Gutzeit Test

Analysis of zinc solutions at the purification stage before electrolysis is critical and several metals present in low concentrations are monitored carefully. Methods vary from plant to plant but are highly specific and usually capable of detecting 0.1 ppm or less. Colorimetric process-control methods are used for cobalt, antimony, and germanium, turbidimetric methods for cadmium and copper. Alternatively, cadmium, cobalt, and copper are determined polarographicaHy, arsenic and antimony by a modified Gutzeit test, and nickel with a dimethylglyoxime spot test. [Pg.410]

Theory The official process is a development of the Gutzeit Test wherein all arsenic present is duly converted into arsine gas (AsH3) by subjecting it to reduction with zinc and hydrochloric acid. Further, it depends upon the fact that when arsine comes into contact with dry paper permeated with mercuric (Hg2+) chloride it produces a yellow strain, the intensity of which is directly proportional to the quantity of arsenic present. The various chemical reactions involved may be expressed by the following equations ... [Pg.26]

Gutzeit test analy chem A test for arsenic zinc and dilute sulfuric acid are added to the substance, which is then covered with a filter paper moistened with mercuric chloride solution a yellow spot forms on the paper if arsenic is in the sample. gut,sTt, test ... [Pg.172]

The Gutzeit Test.3—This test is as accurate as the Marsh test and the apparatus necessary is comparatively simple. It consists in allowing the arsine to react with strips or discs of dry filter paper impregnated with silver nitrate or, in the more recent modifications of the method, mercuric chloride or bromide. [Pg.319]

The sensitivity of the Gutzeit test varies with the conditions. Variation in the humidity of the gas should be avoided.8 Under ordinary laboratory conditions 10-6 g. of As may be detected, but amounts of 1, 2 and 3 x 10-6 g. are not easily differentiated.9 If the quantity of arsenic in the aliquot test portion is as much as 0-04 mg. the comparison of the stains is not satisfactory.10 It has been observed that arsenic stains which are invisible to the naked eye become strikingly visible under ultraviolet rays.11... [Pg.320]

Estimation Gravimetrically as Sulphide as Magnesium Pyroarsenate—Volu-metrically by Iodometric Methods with Potassium Bromate, etc.—The Marsh Test—The Gutzeit Test—Fleitmann s Test—Colorimetric Methods— Microohemioal Methods—Determination of Arsenic in Gases. [Pg.366]

Stibine. Sbl h, is formed by hydrolysis of some metal antimonides or reduction (with hydrogen produced by addition of zinc and HC1) of antimony compounds, as in the Gutzeit test. It is decomposed by aqueous bases, in contrast with arsine. It reacts with metals at higher temperatures to give the antimonides. The antimonides of elements of group la. 2a, and 3a usually are stoichiometric, with antimony trivalent. With other metals, the binary compounds are essentially intermetallic. with such exceptions as the nickel series, Ni. Sb.. NiSb, Ni5Sb2 and Ni4Sb. [Pg.138]

Note Small amounts of antimony can be identified using the Marsh or Gutzeit test (see references at the beginning of this section for details)... [Pg.537]

Zinc and dilute sulphuric acid Phosphites are reduced by the nascent hydrogen to phosphine, PH3, which may be identified as described in the Gutzeit test under Arsenic (Section III.14) the silver nitrate paper is stained first yellow and then black. [Pg.359]

May contain undissolved MoS3. Dissolve in concentrated HO and Br2 water, and boil to expel Br2. Test for Mo by the NH4SCN-SnCl2 reaction. May contain As and some of the Mo. Identify As as in Table V. 18 in Section V.12 or by the Gutzeit test (Section III.14). Identify Mo thus acidify a portion of the filtrate with dilute HC1 and add a little solid potassium xanthate. A red-purple colouration confirms Mo. ... [Pg.526]

Fleitmann s test this test depends upon the fact that nascent hydrogen generated in alkaline solution, e.g. from aluminium or zinc and sodium hydroxide solution, reduces arsenic(III) compounds to arsine, but does not affect antimony compounds. A method of distinguishing arsenic and antimony compounds is thus provided. Arsenates must first be reduced to the tervalent state before applying the test. The modus operandi is as for the Gutzeit test, except that zinc or aluminium and sodium hydroxide solution... [Pg.98]

Determinations of very small amoxmts of arsenic, such as 0.1 mg or less, were traditionally done with the Marsh test or the Gutzeit test invented in the late nineteenth century. Method (a) of the European Pharmacopoeia can be considered a modified Gutzeit test, but whereas this originally used silver nitrate or mercury(II)chloride to detect any arsenic present, method (a) uses mercury(II)bromide. [Pg.107]

Gutzeit test n. Method for testing and estimating small quantities of arsenic and antimony in other materials. Details are given in the British pharmacopoeia. [Pg.476]

Elemental arsenic and antimony react in acid milieu with nascent hydrogen to yield the respective volatile hydrides. Both of these products give a positive response to the Gutzeit test (see page 113). However, in alkaline milieu, only arsine is formed. The following test requires the absence of inorganic and organic arsenic compounds. [Pg.111]

Reduction of arsenious acid to arsine. In acid solutions, arsine is formed by the action of nascent hydrogen on either arsenic pentoxide or trioxide. The gas can be detected by the "Gutzeit" test (see page 113). However, in alkaline media, such as sodium hydroxide solution, only arsenites are reduced to arsine by metallic aluminum, while arsenates remain unchanged. [Pg.116]

The Marsh-Gutzeit Test Arsenic, from all of its soluble compounds, is reduced (by nascent hydrogen ) in acidic solution to arsane, ASH3, a colorless gas smelling like garlic ... [Pg.391]

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