Ammonia as (NH4+) Back Catalog number: 54112 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended 54139 Sulfide (S), 1000 µg/mL in Water, 3 x 20ml Price on request 511-946 1000 ppmC standard KHP, 100ml Price on request SCP150-100-255 CONOSTAN 1000ppm Standard, Mn, 50g Price on request