Copper (Cu) - 7 PPM Back Catalog number: 50744 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8101.10-50-IO 1,2,3,4,6,7-Hexabromonaphthalene, 50µg/mL, Solvent-Isooctane, Unit 1mL, # of units-1, Cas.no. Price on request 675999 Guaiacol, 250mg Price on request 675161 Chlorthal-dimethyl, 10 µg/ml, Cyclohexane, 10ml Price on request