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By H. N. Wilson

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Sample text

Therefore the food analysts had to devote much attention to the accumulation of information on the properties of genuine examples. The determination of sugars, including mannitol, esters, acids especially tartaric acid, ethanol and higher alcohols, and " extractives " are all important. Added colours (logwood, Brazil wood, and cochineal) were identified by spectroscopy as early as 1876 by Dupré. Traces of dangerous metals, lead in claret, zinc—derived from a fining process using ferrocyanide and zinc sulphate—in Moselle, to say nothing of arsenic in beer, have been responsible for much analytical activity.

3 molar. Bivalent platinum also forms a (more soluble) compound, which'may 'contaminate the precipitate. As in the case of nickel, the colour of the a-furyl dioxime dissolved in chloroform is about ten times as intense (at 380 mjLt) as the dimethyl compound. Dimethylglyoxime has been known as a reagent for palladium since 1913. CUPFERRON Some use was made of certain organic bases towards the end of the last century, the most important was Phenylhydrazine. They were used to precipitate such hydroxides as iron and aluminium and separate themfrommetalhydroxidesthatneeded ahigherpH valuefor precipitation.

Ilinsky and von Knorre also made the analogous ferric salt -black, a very soluble manganous salt, and a brown-yellow nickel analogue. Publications continued to appear, by many authors, for many years; when there is a steady flow of papers about a method or reagent it is because the reagent—probably the best there is—is not very good. And α-nitroso-ß-naphthol is not very good; it is not even selective. Besides cobalt, it precipitates from a slightly acid solution a whole string of other elements including copper, palladium, iron, uranium, chromium, vanadium and bismuth.

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