Cleaning heavy metal contaminated soil with soluble humic substances instead of synthetic polycarboxylic acids

Autor:	Bjarne W. Strobel, Peter E. Holm, Ole K. Borggaard, Julie K. Jensen, Mohsen Soleimani
Rok vydání:	2011
Předmět:	Cadmium Nitrilotriacetic acid Soil Science chemistry.chemical_element Ethylenediaminetetraacetic acid Contamination complex mixtures Soil contamination Copper chemistry.chemical_compound chemistry Environmental chemistry Soil water Agronomy and Crop Science Calcareous
Zdroj:	Acta Agriculturae Scandinavica, Section B - Soil & Plant Science. 61:577-581
ISSN:	1651-1913 0906-4710
DOI:	10.1080/09064710.2010.515602
Popis:	Soils contaminated with heavy metals constitute a serious and widespread ecological problem but to clean such soils requires strong chemicals such as polycarboxylates; frequently ethylenediaminetetraacetic acid and nitrilotriacetic acid are used. However, these compounds are synthetic and toxic and their replacement by natural products such as soluble humic substances as washing agents for cleaning heavy metal polluted soils would be environmentally very attractive. In fact, such a replacement seems possible at least on cadmium and copper contaminated soil inasmuch as humic substances, depending on the concentration, were found to extract up to 45% and 54% of total cadmium and copper from a highly contaminated calcareous soil. Even though higher amounts of the two metals were extracted by ethylenediaminetetraacetic acid and nitrilotriacetic acid, the humic substances undoubtedly extracted the most reactive fractions. However, the humic substances extracted only 4% of total lead and 17% of total n...
Databáze:	OpenAIRE
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