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Title:
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Verificatie van chemische test-methoden voor de beoordeling vanimmobilisaten
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Author(s):
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Published by:
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Publication date:
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ECN
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1995
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ECN report number:
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Document type:
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ECN-C--94-097
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ECN publication
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Number of pages:
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Full text:
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59
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Download PDF
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Abstract:
Several institutes and companies in the Netherlands participated in averification study for the applicability of available test methods for the
environmental evaluation of stabilized materials. A wide range of materials
(contaminated dredge spoil, MSWI fly ash, zinc ash, sewage sludge, paper
waste, flue gas cleaning waste and contaminated soil of a foundry ) were
tested with existing and recently developed methods after immobilisation with
different technologies provided by vendors. For the verification study the
following tests were applied or parameters assessed: total composition,
availability for leaching according to the Dutch Standard NEN 7341, diffusion
test according to NEN 7345, method for salt content (new), mobilized organic
matter (new), and a redox test. The diffusion test is a proper method to
assess stabilized materials for inorganic and, with minor modifications,
organic contaminants. The availability test is applicable to the variety of
stabilized materials with the exception of bituminous materials. The
determination of soluble salt content can best be assessed through the method
based on heating to dryness and weighing due to its simplicity and
applicability. The redox test indicates when reducing properties need to be
considered. The test for mobilized organic matter appears to be sufficiently
discriminating and indicates when possible complexation with dissolved
organic matter may be prominent. The extraction with 0.1 N NaOH, which is
used as the basis for this test, may be used as starting point for a method
to assess the availability of organic contaminants for leaching. For all
three additional tests an intercomparison study is recommended. 10 figs., 10
tabs., 2 appendices, 24 refs.
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