EPA Method 507 - Internal Standard Back Catalog number: 19031 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 90125R Aroclor 1232 Price on request 680120 Isopropylbenzene, 500mg Price on request 680516 2-Hydroxy-propoxycarbazone, 100 µg/ml, Acetonitri Price on request