Speciation of Cd and Pb in organic soil treated with municipal sewage
2014
Domańska, Jolanta
The studies were carried out on the basis of field experiment. The purpose of this study was to determine the effect of purified municipal sewage, applied in single (optimal for plant growth) and double doses, on the content of Cd and Pb, and its chemical speciation in organic neutral soil. The sequential extraction procedure was used to separate Cd and Pb from soil into 5 operationally defined fractions: exchangeable F1, “carbonate bound”. . specifically bound F2, bound to Fe-Mn oxides F3, bound to organic matter F4, and residual F5. The total content of Pb in reference soil and in soils treated with sewage was lower than permissible values accepted in Poland for natural soils, while the content of Cd exceeded the highest acceptable level for natural organic soils. The Cd association with different geochemical fractions, both in soil fertilized with sewage, and unfertilized (control) soils, followed the order [%]: F3>F2>F4>F1³F5. Cadmium was associated mainly with F3 (51.60%) and F2 (23.26%) fractions, while 6.8% was stated in exchangeable form (F1). Speciation distribution of Pb was lined up in the order [%]: F3>F4>F2>F5>F1. Lead was retained mainly in F3 (46.56%), F4 (21.30%) and F2 (10.13%) fractions. In soils treated with sewage there were stated the higher amounts of metals bound to organic fraction compared to reference soil
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