Abstract
The so-called Fleitmann test of reducing arsenic to hydrogen arsenide by aluminum in caustic alkaline medium is advantageous in that it avoids formation of hydrogen sulfide, hydrogen antimonide, or hydrogen phosphide that is inevitable by reduction in acid medium. The use of zinc as the reducing agent in alkaline medium, report on which has not been found in the past 20 years although such use in acid medium has been described often, was examined. The detection of hydrogen arsenide was made by paper chromatography by spraying 5% silver nitrate solution and the recognizable limit of arsenic was found to be 0.1 γ in 0.2cc., and its limiting concentration to be 1:2, 000, 000. These values indicated good sensitivity compared with other methods of detecting arsenic.
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