EPA Method 8021B Internal Standard Back Catalog number: 19394 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended USP1645006 Testolactone CIII, 125mg Price on request MBP-153 2,2',4,4',5,5'-Hexachloro[13C12]biphenyl, 1.2ml x 50ug/ml, nonane Price on request ACQ-WH20-115 Ethanol standard in whole blood,2.0g/L,whole blood, 1.5mL Price on request