Ammonium Standard: NH4+, 1000µg/ml in Water, 100ml Back Catalog number: VHG-INH41K-100 Availability: In the manufacturer's stock Price on request - + Recommended 57014 Silicon (Si), 1000µg/ml in 2%-HNO3/Water, 100ml Price on request 96510 Alprazolam-D5 Price on request 72451 Flumetsulam Price on request