Selenium (Se) Back Catalog number: 57134 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2837.4-50-ME Perfluorobutyramide, 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 662-50-0 Price on request 2031.12-50-NN 2,7-Dichlorodibenzo-p-dioxin,50 µg/mL,n-nonane,1mL, Price on request 79159 N-Nitrosodimethylamine Price on request