Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Presence of organophosphorus pesticide oxygen analogs in air samples.

Authors
Armstrong-JL; Fenske-RA; Yost-MG; Galvin-K; Tchong-French-M; Yu-J
Source
Atmos Environ 2013 Feb; 66:145-150
NIOSHTIC No.
20043660
Abstract
A number of recent toxicity studies have highlighted the increased potency of oxygen analogs (oxons) of several organophosphorus (OP) pesticides. These findings were a major concern after environmental oxons were identified in environmental samples from air and surfaces following agricultural spray applications in California and Washington State. This paper reports on the validity of oxygen analog measurements in air samples for the OP pesticide, chlorpyrifos. Controlled environmental and laboratory experiments were used to examine artificial formation of chlorpyrifos-oxon using OSHA Versatile Sampling (OVS) tubes as recommended by NIOSH method 5600. Additionally, we compared expected chlorpyrifos-oxon attributable to artificial transformation to observed chlorpyrifos-oxon in field samples from a 2008 Washington State Department of Health air monitoring study using non-parametric statistical methods. The amount of artificially transformed oxon was then modeled to determine the amount of oxon present in the environment. Toxicity equivalency factors (TEFs) for chlorpyrifos-oxon were used to calculate chlorpyrifos-equivalent air concentrations. The results demonstrate that the NIOSH-recommended sampling matrix (OVS tubes with XAD-2 resin) was found to artificially transform up to 30% of chlorpyrifos to chlorpyrifos-oxon, with higher percentages at lower concentrations (<30 ng m -3) typical of ambient or residential levels. Overall, the 2008 study data had significantly greater oxon than expected by artificial transformation, but the exact amount of environmental oxon in air remains difficult to quantify with the current sampling method. Failure to conduct laboratory analysis for chlorpyrifos-oxon may result in underestimation of total pesticide concentration when using XAD-2 resin matrices for occupational or residential sampling. Alternative methods that can accurately measure both OP pesticides and their oxygen analogs should be used for air sampling, and a toxicity equivalent factor approach should be used to determine potential health risks from exposures.
Keywords
Air-sampling; Organo-phosphorus-compounds; Organo-phosphorus-pesticides; Pesticides; Pesticides-and-agricultural-chemicals; Toxins; Agricultural-industry; Agriculture; Agricultural-chemicals; Monitoring-systems; Adsorbents; Analytical-processes; Chemical-composition; Chemical-properties; Analytical-methods; Environmental-contamination; Air-sampling-techniques; Measurement-equipment; Equipment-reliability; Laboratory-testing; Author Keywords: Air monitoring; Exposure; Organophosphorus pesticides; Oxon; Toxicity equivalent concentration; XAD resin
Contact
Jenna L. Armstrong, Department of Environmental and Occupational Health Sciences, University of Washington School of Public Health, Seattle, WA 98105
CODEN
AENVEQ
CAS No.
7782-44-7; 2921-88-2
Publication Date
20130201
Document Type
Journal Article
Email Address
jennaa@uw.edu
Funding Type
Grant
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008433
ISSN
1352-2310
Source Name
Atmospheric Environment
State
WA
Performing Organization
University of Washington
TOP