天然産硫化砒素の簡単な検出法

概要

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Simple methods of detection of arsenic sulfides, such as found in the precipitate of hot spring, are investigated; samples containing large amount of sulfur, such as flower of sulfur, are taken for finding the methods to be carried out in field test in a short time.<BR>The following three methods gave satisfactory results.<BR>(1) Heating of acidified silver nitrate solution and sample gives black coloration in the presence of arsenic and the presence of sulfur does not interfere the coloration. (2) Arsenic sulfide is reprecipitated by treating the sample with ammonia and nitric acid, and the coloration with silver nitrate solution is applied for an approximate estimation of arsenic in samples containing comparatively large amount of arsenic.<BR>(3) Detection of arsenic by the formation of silver arsenate. All of the above three methods are suitable for field test in a short time, among which (1) gives the highest sensitivity, (2) is possible for estimation of approximate content, and (3) is suitable for directive detection of arsenic; the combined use of these three methods is necessary in some cases to give effective result.
社団法人日本分析化学会の論文