A comparison of sequential extraction procedures for fractionation of arsenic,cadmium, lead,and zinc in soil |
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Authors: | Pavel Tlusto? Ji?ina Száková Alena Stárková Daniela Pavlíková |
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Institution: | (1) Department of Agrochemistry and Plant Nutrition, Czech University of Agriculture, CZ-165 21 Prague 6- Suchdol, Czech Republic |
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Abstract: | Twelve soil samples differing in physicochemical properties and total element contents were extracted by three sequential
extraction procedures to determine As, Cd, Pb, and Zn bound to individual soil fractions and are defined by individual operational
procedures. In the case of arsenic, two additional sequential extraction schemes were designed entirely for fractionation
of soil containing arsenic were tested. The results confirmed that determination of element proportions bound to individual
soil fractions is strongly dependent on the extracting agent and/or procedure applied within individual extracting schemes.
As expected, absolute values of the elements released among the individual extracting procedures are weakly comparable. More
reliable results were determined for the more mobile soil elements i.e. cadmium and zinc, in the fractions characterizing
the most mobile proportions of investigated elements where significant correlations with basic soil characteristics were observed.
In contrast, ambiguous results were observed for As and Pb, for both the individual extraction procedures and the effect of
the soil characteristics. Regardless of the studied element, the poorest results were determined for reducible and oxidizable
soil fractions. The application of at least two independent procedures or modification of the extraction scheme according
to element investigated and/or particular soil characteristics can also be helpful in definition of element pattern in soils
in further research. |
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Keywords: | Arsenic cadmium lead soil sequential extraction zinc |
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