Ammonia as (NH4+) Back Catalog number: 54112 Manufacturer: ABSOLUTE STANDARDS Availability: 3 weeks Price on request - + Recommended 54503 Nitrate (NO3-) as N, 1000µg/mL in Water, 500ml Price on request 5190-8325 Zinc, 1000ug/ml, 100ml 646,12 Kč VHG-V21-30-100 V21 Wear Metals Standard: 30µg/g in Hydrocarbon Oil, 100g Price on request