COD Calibration Standard Back Catalog number: 50434 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-236-S 2,3,6-Trichlorodibenzofuran, 1.2ml x 50ug/ml, nonane Price on request 30064R EPA Method 502/524 High Conc VOC Mix #7 Price on request 59620 Total Residual Free Chlorine Price on request