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Comparison of methods for the concentration of suspended sediment in river water for subsequent chemical analysis

Environmental Science and Technology

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Abstract

Centrifugation, settling/centrifugation, and backflush-filtration procedures have been tested for the concentration of suspended sediment from water for subsequent trace-metal analysis. Either of the first two procedures is comparable with in-line filtration and can be carried out precisely, accurately, and with a facility that makes the procedures amenable to large-scale sampling and analysis programs. There is less potential for post-sampling alteration of suspended sediment-associated metal concentrations with the centrifugation procedure because sample stabilization is accomplished more rapidly than with settling/centrifugation. Sample preservation can be achieved by chilling. Suspended sediment associated metal levels can best be determined by direct analysis but can also be estimated from the difference between a set of unfiltered-digested and filtered subsamples. However, when suspended sediment concentrations (<150 mg/L) or trace-metal levels are low, the direct analysis approach makes quantitation more accurate and precise and can be accomplished with simpler analytical procedures.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Comparison of methods for the concentration of suspended sediment in river water for subsequent chemical analysis
Series title:
Environmental Science and Technology
Volume
20
Issue:
2
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
155
Last page:
160
Number of Pages:
6