Marsh test

(redirected from Marsh, James)
Also found in: Medical.

Marsh test,

method for the detection of arsenicarsenic
, a semimetallic chemical element; symbol As; at. no. 33; at. wt. 74.92160; m.p. 817°C; (at 28 atmospheres pressure); sublimation point 613°C;; sp. gr. (stable form) 5.73; valence −3, 0, +3, or +5.
..... Click the link for more information.
, so sensitive that it can be used to detect minute amounts of arsenic in foods (the residue of fruit spray) or in stomach contents. The sample is placed in a flask with arsenic-free zinc and sulfuric acid. Arsine gas (also hydrogen) forms and is led through a drying tube to a hard glass tube in which it is heated. The arsenic is deposited as a "mirror" just beyond the heated area and on any cold surface held in the burning gas emanating from the jet. Antimony gives a similar test, but the deposit is insoluble in sodium hypochlorite, whereas arsenic will dissolve. The test was named for its inventor, the English chemist James Marsh.

Marsh test

[′märsh ‚test]
(analytical chemistry)
A test for the presence of arsenic in a compound; the substance to be tested is mixed with granular zinc, and dilute hydrochloric acid is added to the mixture; gaseous arsine forms, which decomposes to a black deposit of arsenic, when the gas is passed through a heated glass tube. Also known as Marsh-Berzelius test.
References in periodicals archive ?
Early risers pictured outside their tent were (back, from left) Robert Topham, of Marsh, James Hughes, of Slaithwaite, and James Wright, of Bolster Moor, with (front, from left) James Hall of Slaithwaite, Tony Goldsetin of Milnsbridge and Andrew Brierley, of Paddock.
Coventry squad: Troy Brophy, Jamahl Hunte, Dan Parker, Eddie Medforth, Josh Guzdek, Billy Sheen, Matthew Marsh, James Geurtjens, Alex Brown, Tom Hal, Liam Thompson, Chris Barratt, Simon Phillips, Connor Robinson, Matt Reid, Matt Cooper, Steve Coleman.
At the same time Mitchell Marsh, James Faulkner and Brad Haddin are dangerous hitter in the last overs.
Australia has three members of a 15-man tour party with injury concerns ahead of the departure for South Africa this week, including batsman Marsh, James Faulkner and Jackson Bird, News.
Carolyn Hughes reports from the latest lunches, launches and parties Sugababe Keisha Buchanan at the Jacques Townhouse Picture: DAVE NELSON Sandra Gee (Sefton Chamber of Commerce) and Gill Fell (Impact PR), at the Frank Network event Designer and stylist Samantha Chong, at the Jacques Townhouse John Boldersson (Independent Banking and Finance Consultants) and friend, at the Silverberg party Kylie Lawson, Rachael Lee-Garrett and Katie Tunn, at the Jacques Townhouse Picture: DAVE NELSON Luke Trevaskis, Martine Silverberg and Irvine Larrier, at the Silverberg Hawaiian party Janet Marsh, James Williamson (JW Interiors), Elle Beyga (Verve) and Leila Qotbi Sinjab (Birkdale Dental Clinic), at the Frank Network event, in Southport * KEEP up with Carolyn's party schedule at www.
And Bet365's offer of 5-6 about Kings XI hitting most sixes looks great value with Shaun Marsh, James Hopes, Yuvraj and Shikar Dharwan all in maximum mood.
Goals from Marsh, James, Thomas and a Fineschi penalty did the trick.
Front: Tom Croucher, Ray Robinson, Corey Ledder, Joe Marsh, James Reddin-Carruthers, Jake Worthington, Yannis Switzer, Shaun Walsh.