| 释义 |
Marsh2
The name of James Marsh (1794–1846), British chemist, used in the possessive and attrib. to designate a sensitive test for the presence of arsenic in a substance (published by him in 1836), in which the substance is subjected to the action of nascent hydrogen so that any arsenic in it forms the gas arsine, which may be detected by decomposing it (e.g. by passing it through a heated glass tube) and looking for a dark stain of arsenic (distinguishable from a similar stain given by antimony by its solubility in sodium hypochlorite solution).
1855J. 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. 1930D. 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. 1968Materials & Technol. I. ix. 399 Very minute quantities of arsenic can be detected by means of the Marsh test. |