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Interlaboratory study for the polychlorinated naphthalenes (PCNs): phase 1 results
1ARQM Atmospheric Environment Service, Environment Canada, 4905 Dufferin St., Downsiew, Toronto, Ont., Canada M3H 5T4. tom.harner@ec.gc.ca
Chemosphere
|March 5, 2003
Summary
Interlaboratory studies on polychlorinated naphthalenes (PCNs) show consistent total PCN quantification but high variability for individual homologs and congeners. Further research and reference materials are needed for accurate PCN analysis.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- Polychlorinated naphthalenes (PCNs) are persistent organic pollutants requiring accurate quantification.
- Interlaboratory variability in PCN analysis can impact environmental monitoring and risk assessment.
Purpose of the Study:
- To assess the consistency of reported polychlorinated naphthalene (PCN) concentrations across different laboratories.
- To investigate the impact of various quantification methodologies, instrumentation, and standards on PCN analysis.
Main Methods:
- Nine laboratories from seven countries participated in the study.
- Participants quantified individual PCN homolog groups and selected congeners in two Halowax 1014 derived test solutions.
- Summation operator PCN (total PCNs 2-8 chlorinated) was also quantified.
Main Results:
- The mean of reported summation operator PCN values were within 15% of known concentrations.
- A relative standard deviation of 11% was observed for total PCN values among laboratories.
- Variability among laboratories ranged from 20-40% for individual PCN homologs and congeners.
Conclusions:
- While total PCN quantification shows good consistency, significant variability exists for individual PCN homologs and congeners.
- The findings highlight the need for further interlaboratory studies and the development of certified reference materials for PCN analysis.
- Future studies will incorporate control materials and environmental matrices to improve PCN analysis accuracy.