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|Section2= |Section3= |Section5= |Section6= |Section7= |Section8= }} Arsenic trioxide is an inorganic compound with the formula . This commercially important oxide of arsenic is the main precursor to other arsenic compounds, including organoarsenic compounds. Approximately 50,000 tonnes are produced annually. Many applications are controversial given the high toxicity of arsenic compounds. ==Production and occurrence== Arsenic trioxide can be generated via routine processing of arsenic compounds including the oxidation (combustion) of arsenic and arsenic-containing minerals in air. Illustrative is the roasting of orpiment, a typical arsenic sulfide ore. :2 + 9 → 2 + 6 Most arsenic oxide is, however, obtained as a volatile by-product of the processing of other ores. For example, arsenopyrite, a common impurity in gold- and copper-containing ores, liberates arsenic trioxide upon heating in air. The processing of such minerals has led to numerous cases of poisonings.〔(【引用サイトリンク】 Giant Mine – Northwest Territories Region – Indian and Northern Affairs Canada )〕 Only in China are arsenic ores intentionally mined.〔 In the laboratory, it is prepared by hydrolysis of arsenic trichloride:〔 :2 AsCl3 + 3 H2O → As2O3 + 6 HCl occurs naturally as two minerals, arsenolite (cubic) and claudetite (monoclinic). Both are relatively rare secondary minerals found in oxidation zones of As-rich ore deposits. 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 trioxide」の詳細全文を読む スポンサード リンク
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