Abstract
Heavy metals released from industries causes severe environmental pollution in developing countries. This study has been conducted to evaluate the intensity of heavy metals pollution in soil at 0, 30 and 60 m distances from waste carrying canal of Bhaluka industrial area of Mymensingh, Bangladesh. Lead (Pb), chromium (Cr), copper (Cu), zinc (Zn), iron (Fe) and manganese (Mn) concentrations in soils decreased gradually with the increase of distance from waste canal. Maximum concentration was found at 60 to 0 m distance varied from 67.13–90.93, 52.23–76.73, 32.75–133.85, 61.18–422.10, 26900–36900 and 240–540 µg g-1 for Pb, Cr, Cu, Zn, Fe and Mn, respectively. Geoaccumulation index showing that the soil was moderately polluted for Pb and Zn. Pollution load index values>1.0, explaining pollution load was increased adjacent to industrial area and deteriorate the quality of surface soils day by day. Contamination factor for Pb, Cu and Zn were very high indicating these metals as the major soil pollutants came from anthropogenic sources which was supported by enrichment factor values (>5). The extent of pollution in adjacent to this industrial area implies the condition becoming worse and alarming for biota and inhabitants of that area.
Highlights
Soil is a dynamic natural resource for the survival of human life and regarded as the key receiver of the persistent pollutants like heavy metals [1, 2]
The concentration of all heavy metals decreased with the increasing of sampling distance from waste canal
The present result agrees with the investigation made by Sultana et al [22] who investigated the heavy metal contamination in the river sediments near industrial area of Dhaka
Summary
Soil is a dynamic natural resource for the survival of human life and regarded as the key receiver of the persistent pollutants like heavy metals [1, 2]. The residence time of heavy metals in soil is of the order of thousands of years The persistence of these metals in soils, uptake by crops results an accumulative effects in animal and human. This is because unlike organic pollutants, metals are not degraded biologically but transformed from one state to another [2, 7]. Concern over the environmental pollutants the toxic heavy metals has increased immensely in Bangladesh during the last few decades due to population explosion, unplanned industrialization and urbanization [9]. To best of our knowledge, no systematic investigation has been conducted so far, and metal toxicity data is severely insufficient to assess the ecological risk of heavy metals in soil near the industrial area in Bangladesh.
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