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Release characteristics of Cd, Cu and Zn from the natural and contam inated red soils under simulated acid rain

Liao, Bo-han and Zeng, Min and Guo, Zhao-hui and Probst, Anne Release characteristics of Cd, Cu and Zn from the natural and contam inated red soils under simulated acid rain. (2009) Environmental chemistry, vol. 2 (n° 3). pp. 344 -349.

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Abstract

Release characteristics of Cd, Cu and Zn from red soils under acid rain and the related influencing factors were studied and differences in heavy metal release from natural soils and contaminated soils were compared in this paper through a leaching experiment of simulated acid rain for two natural red soils and two contaminated red soils1 The results indicated that in the natural red soils, release of Cd, Cu and Zn increased linearly with increasing leaching amounts of simulated acid rain, and the accumulative amounts of released heavy metals increased with increasing acidity of acid rain, showing a sequence of Zn > Cu > Cd. There existed significant linear relationships between Cu or Zn release and Cd release. In the contaminated soils, however, Cd release increased logarithmically with increasing leaching amounts of simulated acid rain, but Cu release increased still in a linear way. Zn release was a linear patter when weak acid rain was applied, but a logarithmic one when strong acid rain was applied. There were non-linear relationships among releases of Cd, Cu and Zn. The release sequence of heavy metals in the contaminated red soils was Cd > Zn > > Cu. About 26% -76% of external Cd and 11% - 68% of external Zn were released through leaching of acid rain, but more than 99% of external Cu was absorbed by the soils. Meanwhile, accumulative release amounts of these three elements were all significantly logarithmically related to H+ accumulative amounts in the leachates, but only those of Cd and Zn were also logarithmically related to TOC ( total organic carbon) accumulative amounts. The relationships between Cu release and TOC release were a power pattern. For the natural red soils, possibility of acid rain stimulating heavy metal contamination was little due to a small release amount of heavy metals; for the contaminated red soils, however, a great amount of heavy metals especially Cd and Zn were released under acid rain, and contamination with heavy metals in soil-plant systems was greatly possible.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Central South University - CSU (CHINA)
French research institutions > Institut de Recherche pour le Développement - IRD
Other partners > Central South University of Forestry and Technology - CSUFT (CHINA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Florence Amor

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