EPA Method 552.2 - Surrogate Standard Back Catalog number: 30109 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 682921 Thifensulfuron-methyl, 100 µg/ml, Acetonitrile, Price on request 677971 Chlorpyrifos, 100 µg/ml, Toluene, 1ml Price on request 79151 Benzidine Price on request