EPA Method 525 - Perchlorinates Back Catalog number: 31029 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended C0879 4-Chloro-2-nitrobenzoic Acid, >98%, 25g Price on request 73935 4-Acetamidoantipyrine, 1000µg/ml in MeOH, 1ml Price on request L20018900IO PCB No. 189, 10µg/ml in Isooctane, 10ml Price on request