Ammonium Standard: NH4+, 1000µg/ml in Water, 100ml Back Catalog number: VHG-INH41K-100 Availability: In the manufacturer's stock Price on request - + Recommended 73187 Triflumizole Price on request 35004 EPA Method 502.2/524.2 Volatile Standard Price on request 92051 Phenanthrene Price on request