|The 1993 QUASIMEME laboratory-performance study: chlorobiphenyls in fish oil and standard solutions|
|Wells, D.E.; de Boer, J. (1994). The 1993 QUASIMEME laboratory-performance study: chlorobiphenyls in fish oil and standard solutions. Mar. Pollut. Bull. 29(4-5): 174-84|
|In: Marine Pollution Bulletin. Macmillan: Oxford. ISSN 0025-326X, more|
Bioaccumulation; Chemical analysis; Chlorinated hydrocarbons; Environmental monitoring; Fish; Fish oils; Information handling; Information services; Information systems; Laboratories; Marine environment; Marine pollution; Performance evaluation; Pollution monitoring; Quality assurance; Quality control; Standards; Statistical analysis; Water pollution; Marine
A laboratory-performance study has been undertaken to improve the measurement of chlorobiphenyls in marine biota as part of the QUASIMEME (EU--Measurement and Testing) project. Fifty-two laboratories were invited to participate, of which 47 returned data on nine congeners in iso-octane solution and in cod liver oil. The concentration of CBs ranged between 7 and 124 mu g/kg in the oil. The robust statistical analysis gave a within-laboratory relative standard deviation from 5.7 to 14.4% and between-laboratory relative standard deviation from 17.6 to 37%. Over 60% of all errors were due to inaccurate calibration, poor GC separation and non-analytical mistakes by 13 of the laboratories.