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Arsenic contamination of groundwater is a form of groundwater pollution which is often due to naturally occurring high concentrations of arsenic in deeper levels of groundwater. It is a high-profile problem due to the use of deep tubewells for water supply in the Ganges Delta, causing serious arsenic poisoning to large numbers of people. A 2007 study found that over 137 million people in more than 70 countries are probably affected by arsenic poisoning of drinking water.〔See: * ("Arsenic in drinking water seen as threat," ) ''USAToday.com'', August 30, 2007. * See page 6 of: Peter Ravenscroft, ("Predicting the global distribution of arsenic pollution in groundwater." ) Paper presented at: ("Arsenic -- The Geography of a Global Problem," ) Royal Geographic Society Arsenic Conference held at: Royal Geographic Society, London, England, August 29, 2007. This conference is part of (The Cambridge Arsenic Project ).〕 Arsenic contamination of ground water is found in many countries throughout the world, including the USA. Approximately 20 major incidents of groundwater arsenic contamination have been reported.〔 〕 Of these, four major incidents occurred in Asia, in Thailand, Taiwan, and Mainland China. ==Speciation of arsenic compounds in water== Arsenic contaminated water typically contains arsenous acid and arsenic acid or their derivatives. Their names as "acids" is a formality, these species are not aggressive acids but are merely the soluble forms of arsenic near neutral pH. These compounds are extracted from the underlying rocks that surround the aquifer. Arsenic acid tends to exist as the ions ()2− and ()− in neutral water, whereas arsenous acid is not ionized. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「arsenic contamination of groundwater」の詳細全文を読む スポンサード リンク
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