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      Heavy metal pollution and transboundary issues in ASEAN countries

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      Water Policy
      IWA Publishing

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          Abstract

          The presence of heavy metals in waterways is a major threat to human health, and such metals cause stomach cancer and brain damage. There is a growing trend towards heavy metal pollution in the Association of Southeast Asian Nations (ASEAN) countries due to inappropriate environmental management and the development of the region's chemical industry. In some border areas, transboundary heavy metal pollution significantly affects people's daily lives. The traditional ASEAN approach to solving heavy metal pollution has limitations due to various problems that affect the ASEAN region, such as unbalanced economic growth, a shortage of environmental technology, and a lack of regional law enforcement. As a result, more effective regional governance on heavy metal pollution and transboundary issues is urgently required. In this paper, network governance theory is used to study environmental problems. This paper recommends that voluntary governance is used to supplement traditional state-centric governance.

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          Most cited references18

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          Removal of Hexavalent Chromium-Contaminated Water and Wastewater: A Review

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            The Dynamics of Multi-organizational Partnerships: an Analysis of Changing Modes of Governance

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              Arsenic contamination of groundwater and drinking water in Vietnam: a human health threat.

              This is the first publication on arsenic contamination of the Red River alluvial tract in the city of Hanoi and in the surrounding rural districts. Due to naturally occurring organic matter in the sediments, the groundwaters are anoxic and rich in iron. With an average arsenic concentration of 159 micrograms/L, the contamination levels varied from 1 to 3050 micrograms/L in rural groundwater samples from private small-scale tubewells. In a highly affected rural area, the groundwater used directly as drinking water had an average concentration of 430 micrograms/L. Analysis of raw groundwater pumped from the lower aquifer for the Hanoi water supply yielded arsenic levels of 240-320 micrograms/L in three of eight treatment plants and 37-82 micrograms/L in another five plants. Aeration and sand filtration that are applied in the treatment plants for iron removal lowered the arsenic concentrations to levels of 25-91 micrograms/L, but 50% remained above the Vietnamese Standard of 50 micrograms/L. Extracts of sediment samples from five bore cores showed a correlation of arsenic and iron contents (r2 = 0.700, n = 64). The arsenic in the sediments may be associated with iron oxyhydroxides and released to the groundwater by reductive dissolution of iron. Oxidation of sulfide phases could also release arsenic to the groundwater, but sulfur concentrations in sediments were below 1 mg/g. The high arsenic concentrations found in the tubewells (48% above 50 micrograms/L and 20% above 150 micrograms/L) indicate that several million people consuming untreated groundwater might be at a considerable risk of chronic arsenic poisoning.
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                Author and article information

                Journal
                Water Policy
                IWA Publishing
                1366-7017
                1996-9759
                October 01 2019
                July 31 2019
                October 01 2019
                July 31 2019
                : 21
                : 5
                : 1096-1106
                Affiliations
                [1 ]School of Geography and the Environment, University of Oxford, South Parks Road, Oxford OX1 3QY, UK
                Article
                10.2166/wp.2019.003
                be06a02d-991b-466e-b3f0-02cef2860ccb
                © 2019
                History

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