EPA Method 505/507 - Pesticide Standard Back Catalog number: 91936 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 90605 EPA Method 8141/1657 Analytes Price on request 81403 Chlorpyrifos, 1000µg/ml in Hexane 1ml Price on request 52155 CLP Calibration Standard Price on request