QC-21 - ICP Optical Back Catalog number: 50282 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended PN-21S 1,3,7-Trichloronaphthalene, 1.2mL x 50ug/mL, nonane Price on request 94212 525 Internal Standard Price on request 673779 2,4-DB-methyl ester, 100 µg/ml, Ethyl acetate, 5 Price on request