EPA Method 551.1 Performance Check Sol’n

Butachlor, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 23184-66-9

Isofenphos-methyl, 50mg

2,2,3,5-Tetrachlorobiphenyl (BZ-44)