Definition of Marsh test in English:

Marsh test

(also Marsh's test)

noun

Chemistry
  • A sensitive test for the presence of arsenic, in which nascent hydrogen generated by the addition of hydrochloric acid and zinc is used to reduce any arsenic in a sample to the gas arsine, which is then converted by heat to a brown deposit of metallic arsenic (distinguishable from the similar stain given by antimony by its solubility in sodium hypochlorite solution).

Origin

Mid 19th century; earliest use found in London and Edinburgh Philosophical Magazine. From the name of James Marsh, English chemist and physicist, who devised the method in 1836 + test.

Pronunciation

Marsh test

/ˈmɑːʃ tɛst/