Chemical speciation of trace metals in the industrial sludge of Dhaka City, Bangladesh

The objective of this study was to assess total concentration and chemical fractionation of trace metals in the industrial wastewater and sludge collected from seven different types of industries in Dhaka City, Bangladesh. The sludge from industries is either dumped on landfills or reused as seconda...

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Bibliographic Details
Published in:Water science and technology 2017-07, Vol.76 (2), p.256-267
Main Authors: Islam, Md Saiful, Al-Mamun, Md Habibullah, Feng, Ye, Tokumura, Masahiro, Masunaga, Shigeki
Format: Article
Language:English
Subjects:
Bioavailability
Cadmium
Chemical fractionation
Chemical speciation
Chromium
Cities
Copper
Economic development
Environmental impact
Fractionation
Heavy metals
Inductively coupled plasma mass spectrometry
Industrial wastes
Industrial wastewater
Industry
Landfill
Landfills
Lead
Mass spectrometry
Mass spectroscopy
Metal concentrations
Metals
Natural resources
Nickel
Pollutants
Sludge
Speciation
Toxicity
Trace metals
Waste disposal sites
Wastewater
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Summary:The objective of this study was to assess total concentration and chemical fractionation of trace metals in the industrial wastewater and sludge collected from seven different types of industries in Dhaka City, Bangladesh. The sludge from industries is either dumped on landfills or reused as secondary resources in order to preserve natural resources. Metals were analyzed using inductively coupled plasma mass spectrometry (ICP-MS). The ranges of Cr, Ni, Cu, As, Cd, and Pb in the sludges were 1.4-9,470, 4.8-994, 12.8-444, 2.2-224, 1.9-46.0 and 1.3-87.0 mg/kg, respectively. As a whole, the average concentrations of trace metals in samples were in the decreasing order of Cr > Ni > Cu > As > Pb > Cd. The results of the Community Bureau of Reference (BCR) sequential extraction showed that the studied metals were predominantly associated with the residual fraction followed by the oxidizable fraction. The study revealed that the mobile fractions of trace metals are poorly predictable from the total content, and bioavailability of all fractions of elements tends to decrease.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2017.187