Abstract
Purpose
As the basic structural unit of soil, aggregates are different in distribution and their ability to release Pb. This study aimed to investigate the effect of soil aggregate-size fractions on the release and fractionation of Pb in some heavy metal-contaminated soils of central Iran.
Materials and methods
The bulk soil of five contaminated soils was partitioned into four aggregate size fractions. The release characteristics of Pb in a period of 1–890 h and Pb fractions were studied in each aggregate size fraction.
Results and discussion
The distribution pattern of Pb in the bulk soil and different aggregates indicated that Pb was mainly associated with the Fe–Mn oxide and organic bound fractions. The mean released Pb after 890 h was higher in <0.05 (59.3 mg kg−1) and 0.05–0.25 mm (53.5 mg kg−1) fractions. Simplified Elovich and power function equations were found to be more successful in describing the release kinetics of Pb. There was a positive correlation between the amount of Pb released and the Pb associated with organic fraction in the bulk soil and 0.05–0.25 mm fraction, thereby suggesting that Pb associated with organic fraction in the finer aggregate size fractions constituted the major available Pb pools in studied contaminated soils.
Conclusions
Soil type and aggregate distribution could be regarded as important factors controlling distribution patterns of Pb fractions in studied soils. The available Pb in smaller aggregate fractions appeared to be more readily released than in the larger aggregate fractions. Therefore, the distribution and release of Pb in soil aggregates should be considered in decisions made regarding Pb management.
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Farshadirad, A., Hosseinpur, A., Motaghian, H. et al. Release kinetics and distribution of lead in various size fraction of aggregates. J Soils Sediments 18, 179–188 (2018). https://doi.org/10.1007/s11368-017-1722-4
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DOI: https://doi.org/10.1007/s11368-017-1722-4