EPA Method 500 Series Internal Std #4 Back Catalog number: 30003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 94981 PCB Congener Mix #3 Price on request 676622 cis-3-(2,2-Dichlorovinyl)-2,2-dimethylcyclopropane Price on request DF-12367-S 1,2,3,6,7-Pentachlorodibenzofuran, 1.2ml x 50ug/ml, nonane Price on request