Chlorpyrifos exposure and biological monitoring among manufacturing workers

C. J. Burns, D. Garabrant, J. W. Albers, S. Berent, B. Giordani, S. Haidar, R. Garrison, R. J. Richardson

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Aim: To use biological monitoring data to evaluate the soundness of job based exposure classifications. Methods: The authors studied 52 chlorpyrifos manufacturing workers and 60 referent workers to compare chlorpyrifos exposure estimations from job titles and work areas to urinary excretion of 3,5,6 trichloro-2-pyridinol (TCP), a metabolite of chlorpyrifos. Work history records and industrial hygiene monitoring data were used to establish cumulative interim exposure. Chlorpyrifos exposure during the study year was assessed biologically by urinary excretion of TCP. Results: Exposure as measured by three urinary TCP samples was significantly higher among the chlorpyrifos workers (188 μg/l) than it was for the referent subjects (7 μg/l). Urinary TCP also correlated well with specific exposure categories of negligible (0.73-1.98 mg/m3 days), low (1.99-4.91 mg/m3 days), and moderate (4.92-15.36 mg/ m3 days). The weighted Kappa coefficient was 0.80 (95% CI 0.72 to 0.87) for the mean TCP over the study period. Conclusions: The estimates of chlorpyrifos exposure based on job classifications and industrial hygiene measurements were significantly related to urinary TCP excretion, indicating that the ambient estimates are useful for providing exposure estimates among chlorpyrifos manufacturing workers.

Original languageEnglish
Pages (from-to)218-220
Number of pages3
JournalOccupational and Environmental Medicine
Issue number3
StatePublished - Mar 2006


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