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(organic chemistry)
(CH3)2C2(NOH)2 White, crystalline or powdered solid, used in analytical chemistry as a reagent for nickel.



diacetyl dioxime:

Colorless crystals; melting point, 238°-240°C. It is soluble in alcohol, ether, and solutions of alkalies. With nickel salts it yields a red insoluble precipitate of nickel dimethylglyoximate, (C4H7O2N)2Ni, which is a chelate compound. Because of this, dimethylglyoxime is used for the qualitative and quantitative determination of nickel. In 1905, L. A. Chugaev suggested the use of dimethylglyoxime as a specific reagent for nickel. Dimethylglyoxime is made by treating diacetyl with hydroxylamine.

References in periodicals archive ?
Both dimethylglyoxime test and ICP-MS measurements confirmed that the porous structure of Mn12 promotes fast and complete nickel ion capturing.
They tested inexpensive jewelry and hair clasps for nickel release using the dimethylglyoxime test.
Metal objects can be tested for nickel content by using a cotton-tipped applicator to apply a few drops of dimethylglyoxime in ammonium hydroxide to the object.
Many people concerned with establishing nickel release use the Nickel DMG (Dimethylglyoxime) test in preference to the EN 1811 test method, because it is largely non-destructive and offers both cost and time savings.
The dimethylglyoxime spot test is very useful for patients who are nickel allergic.
Nickel is quantified by formation of a dimethylglyoxime complex with ammonium chloride buffer and iron and copper determined simultaneously using catechol with piperazinebis (ethanesuiphonic acid) buffer.