Copper - 20 PPM Back Catalog number: 50594 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70311 1-Chloronaphthalene, 1000µg/ml in MeOH, 1ml Price on request 71874 2-Isopropylnaphthalene Price on request 60009 High Concentration Mix #2 Price on request