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Adsorption -- desorption using a batch equilibrium method

Author: Organisation for Economic Co-operation and Development.
Publisher: [Paris] : OECD Publishing, 2000.
Series: OECD Guidelines for the Testing of Chemicals., Section 1,, Physical-Chemical properties.
Edition/Format:   eBook : Document : International government publication : EnglishView all editions and formats
Summary:
This Test Guideline is aimed at estimating the adsorption/desorption behaviour of a chemical on different soil types. The goal is to obtain a sorption value which can be used to predict partitioning under a variety of environmental conditions; to this end, equilibrium adsorption coefficients for a chemical on various soils are determined as a function of soil characteristics (organic carbon, clay content, soil  Read more...
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Material Type: Document, Government publication, International government publication, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Organisation for Economic Co-operation and Development.
ISBN: 9789264069602 9264069607
OCLC Number: 704441626
Description: 1 online resource (44 pages) : illustrations.
Series Title: OECD Guidelines for the Testing of Chemicals., Section 1,, Physical-Chemical properties.
Other Titles: 106, adopted 21st January 2000
Responsibility: Organisation for Economic Co-operation and Development.

Abstract:

This Test Guideline is aimed at estimating the adsorption/desorption behaviour of a chemical on different soil types. The goal is to obtain a sorption value which can be used to predict partitioning under a variety of environmental conditions; to this end, equilibrium adsorption coefficients for a chemical on various soils are determined as a function of soil characteristics (organic carbon, clay content, soil texture, and pH). The test comprises three tiers. The tier 1 is the preliminary study, the tier 2 is the screening test (in 5 soils) and the tier 3 is the determination of Freundlich adsorption isotherms or the study of desorption by means of desorption kinetics/Freundlich desorption isotherms, as appropriate. Two methods are possible for analyse: the indirect method and the direct method. The indirect method consists of the adjunction of the test substance to soil samples, the agitation of the mixture for an appropriate time, the analysis of the aqueous phase after centrifugation and the filtration of the soil suspension. The amount of test substance adsorbed on the soil sample is calculated as the difference between the amount of test substance initially present in solution and the amount remaining at the end of the experiment. The direct method is recommended when the difference in the solution concentration of the substance cannot be accurately determined.

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