EPA Method 508 Surrogate Standard Back Catalog number: 19042 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675405 4-Chlorophenol, 10 µg/ml, Methanol, 10ml Price on request 680861 Diclofenac sodium, 100 µg/ml, Methanol, 1ml Price on request 71291 2,3,6-Trimethylnaphthalene Price on request