EPA 1620 Standard 2 Back Catalog number: 52140 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 674644 Benzyldimethyloctadecylammonium chloride, 100mg Price on request DFP-SS-A10 Mass-Labelled PCDD & PCB Sampling Spike Solution, 1.2ml, nonane Price on request MET-12279A-250MG Monodesmethyl Isoproturon, 250mg Price on request