Journal
CHEMOSPHERE
Volume 201, Issue -, Pages 667-675Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.03.026
Keywords
Water pollution; Carcinogenic toxicity; Chromium; Depurative; Tannery waste
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology [15H01743, 15H02588, 17KT0033, 16K11177, 16K08440, 16K08343, 17K09156, 26670525, 16H01639, 24108002, 15H06274]
- Mitsui Co., Ltd. [R13-0014]
- Foundation from Center for Advanced Medical and Clinical Research of Nagoya University Hospital
- Mitsubishi Foundation [27310]
- Ichihara International Scholarship Foundation [196]
- KENKO-KAGAKU Zaidan (Health Sciences Foundation)
- Aichi Health Promotion Foundation
- AEON Environmental Foundation
- Nagono Medical Foundation
- Sumitomo Foundation [163119]
- Salt Science Research Foundation
- Grants-in-Aid for Scientific Research [16K11177, 16H01639, 15H02588, 17KT0033, 15H01743, 16K08440, 16K08343, 17K09156, 15H06274, 26670525] Funding Source: KAKEN
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Chromium (Cr) pollution caused by wastewater from tanneries is a worldwide environmental problem. To develop a countermeasure, we performed a comprehensive study using Hazaribagh, the tannery area in Dhaka City, Bangladesh, as a model. Our environmental monitoring indicated that the soluble form of Cr, but not barium or arsenic, in Buriganga River is derived from Hazaribagh. Our chemical analysis next showed that Cr, the primary pollutant in canal water at Hazaribagh, consisted of <= 0.7 mu M hexavalent Cr [Cr(VI)] and <= 1705 mu M trivalent Cr [COIN. Our biological study then showed that coexposure to Cr(VI) and 0(111) at possible ratios in canal water at Hazaribagh synergistically promotes transforming activity of human non-tumorigenic HaCaT keratinocytes with activated MEK/ERK and AKT. Our environmental engineering study finally indicated that a magnesium and iron-based hydrotalcite-like compound (MF-HT), our original depurative, can maximally adsorb 9.0 mg/g Cr(VI) and 1041 mg/g Cr(III). Our results suggested the importance of removal of Cr(III) as well as Cr(VI) by showing that Cr(III), which is generally recognized as a chemical with low toxicity, synergistically promoted carcinogenicity of a low level of Cr(VI). Therefore, we propose the use of our original high-efficient and low-cost depurative as a countermeasure to address the worldwide problem of environmental Cr pollution. (C) 2018 Elsevier Ltd. All rights reserved.
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