EPA 1620 Standard 1 Back Catalog number: 52139 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 59611 IC Anions Cal Std - COA Level 3 Price on request 675984 Diquat and Paraquat Mix 1, 1000 µg/ml, Water, 1m Price on request 675736 Acibenzolar-S-methyl, 100 µg/ml, Ethyl acetate, Price on request