| 1 | Source identification, contamination status and health risk assessment of heavy metals from road dusts in Dhaka, Bangladesh显示文摘In this study, concentrations of Cr, Mn, Ni, Cu, Zn, Cd and Pb were determined in road dusts collected from different locations in Dhaka to assess source, contamination status and health risk. Energy-dispersive X-ray fluorescence spectroscopy and energy-dispersive X-ray spectroscopy were used to determine Cr, Mn, Ni, Cu, Zn, Cd and Pb and their mean concentrations were 162.27 ± 29.46, 721.18 ± 180.14, 35.65 ± 12.55, 104.56 ± 128.33, 515.32 ± 321.90,BDL, and 342.82 ± 591.20 mg/kg, respectively. Among the heavy metals, highest concentrations of Cu, Zn and Pb were found at urban sites-7(municipal waste dumping) and 8(medical waste incineration). Highest concentration of Cr followed by Cu and Zn was found at site-5(Tejgaon, urban). Principal component analysis revealed that anthropogenic activities are the potential sources for Cr, Ni, Cu, Zn and Pb while earth crust for Mn. Pollution index and pollution load index results suggested that all the sites were contaminated and/or degraded by Cr, Cu, Zn and Pb except sites-9(urban), 10(sub-urban), 11(rural) while sites-7 and 8(urban) were extremely degraded. For noncarcinogenic health risk, hazard quotient values for dermal were higher compared to that of inhalation/ingestion. Though hazard index values were less than 1 at all the sites, these were at least one order of magnitude higher for children group than that of adult group, thus the children group may face more noncarcinogenic health risk at sites -7 and 8. Values of incremental lifetime cancer risk were from 10to 10showed no carcinogenic health risk by road dusts contaminated with the heavy metals. | Aklima Nargis Ahsan Habib Md Nazrul Islam Kai Chen Md Shafiqul Islam Sarker A N M Al-Razee Wenbin Liu Guorui Liu Minggang Cai | 2022 | Journal of Environmental Sciences2022，34，11： | 3 |
| 2 | Status of multielement in water of the river Buriganga, Bangladesh: Aquatic chemistry of metal ions in polluted river water显示文摘The peripheral rivers of Dhaka city became highly polluted because of industrialization and urbanization to a greater extent in the last few decades.Thus,an attempt has been taken to measure 48 elements in water of the river Buriganga using the ICP-MS method for the first time.Accordingly,it could be the reference values for future research in Bangladesh.Out of the 48 elements,the following metals are given more attention because of their detrimental effects on living organisms and for discussing their aquatic chemistry in polluted water body:Be,Na,Al,Cr,Mn,Fe,Ni,Cu,Zn,Cd,Ba,Hg,Pb,Bi and U.Results revealed that metals’concentrations in water in the monsoon were less than that of the winter,however,Cr and Fe were found at below detection limits in the winter that is unexpected.Physicochemical parameters of the river water such as pH,dissolved oxygen play vital roles for hydrolysis reactions in the stagnant water body.Hydrolyzed products of metal ions having low values of solubility products(K sp),for example,iron(III)hydroxide,chromium(III)hydroxide,phase out through precipitation reactions.This study also detects and quantifies total concentrations of Hg and U in water of the river Buriganga for the first time.PCA and correlation matrix results provided potential sources of the relevant metals.Mechanisms of hydrolysis and precipitation reactions for metal ions in the polluted river water are also discussed. | Aklima Nargis Ahsan Habib Harun-Or-Rashid Halima Binte Harun Md Shafiqul Islam Sarker Rong Jin Guorui Liu Wenbin Liu A.N.M.Al-Razee Kai Chen Minggang Cai | 2021 | Emerging Contaminants2021，7，1： | 1 |
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