Ammonia as (NH4+) Back Catalog number: 54112 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended 54506 Sulfate (SO4-2), 1000µg/ml in Water, 500ml Price on request N-11940-100MG Ethylmercuric chloride(Technical), 100mg Price on request 5190-8325 Zinc, 1000ug/ml, 100ml 25,92 €