EPA 1620 Standard 3 Back Catalog number: 52141 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 90593 Aroclor 1221 Price on request 683839 4,4'-Dichlorobenzophenone, 100 µg/ml, Acetonitril Price on request DF-124678-S 1,2,4,6,7,8-Hexachlorodibenzofuran , 1.2ml x 50ug/ml, toluene Price on request