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ECN publication
Comparison of pH static leach test data with ANC test data
Published by: Publication date:
ECN 1997
ECN report number: Document type:
ECN-R--97-002 Other
Number of pages: Full text:
38 Download PDF  

Within the framework of the CEN TC 292 Working Group 6, the developmentof a standardised method for the determination of the pH dependence of leaching has been taken as a work item. Two main methods qualify for this activity: a pH static test, in which the pH is controlled continuously, and an Acid Neutralisation Capacity test, in which the amount of acid or base required to reach a final pH is added right at the beginning. For two materials, sewage amended soil en stabilised Municipal Solid Waste Incinerator fly ash, a comparison between these two methods is made. This comparison is generally good considering the difference in leaching behaviour of the two materials and the agreement for a wide range of elements. Differences in leaching behaviour in the pH domain 6-8 between pH-stat and ANC method are discussed. The possible uses of the pH dependent leaching behaviour as obtained by these tests is discussed. 17 figs., 1 tab., 11 refs.

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