Assessment of heavy metals in air samples of Municipal solid waste (MSW) disposal sites and transfer stations of Lahore, Pakistan

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Research Paper 01/03/2020
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Assessment of heavy metals in air samples of Municipal solid waste (MSW) disposal sites and transfer stations of Lahore, Pakistan

Sana Hafeez, Zulfiqar Ali, Shahid Sher, Zaheer Ahmed Nasir
Int. J. Biosci.16( 3), 352-361, March 2020.
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The presence of heavy metals in municipal solid waste is of emerging concern. In order to provide information on the concentration of heavy metals chromium (Cr), manganese (Mn), zinc (Zn), lead (Pb), nickel (Ni) and copper (Cu) in air samples of solid waste management sites, a total of 16 times survey was made at solid waste disposal sites and transfer stations of Lahore, Pakistan. Four sites were selected for sampling during the period of 2017-2018 on the basis of wet and dry season.Portable air sampler was used for sucking the air on Whatmann 41 filter paper for the collection of air samples. Metrological parameters were also measured during sampling period. Samples were analyzed by acid digestion and flame atomic absorption spectrophotometer. The average concentration of Cr, Mn, Zn, Pb, Ni and Cu in ambient air ranged between 0.09-1.97 µg/m3, 0.09-0.25 µg/m3, 2.18-6.15 µg/m3, 0.59-1.24 µg/m3, 0.27-0.34 µg/m3,0.25-0.47 µg/m3 in wet season and 0.13-2.19 µg/m3, 0.01-0.61 µg/m3, 0.22-4.96 µg/m3, 0.31-1.46 µg/m3, 0.29-0.32 µg/m3, 0.17-0.36 µg/m3 in dry season respectively.Statistical analysis (ANOVA) showed that the concentration of metals Zn, Pb and Cu was significant at four sampling sites and in both season. The relationship between metrological parameters and heavy metals were also statistically evaluated. It was determined that the ambient air within services of solid waste management sites is unsafe for adjacent population. Though more information is required to suggest the extreme separation at which air from these localities go to the encompassing level.


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