An improved elutriation technique for the bioassessment of sediment contaminants

A proposed improved method for sediment elutriate preparation to realistically determine pollutant bioavailability advocated rotary tumbling in a cycle of 3-4 rpm to achieve adequate sediment-water mixing. The mixing efficiency of the rotary tumbler was compared with that of the compressed air, wris...

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Bibliographic Details
Published in:Hydrobiologia 1989-12, Vol.188-189 (1), p.619-631
Main Authors: Daniels, SA, Munawar, M, Mayfield, C I
Format: Article
Language:English
Subjects:
Chlorella vulgaris
Freshwater
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Summary:A proposed improved method for sediment elutriate preparation to realistically determine pollutant bioavailability advocated rotary tumbling in a cycle of 3-4 rpm to achieve adequate sediment-water mixing. The mixing efficiency of the rotary tumbler was compared with that of the compressed air, wrist-action shaker, and reciprocal shaker methods using sediment to water ratios of 0:1, 1:20, 1:10 and 1:4 tested during 0.5, 1.0, 24 and 48 h elution periods. Elutriate evaluations based on changes in pH, conductivity, dissolved solids, trace metal and organic analysis, and carbon-14 bioassays using Chlorella vulgaris, indicated that rotary tumbling produced the most consistent bioassay verifiable data and was the most efficient procedure when used with 1:4 sediment-water mixtures during a 1 h elution period.
ISSN:0018-8158
1573-5117
DOI:10.1007/BF00027830