EPA Method 502.2 Surrogate Standard Back Catalog number: 91704 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 680942 Oxytetracycline hydrochloride, 10 µg/ml, Methanol Price on request 677972 Chlorpyrifos-methyl, 100 µg/ml, Toluene, 1ml Price on request MBP-31 2,4',5-Trichloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane Price on request