Leaching of cr from wood ash – discussion based on different extraction procedures

Lisbeth M. Ottosen, Pernille E. Jensen, Gunvor M. Kirkelund, Alexandra B. Ribeiro

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Experimental work with wood ash (WA) from incineration of virgin wood shows that about 45% of the initial 79 mg/kg Cr leaches out in water, and even after a three step washing process in water, the WA leaches Cr. The leaching is highest at highly alkaline conditions. Electro-dialysis showed that the leached Cr was in anionic form, but at the present high pH, both Cr(III) and Cr(VI) can form anionic complexes, so the oxidation state cannot be determined from this investigation. Because the extraction of Cr is so dependent on pH under alkaline conditions, the use of acid in the first step of sequential extraction gave an error in assessing the Cr present in this step. More Cr is extracted from WA in water than in weak acid.

Original languageEnglish
Title of host publicationWastes: Solutions, Treatments and Opportunities III - Selected papers from the 5th International Conference Wastes: Solutions, Treatments and Opportunities, 2019
EditorsCândida Vilarinho, Fernando Castro, Margarida Gonçalves, Ana Luísa Fernando
PublisherCRC Press/Balkema
Pages408-413
Number of pages6
ISBN (Print)9780367257774
DOIs
Publication statusPublished - 2020
Event5th International Conference Wastes: Solutions, Treatments and Opportunities, 2019 - Costa da Caparica, Portugal
Duration: 4 Sep 20196 Sep 2019

Conference

Conference5th International Conference Wastes: Solutions, Treatments and Opportunities, 2019
CountryPortugal
CityCosta da Caparica
Period4/09/196/09/19

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