Arsenic contamination of groundwater in Nawabganj, Bangladesh, focusing on the relationship with other metals and ions
Arsenic contamination of groundwater in Nawabganj, Bangladesh, focusing on the relationship with other metals and ions
复制标题
DOI：
10.2166/wst.2005.0233
复制
发表时间：
2005-01-01
影响因子：
2.7
通讯作者：
Magara, Y
中科院分区：
文献类型：
--
作者：
Ohno, K;Furukawa, A;Magara, Y
孟加拉国的地下水受到严重砷污染的报道频繁，令人极为关切。在这项研究中，重复的水采样从相同的10管井在Nawabganj市，孟加拉国，进行了分析，重点是水质的季节性变化和砷与其他金属和离子之间的关系。从水质的季节变化来看，砷和铁的浓度总体上在雨季较高，但变化趋势并不一致，且与管井和时间有关。当使用所有气体时，在本研究中未观察到砷和铁之间的相关性（r = -0.01）。这是因为在较高砷浓度范围内未观察到相关性。通过与共存铁共沉淀去除砷被认为是孟加拉国当地适用的技术之一，但本研究的结果表明，在某些情况下，特别是在砷浓度高的情况下，应进行一些额外的处理，如额外注入铁。并对砷与其它物质的相关性进行了分析。结果表明，锰（r = 0.37）、钼（r = 0.33）和硫酸根离子（r = -0.33）与砷呈显著正相关（p < 0.05）。砷与硫酸根离子之间的负相关关系表明砷在还原条件下溶解到地下水中，尽管也有一些例外情况。
Serious arsenic contamination of groundwater in Bangladesh has been frequently reported and is of great concern. In this research, repeated water sampling from the same 10 tubewells in Nawabganj municipality, Bangladesh, was conducted and analysed, focusing on the seasonal variation of water quality and the relationship among arsenic and other metals and ions. For the seasonal variation of water quality, arsenic and iron concentrations were higher in the rainy season in general although the tendency was not consistent and it depended on the tubewell and the time. Correlation between arsenic and iron could not be observed in this study (r = -0.01) when using all Gases. This was because no correlation was observed in the higher arsenic concentration range. Arsenic removal by co-precipitation with coexisting iron is known as one of the locally applicable techniques in Bangladesh, but the result from this study suggests that some additional treatments such as the extra injection of iron should be performed in some cases, especially where the arsenic concentration is high. The correlation between arsenic and other substances was also analysed. As a result, manganese (r = 0.37), molybdenum (r = 0.33) and sulfate ion (r = -0.33) significantly correlated with arsenic (p < 0.05). The negative correlation between arsenic and sulfate ion implies the dissolution of arsenic into groundwater under reductive conditions although there are some exceptional cases.