Ammonia as (NH4+) Back Catalog number: 54112 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended E4203-500ML FE4203 Potassium Alc AAS 1g/L ,500LPF Price on request 54506 Sulfate (SO4-2), 1000µg/ml in Water, 500ml Price on request E4104-100ML FE4104 Arsenic AAS conc 10g/L ,100LPF Price on request