title: Heavy metal pollution of coal mine-affected agricultural soils in the northern part of Bangladesh.
abstract: Total concentrations of heavy metals in the soils of mine drainage and surrounding agricultural fields in the northern part of Bangladesh were determined to evaluate the level of contamination. The average concentrations of Ti, Mn, Zn, Pb, As, Fe, Rb, Sr, Nb and Zr exceeded the world normal averages and, in some cases, Mn, Zn, As and Pb exceeded the toxic limit of the respective metals. Soil pollution assessment was carried out using enrichment factor (EF), geoaccumulation index (I(geo)) and pollution load index (PLI). The soils show significant enrichment with Ti, Mn, Zn, Pb, As, Fe, Sr and Nb, indicating inputs from mining activities. The I(geo) values have revealed that Mn (1.24+/-0.38), Zn (1.49+/-0.58) and Pb (1.63+/-0.38) are significantly accumulated in the study area. The PLIs derived from contamination factors indicate that the distal part of the coal mine-affected area is the most polluted (PLI of 4.02). Multivariate statistical analyses, principal component and cluster analyses, suggest that Mn, Zn, Pb and Ti are derived from anthropogenic sources, particularly coal mining activities, and the extreme proximal and distal parts are heavily contaminated with maximum heavy metals.
authors.affiliation: Graduate School of Natural Science & Technology, Okayama University, Okayama 700-8530, Japan. amirhb75@yahoo.com
authors.forename: Mohammad A H
authors.initials: MA
authors.lastname: Bhuiyan
authors.forename: Lutfar
authors.initials: L
authors.lastname: Parvez
authors.forename: M A
authors.initials: MA
authors.lastname: Islam
authors.forename: Samuel B
authors.initials: SB
authors.lastname: Dampare
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Suzuki
mesh_terms: D000383:Agriculture; D000465:Algorithms; D001459:Bangladesh; D016000:Cluster Analysis; D003032:Coal Mining; D004787:Environmental Pollution / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013052:Spectrometry, X-Ray Emission; D014961:X-Ray Diffraction
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants