EPA Method 548 Analyte Back Catalog number: 30048 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 50402 Nitrite as (NO2-) Price on request 11634.16-250MG Ampicillin,neat,neat,250mg, Price on request 11064.12-K-MEX2 2,6-Diisopropylphenol-d18,1000 µg/mL,MeOH,1mL, Price on request