EPA Method 507 - Performance Check Solution Back Catalog number: 19130 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 57381 Thallium (Tl) Price on request NK-ST-B4 Native PCDD/PCDF Solution/Mixture, 1.2ml, nonane Price on request 8878.8-500MG Cyclooctane-d16, neat, Solvent-neat, Unit 500mg, # of units-1, Cas.no. 92204-03-0 Price on request