EPA Method 8270 Additional Analytes Back Catalog number: 93678 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 672963 Metronidazole, 250mg Price on request 56161 Hexavalent Chromium (Cr 6+) Price on request 2911.17-100-ME Sodium p-n-undecylbenzenesulfonate, 100µg/mL in MeOH, 1ml Price on request