EPA 1620 Standard 2 Back Catalog number: 53140 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-1238-S 1,2,3,8-Tetrachlorodibenzofuran, 1.2ml x 50ug/ml, nonane Price on request 72923 L-Cystine Price on request 92196 Pesticide Mix B + Surrogates Price on request