Salinity-induced fluorescent dissolved organic matter influence co-contamination, quality and risk to human health of tube well water, southeast coastal Bangladesh

被引：42

作者：

Kabir, Mohammad Mahbub ^{[1
,2
]}

Akter, Samia ^{[1
]}

Ahmed, Farah Tasneem ^{[3
]}

Mohinuzzaman, Mohammad ^{[1
]}

Didar-ul-Alam, Md ^{[2
]}

Mostofa, Khan M. G. ^{[4
,5
]}

Islam, Abu Reza Md Towfiqul ^{[6
]}

Niloy, Nahin Mostofa ^{[7
]}

机构：

[1] Noakhali Sci & Technol Univ, Dept Environm Sci & Disaster Management, Noakhali 3814, Bangladesh

[2] Noakhali Sci & Technol Univ, Res Cell, Noakhali 3814, Bangladesh

[3] Atom Energy Res Estab, Nucl & Radiat Chem Div, Inst Nucl Sci & Technol, Dhaka 1349, Bangladesh

[4] Tianjin Univ, Inst Surface Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China

[5] Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, 92 Weijin Rd, Tianjin 300072, Peoples R China

[6] Begum Rokeya Univ, Dept Disaster Management, Rangpur 5400, Bangladesh

[7] Jahangirnagar Univ, Dept Environm Sci, Hydrobiogeochem & Pollut Control Lab, Dhaka 1342, Bangladesh

来源：

CHEMOSPHERE | 2021年 / 275卷

关键词：

Trace metals; PARAFAC modeling; Groundwater quality; Salinity induced-FDOM; Mobilization of trace metals; EXCITATION-EMISSION MATRIX; GROUNDWATER QUALITY; DRINKING-WATER; OPTICAL-PROPERTIES; TANNERY EFFLUENTS; HUMIC SUBSTANCES; METAL POLLUTION; BENGAL BASIN; WEST-BENGAL; SPECTROSCOPY;

D O I：

10.1016/j.chemosphere.2021.130053

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Salinity in the drinking water of coastal Bangladesh results from a severe socio-economic, environmental and human health safety crisis. In this paper, we analyzed 120 tube well water samples from southeast coastal Bangladesh for eight trace metals (TMs). Contamination, quality and risk of TMs to human health of tube well water influenced by salinity-induced fluorescent dissolved organic matter (FDOM) were assessed using multiple pollution indices, GWquality index (GWQI), traditional health risk, and PARAFAC models. The mean values of EC, Fe, Cd, Cr, and As surpassed the limit set by local and international standards with significant spatial variations. The results of the GWQI showed that 52.5% of the samples were within the moderate-poor quality range in the study region. PARAFAC modeling identified three groundwater FDOM constituents with a coupling of humic acid (HA), fulvic acid (FA), and degraded fulvic acid (DFA)-like substances. Moreover, the positive correlations among EC, TMs, HA, FA, and DFA proved that salinity-induced FDOM had significant contributions to the dissolution potential of contaminants in the aquifer, hence increased the mobilization of TMs. Health risk models suggested that children are more susceptible to the non-carcinogenic and carcinogenic risks than adults at the community level. The carcinogenic risks of Cd, As, Pb, and Cr via oral exposure pathway indicated the highest carcinogenic risks for both adults and children. The findings also indicated that the salinity-derived FDOM-TMs complex is the key driver to groundwater co-contaminations and elevated health impacts. Besides, high concentrations of Fe and As are the key causal issues for sustainable water safety. Thus, strict water management and monitoring plans require preventing these contaminants for sustainable community well-being in the coastal region. (C) 2021 Elsevier Ltd. All rights reserved.

引用

页数：17

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