EPA Method 507 Nitrogen Phosphorus Pesticide Back Catalog number: 31882 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended MDET-MXA Mass-Labelled DDT & Related Compound Mix, 2µg/ml in Nonane, 1,2ml Price on request 676446 Prochloraz Metabolite BTS40348, 10mg Price on request 677301 Caffeine, 100 µg/ml, Methanol, 1ml Price on request