Assessment of Heavy Metal Contamination of Agricultural Soil around Dhaka Export Processing Zone (DEPZ), Bangladesh: Implication of Seasonal Variation and Indices
Intense urbanization, large scale industrialization and unprecedented population growth in the last few decades have been responsible for lowering environmental quality. Soil contamination with metals is a serious concern due to their toxicity and ability to accumulate in the biota. The present work assessed the heavy metal contamination of agricultural soil in the close vicinity of the Dhaka Export Processing Zone (DEPZ) in both dry and wet seasons using different indices viz., index of geoaccumulation (I geo), contamination factor ( ), degree of contamination ( ), modified degree of contamination ( mCd) and pollution load index (PLI). Samples were collected from the surface layer of soil and analyzed by Atomic Absorption Spectrophotometer (AAS). The trend of metals according to average concentration during the dry and wet seasons was As？>？Fe？>？Hg？> Mn？>？Zn？>？Cu？>？Cr？>？Ni？>？Pb？>？Cd and As？>？Fe？>？Mn？>？Zn？>？Hg？>？Cu？>？Ni？>？Cr？>？Pb？>？Cd, respectively. Because of seasonal rainfall, dilution and other run-off during the wet season, metals from the upper layer of soil were flushed out to some extent and hence all the indices values were lower in this season compared to that of the dry season. I geo results revealed that the study area was strongly and moderately contaminated with As and Hg in the dry and wet seasons respectively. According to , soil was classified as moderately contaminated with Zn, Cr, Pb and Ni, considerably contaminated with Cu and highly contaminated with As and Hg. The general trend of the mean？was Hg？>？As？>？Cu？> Zn？>？Ni？>？Cr？>？Pb？>？Fe？>？Mn？>？Cd and As？>？Hg？>？Cu？>？Cd？>？Zn？>？Ni？>Pb？>？Fe？>？Mn in dry and wet seasons, respectively. The mC f values in the dry and wet seasons were 575.13 and 244.44 respectively indicating an ultra high degree of contamination. The C d values in both seasons were associated with a very high degree of contamination. PLI results indicated immediate intervention to ameliorate pollution in both seasons. The main sources of metals included effluents from wastewater treatment plants, treated and untreated wastewater from surrounding industrial establishments as well as agricultural activities. Protecting the agricultural soil is a formidable challenge in the study area, which requires modernization of industries, thereby improving the recovery and recycling of wastewater. Indices analysis presented in the present work could serve as a landmark for contemporary research in toxicology.
References
[1]
USDA (United States Department of Agriculture Natural Resources Conservation Services Soils Quality Institute). Urban Technical Note. 2001.
[2]
Thuy, H.T.T.; Tobschall, H.J.; An, P.V. Distribution of heavy metals in urban soils—A case study of Danang-Hoian area (vietnam). Environ. Geogr. 2000, 39, 603–610.
[3]
Mingorance, M.D.; Valdes, B.; Oliva-Rossini, S. Strategies of heavy metal uptake by plants growing under industrial emissions. Environ. Int. 2007, 33, 514–520, doi:10.1016/j.envint.2007.01.005.
[4]
Alam, M.G.M.; Snow, E.T.; Tanaka, A. Arsenic and heavy metal concentration of vegetables grown in Samta village, Bangladesh. Sci. Total Environ. 2003, 111, 811–815.
[5]
Arora, M.; Kiran, B.; Rani, A.; Rani, S.; Kaur, B.; Mittal, M. Heavy metal accumulation in vegetables irrigated with water from different sources. Food Chem. 2008, 111, 811–815, doi:10.1016/j.foodchem.2008.04.049.
[6]
Bhuiyan, M.A.H.; Suruvi, N.I.; Dampare, S.B.; Islam, M.A.; Quraishi, S.B.; Ganyaglo, S.; Suzuki, S. Investigation of the possible sources of heavy metal contamination in lagoon and canal water in the tannery industrial area in Dhaka, Bangladesh. Environ. Monit. Assess. 2011, 175, 633–649, doi:10.1007/s10661-010-1557-6. 20544274
[7]
Ahmed, G.; Uddin, M.K.; Khan, G.M.; Rahman, M.S.; Chowdhury, D.A. Distribution of trace metal pollutants in surface water system connected to effluent disposal points of Dhaka Export Processing Zone (DEPZ), Bangladesh: A statistical approach. J. Nat. Sci. Sus. Technol. 2009, 3, 293–304.
[8]
Mortula, M.M.; Rahman, M.S. Study on waste disposal at DEPZ. Bangladesh Environ. (BAPA) 2002, 2, 807–817.
[9]
Yadav, R.K.; Goyal, B.; Sharma, R.K.; Dubey, S.K.; Minhas, P.S. Post irrigation impact of domestic sewage effluent on composition of soils, crops and ground water—A case study. Environ. Int. 2002, 28, 481–486, doi:10.1016/S0160-4120(02)00070-3.
[10]
Singh, K.P.; Mohan, D.; Sinha, S.; Dalwani, R. Impact assessment of treated/untreated wastewater toxicants discharged by sewage treatment plants on health, agricultural, and environmental quality in the wastewater disposal area. Chemosphere 2004, 55, 227–255, doi:10.1016/j.chemosphere.2003.10.050.
[11]
Chen, Y.; Wang, C.; Wang, Z. Residues and sources identification of persistent organic pollutants in farmland soils irrigated by effluents from biological treatment plants. Environ. Int. 2005, 31, 778–783, doi:10.1016/j.envint.2005.05.024.
[12]
Mapanda, F.; Mangwayana, E.N.; Nyamangara, J.; Giller, K.E. The effect of long-term irrigation using wastewater on heavy metal contents of soils under vegetables in Harare, Zimbabwe. Agric. Ecosys. Environ. 2005, 107, 151–165, doi:10.1016/j.agee.2004.11.005.
[13]
Luo, X.; Yu, S.; Zhu, Y.; Li, X. Trace metal contamination in urban soils of China. Sci. Total Environ. 2012, 441–442, 17–30.
[14]
Muchuweti, M.; Birkett, J.W.; Chinyanga, E.; Zvauya, R.; Scrimshaw, M.D.; Lester, J. Heavy metal content of vegetables irrigated with mixture of wastewater and sewage sludge in Zimbabwe: Implications for human health. Agric. Ecosys. Environ. 2006, 112, 41–48, doi:10.1016/j.agee.2005.04.028.
[15]
Sharma, R.K.; Agrawal, M.; Marshall, F. Heavy metal contamination in vegetables grown in wastewater irrigated areas of Varanasi, India. Bull. Environ. Contam. Toxicol. 2006, 77, 312–318, doi:10.1007/s00128-006-1065-0. 16977535
[16]
Sharma, R.K.; Agrawal, M.; Marshall, F. Heavy metal (Cu, Zn, Cd and Pb) contamination of vegetables in urban India: A case study in Varanasi. Environ. Poll. 2008, 154, 254–263, doi:10.1016/j.envpol.2007.10.010.
[17]
Khan, M.K.; Alam, A.M.; Islam, M.S.; Hassan, M.Q.; Al-Mansur, M.A. Environmental pollution around Dhaka EPZ and its impact on surface and groundwater. Bangladesh J. Sci. Ind. Res. 2011, 46, 153–162.
[18]
Khanam, D.; Rahman, S.H.; Islam, M.S.; Ahsan, M.A.; Shaha, B.; Akbor, M.A.; Beg, R.U.; Adyel, T.M. Seasonal implication of heavy metal contamination of surface water around Dhaka Export Processing Zone (DEPZ), savar, bangladesh. Jahangirnagar Univ. J. Sci. 2011, 34, 21–35.
[19]
Mahfuz, M.A.; Ahmad, J.U.; Sultana, M.S.; Rahman, M.M.; Goni, M.A.; Rahman, M.S. Status of physicochemical properties of wastewater in Bangladesh: A cash studies in Dhalai Beel of DEPZ. Bangladesh J. Environ. Res. 2004, 2, 9–15.
[20]
Rahman, S.H.; Neelormi, S.; Tareq, S.M. Environmental impact assessments of textile and dyeing industries on ecosystem of Karnopara canal at Savar, Bangladesh. Jahangirnagar Univ. J. Sci. 2008, 31, 19–32.
[21]
Muller, G. Index of Geoaccumulation in sediments of the Rhine River. Geo. J. 1969, 2, 108–118.
[22]
Taylor, S.R.; Mclennan, S.M. The geochemical evolution of the continental crust. Rev. Geophys. 1995, 33, 241–265, doi:10.1029/95RG00262.
[23]
Muller, G. Die Schwermetallbelstung der sediment des Neckars und seiner Nebenflusse: Eine Bestandsaufnahme. Chem. Zeitung. 1981, 105, 156–164.
[24]
Hakanson, L. An ecological risk index for aquatic pollution control, a sedimentological approach. Water Res. 1980, 14, 975–1001, doi:10.1016/0043-1354(80)90143-8.
[25]
Krzysztof, L.; Wiechula, D.; Korns, I. Metal contamination of farming soils affected by industry. Environ. Int. 2004, 30, 159–165, doi:10.1016/S0160-4120(03)00157-0.
[26]
Abrahim, G.M.S.; Parker, R.J. Assessment of heavy metal enrichment factors and the degree of contamination in marine sediments from Tamaki Estuary, Auckland, New Zealand. Environ. Monit.Assess. 2008, 136, 227–238. 17370131
[27]
Tomlinson, D.L.; Wilson, J.G.; Harris, C.R.; Jeffrey, D.W. Problems in the assessment of heavy metal levels in estuaries and the formation of a pollution index. Helgolaender Meeresunter. 1980, 33, 566–575, doi:10.1007/BF02414780.
[28]
Turekian, K.K.; Wedepohl, K.H. Distribution of the elements in some major units of the earth’s crust. Bull. Geo. Soc. Am. 1961, 72, 175–192, doi:10.1130/0016-7606(1961)72[175:DOTEIS]2.0.CO;2.
[29]
Angula, E. The Tomlinson Pollution Index applied to heavy metal, Mussel–Watch data: A useful index to assess coastal pollution. Sci. Total Environ. 1996, 187, 19–56, doi:10.1016/0048-9697(96)05128-5.
[30]
Kisku, G.C.; Barman, S.C.; Bhargava, S.K. Contamination of soil and plants with potentially toxic elements irrigated with mixed industrial effluent and its impact on the environment. Water Air Soil Poll. 2000, 120, 121–137, doi:10.1023/A:1005202304584.
[31]
Islam, M.M.; Halim, M.A.; Safiullah, S.; Hoque, S.A.M.W.; Islam, M.S. Heavy metal (Pb, Cd, Zn, Cu, Cr and Mn) content in textile sludge in Gazipur, Bangladesh. Res. J. Environ. Sci. 2009, 3, 311–315, doi:10.3923/rjes.2009.311.315.
[32]
Yaylali-Abanuz, G. Heavy metal contamination of surface soil around Gebze industrial area, Turkey. Microchem. J. 2011, 99, 82–92, doi:10.1016/j.microc.2011.04.004.
[33]
Kabata-Pendias, A. Trace Element in Soils and Plants; CRC Press: Boca Raton, FL, USA, 2000; p. 413.
[34]
SEPA. The Limits of Pollutants in Food; GB2762-2005; State Environmental Protection Administration: Beijing, China, 2005.
[35]
Awashthi, S.K. Prevention of Food Adulteration Act No. 37 of 1954. Central and State Rules as Amended for 1999; Ashoka Law House: New Delhi, India, 2000; p. 2000.
[36]
Loska, K.; Wiechula, D.; Korus, I. Metal contamination of farming soils affected by industry. Environ. Int. 2004, 30, 159–165, doi:10.1016/S0160-4120(03)00157-0.
[37]
Ahmed, J.U.; Gani, M.A. Heavy metal contaminations in water, soil and vegetation of the industrial areas in dhaka, Bangladesh. Environ. Monit. Assess. 2010, 166, 347–357, doi:10.1007/s10661-009-1006-6.
[38]
Mondol, M.N.; Chamon, A.S.; Faiz, B.; Elahi, S.F. Seasonal variation of heavy metal concentrations in Water and plant samples around Tejgaon industrial Area of Bangladesh. J. Bangladesh Acad. Sci. 2011, 35, 19–41.
[39]
Roa, M.S.; Gopalkrishnan, R.; Venkatesh, B.R. Medical geology—An emerging field in environmental science. In National Symposium on Role of Earth Sciences, Integrated and Related Societal Issues, Lucknow, India, 2–4 November 2001; 2001; pp. 213–222. GSI Spl. Pub. No. 65.
[40]
Ahmed, G.; Miah, M.A.; Anawar, H.M.; Chowdhury, D.A.; Ahmad, J.U. Influence of multi-industrial activities on trace metal contamination: An approach towards surface water body in the vicinity of Dhaka Export Processing Zone (DEPZ). Environ. Monit. Assess. 2011, doi:10.1007/s10661-011-2254-9.
[41]
Co？kun, M.; Steinnes, E.; Frontasyeva, V.F.; Sjobakk, T.E.; Demnika, S. Heavy metal pollution of surface soil in the Thrace region, Turkey. Environ. Monit. Assess. 2006, 119, 545–556, doi:10.1007/s10661-005-9042-3.
[42]
Edwards, A.L. The Correlation Coefficient. In Introduction to Linear Regression and Correlation; W. H. Freeman and Company: San Francisco, CA, USA, 1976; pp. 33–46. Chapter 4.
