EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79155 o-Phenylphenol Price on request 673710 Tolclofos-methyl, 100 µg/ml, Ethyl acetate, 5ml Price on request 677973 Diazinon, 100 µg/ml, Toluene, 1ml Price on request