Nitrate & Nitrite as N Back Catalog number: 54521 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 54355 Color Price on request 66149 2,2',3,4',5',6-Hexachlorobiphenyl (149) Price on request 2663.10-100 Toxaphene, 100µg/mL, Solvent-c.hexane or ac.nitrile, Unit 1mL, # of units-1, Cas.no. 8001-35-2 Price on request