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Marsh test

n :  a sensitive test for arsenic in which a solution to be tested is treated with hydrogen so that if arsenic is present gaseous arsine is formed and then decomposed to a black deposit of arsenic (as when the gas is passed through a heated glass tube)
 
Marsh, James Ernest (1794-1846),
British chemist. Marsh spent considerable time studying poisons and their effects. He introduced his test for arsenic in 1836.
 
 

 
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