Effects of sampling strategies on estimates of annual mean herbicide concentrations in midwestern rivers
Article Abstract:
A study was conducted on the accuracy of 10 sampling strategies in predicting annual mean concentrations of the herbicides atrazine, alachlor and cyanazine in specific midwestern rivers. The accuracy of the strategies was assessed by comparing time-weighted annual mean herbicide concentrations with simulated annual mean concentrations using Monte Carlo simulations. Three strategies showed that more accurate representations of annual mean concentrations could be obtained by increasing sampling frequency during spring and early summer runoff and assuming no herbicide concentration during the late summer and winter months.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Comparative evaluation of diffusive and active sampling systems for determining airborne nicotine and 3-ethenylpyridine
Article Abstract:
Sampling systems that simultaneously measure 3-ethyenylpyridine and nicotine may be better tracers of environmental tobacco smoke than nicotine testing alone. The two collection systems most often used, acid-treated and XAD-4 resin filter samplers, were compared for both active and passive collection. A third method, a bisulfate-treated glass fiber filter, was found to be more precise in measuring both components of tobacco smoke. A small, unobtrusive passive sampling device with a Teflon wind shield and a bisulfate-treated filter was constructed for personal and area monitoring.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
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Evaluation of the Onda correlations for mass transfer with large random packings
Article Abstract:
A study was conducted on the use of Onda correlations in environmental applications, particularly in modern packings. Focus was restricted to random packing materials manufactured as individual pieces and only several centimeters in longest dimensions. Onda was found to be a good predictor of mass transfer for large random packings. However, it tended to unpredict mass transfer.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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- Abstracts: Kalman filter method for estimating organic contaminant concentrations in major Chesapeake Bay tributaries. Estimated annual loads of selected organic contaminants to Chesapeake Bay via a major tributary
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