EPA Method 525 - PCB Standard Back Catalog number: 19063 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 15900-4938-100AN5 1,2,4-Triazole, 100µg/ml in Acetonitrile, 5ml Price on request 79548 Disulfoton sulfone Price on request 74085 Guanylurea, 1000µg/ml in Water, 1ml Price on request