EPA 1620 Standard 4 Back Catalog number: 53142 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 13432-AN5 DNPH - Mix 4, 100µg/ml in Acetonitrile, 5ml Price on request C-189N 2,3,3',4,4',5,5'-Heptachlorobiphenyl, 5mg Price on request 97817 4-n-Nonylphenol Price on request