EPA 8240B Calibration Standard Back Catalog number: 98430 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10448.12-K-IO 4,4'-Diaminobiphenyl-d8 (Rings-d8) Price on request DF-IS-F200 Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request 97861 Aldehyde-DNPH Solution Price on request