EPA Method 552.1 - Surrogate Standard Back Catalog number: 31057 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 94743 o-Aminoazo-p-toluene Price on request 685688 Acetone-2,4-DNPH, 1000μg/ml in Acetonitrile, 5ml Price on request C17945100-5ML m-Xylene, certified, 5ml Price on request