Compositing and Storage of Air and Wastewater Samples
Publication: Journal of Environmental Engineering
Volume 125, Issue 4
Abstract
The performance of a field study to determine whether any of the 14 New York City water pollution control plants are major sources of air pollution required sampling and the analysis of a large number of samples. To reduce the number of samples for analysis and address the associated storage concerns of the analytical laboratories, the experimental design called for compositing air and wastewater samples, and for investigating the stability of wastewater samples. This paper addresses the quality control issues associated with the compositing and stability components of the experimental design. The study tested the hypothesis that compositing techniques used for air and wastewater sampling lead to results that are not unlike those obtained by conventional grab sampling. The study also tested whether wastewater samples stored under proper laboratory conditions remain stable for a period longer than the conventionally accepted storage period of 2 weeks. Statistical analyses demonstrated that the hypotheses tested cannot be rejected and, consequently, compositing techniques employed in this study are equivalent to conventional grab sampling and the storage period of samples can be extended beyond the accepted 2 week period.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 125 • Issue 4 • April 1999
Pages: 360 - 371
History
Published online: Apr 1, 1999
Published in print: Apr 1999
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