EPA Method 524 & 624 - Internal Standard

2,4,5-T-methyl ester, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 1928-37-6

2,3,6,7-Tetrachlorobiphenylene, 1.2ml x 1x10-4M, dimethylsulfoxide

2,4'-DDE, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 3424-82-6