PN-66S 1,2,3,4,6,7-Hexachloronaphthalene, 50µg/ml in nonane, 1,2ml Price on request EPA-1668CS3 Calibration Verification Solution, 500ul, nonane Price on request 673811 Imazalil, 100mg Price on request