Marsh testn.

Brit.

/ˈmɑːʃ tɛst/, U.S.

/ˈmɑrʃ ˌtɛst/

Forms: 1800s– Marsh's test, 1900s– Marsh test.

Origin: From a proper name, combined with an English element. Etymons: proper name Marsh , test n.¹

Etymology: < the name of James Marsh (1794–1846), English chemist and physicist, who devised the method in 1836 + test n.¹

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).

ΘΚΠ

the world > matter > chemistry > chemical assay or analytical chemistry > [noun] > acetimetry > assay

Marsh test1837

four-point assay1940

radioassay1945

1837 London & Edinb. Philos. Mag. 10 353 (title) On antimoniuretted hydrogen, with some remarks on Mr. Marsh's test for arsenic.

1855 J. Scoffern Elem. Chem. 479 Arseniuretted hydrogen thus employed, as a means of removing and discovering arsenic, is called Marsh's test, from its inventor, Mr. Marsh.

1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 6 This stain dissolves at once in sodium hypochlorite. (Marsh's test.)

1930 D. L. Sayers Strong Poison xx. 265 In a small apartment usually devoted to Bunter's photographic work..stood the apparatus necessary for making a Marsh's test of arsenic.

1968 Materials & Technol. I. ix. 399 Very minute quantities of arsenic can be detected by means of the Marsh test.

1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) xi. 391 The well-known Marsh test, where arsenic compounds are reduced by zinc in HCl solution.

This entry has been updated (OED Third Edition, December 2000; most recently modified version published online March 2022).

单词	marsh test
释义	Marsh testn. Brit. /ˈmɑːʃ tɛst/, U.S. /ˈmɑrʃ ˌtɛst/ Forms: 1800s– Marsh's test, 1900s– Marsh test. Origin: From a proper name, combined with an English element. Etymons: proper name Marsh , test n.¹ Etymology: < the name of James Marsh (1794–1846), English chemist and physicist, who devised the method in 1836 + test n.¹ 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). ΘΚΠ the world > matter > chemistry > chemical assay or analytical chemistry > [noun] > acetimetry > assay Marsh test1837 four-point assay1940 radioassay1945 1837 London & Edinb. Philos. Mag. 10 353 (title) On antimoniuretted hydrogen, with some remarks on Mr. Marsh's test for arsenic. 1855 J. Scoffern Elem. Chem. 479 Arseniuretted hydrogen thus employed, as a means of removing and discovering arsenic, is called Marsh's test, from its inventor, Mr. Marsh. 1906 H. J. H. Fenton Notes Qualitative Anal. (new ed.) 6 This stain dissolves at once in sodium hypochlorite. (Marsh's test.) 1930 D. L. Sayers Strong Poison xx. 265 In a small apartment usually devoted to Bunter's photographic work..stood the apparatus necessary for making a Marsh's test of arsenic. 1968 Materials & Technol. I. ix. 399 Very minute quantities of arsenic can be detected by means of the Marsh test. 1988 F. A. Cotton & G. Wilkinson Adv. Inorg. Chem. (ed. 5) xi. 391 The well-known Marsh test, where arsenic compounds are reduced by zinc in HCl solution. This entry has been updated (OED Third Edition, December 2000; most recently modified version published online March 2022). < n.1837
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