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Proceedings of the International Academy of Ecology and Environmental Sciences, 2017, 7(1): 1-11
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Article

Grain size fraction of heavy metals in soil and their relationship with land use

M. H. Sayadi1, A. Rezaei1, M. R. G. Sayyed2
1Department of Environmental Sciences, University of Birjand, Birjand, Iran
2Department of Geology, Poona College, Camp, Pune, 411001, India (Affiliated to Savitribai Phule Pune University)

Received 27 September 2016;Accepted 5 November 2016;Published 1 March 2017
IAEES

Abstract
The aim of the present study was to investigate the distribution of heavy metals (Pb, Ni, Cr and Cd) in different grain-size fractions of the surface soils. The soil samples of different land uses were taken from 20 cm depth at 12 stations where is located at Amir Abad of Birjand city, Iran. The air-dried samples were passed through sieves of different sizes to collect the fractions lesser than 63 ¦Ìm, 63-125 ¦Ìm, 125-250 ¦Ìm, 250-500 ¦Ìm, 500-1000 ¦Ìm and 1000-2000 ¦Ìm. The samples were digested by perchloric acid and nitric acid; and the concentrations of heavy metals were determined using Atomic Absorption Spectrophotometer (model AAcontr700). The highest concentrations for Pb, Cr, Ni and Cd (139.5, 195.4, 98.4 and 3.15 mg/kg respectively) were obtained in the fractions less than 63 ¦Ìm from the road-side soils. The contamination factor values for the fractions less than 63 ¦Ìm were higher than other fractions. The comparison of different toxic metals concentration from various grain-size fractions demonstrated higher Cr levels, especially in the 63-125 ¦Ìm size fractions from the road-side lands. Thus, the comparison of grain size factors from different soils revealed that Cr exhibited highest values in relation to the other toxic elements studied.

Keywords contamination factor;natural soil;pollution load index;residential soil;road-side soil.


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