Selenium (Se) Back Catalog number: 56034 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-1234678-S 1,2,3,4,6,7,8-Heptachlorodibenzofuran , 1.2ml x 50ug/ml, nonane Price on request 91837 WS Disinfection By-Products - Cal Check Price on request 10052.23-50-AN JWH-073 COOH-d4, 50µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. Price on request