Potassium (K) Back Catalog number: 57119 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 90605 EPA Method 8141/1657 Analytes Price on request 54258 Nitrate (NO3-) as N Price on request 9393.24-50UG 10:2 Di-PAPS, neat, Solvent-neat, Unit ca. 50 µg, # of units-1, Cas.no. 1895-26-7 Price on request