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Reactions of salicylate with uranium(VI) and cobalt(II)-allylamine complex. Micro detection of uranium (VI) and salicylate

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Summary

An aqueous solution of Na-salicylate(I) gives an orange-red colour with U(VI) at pH ∼7. Both U(VI) and salicylate can be detected by this test (the limits of detection are 45μg and 25μg resp. in 0.05 ml). A red-orange precipitate is formed whenI is treated with U(VI) in presence ofα, α′-dipyridyl at pH ∼7. Thus, 200μg U(VI) (in 0.5 ml) and 6μg salicylate (in 0.05 ml) can be detected. In the test for U, Fe(III), Ru(III), Cr(III), Ce(IV), Cu(II), [Fe(CN)6]4−, [Fe(CN)6]3−, F, C2O4 2−, citrate, and tartrate interfere. The latter three anions also interfere in the tests for salicylate. Formate, acetate, succinate, benzoate, and acetylsalicylate do not interfere. Allylamine(II) gives a deep green precipitate with Co(II); however, if salicylate is added to Co(II) and the mixture is treated withII, a bluish-violet precipitate is produced. This forms the basis of salicylate detection (1 mg/0.25 ml). Oxalate, citrate, tartrate, and sulfosalicylate interfere. The nature of products formed in these tests has been discussed.

Zusammenfassung

Eine wäßrige Na-Salicylatlösung (I) gibt mit U(VI) bei pH 7 eine orangerote Farbe. Sowohl U(VI) wie I können damit nachgewiesen werden (Erf. Grenze 45 bzw. 25μg in 0,05 ml). I gibt mit U(VI) in Gegenwart von α,α-Dipyridyl bei pH 7 einen rot-orangen Niederschlag. So können 200μg U(VI)/0,5 ml bzw. 6μg Salicylat/0,05 ml nachgewiesen werden. Der U-Nachweis wird von Fe(III), Ru(III), Cr(III), Ce(IV), Cu(II), [Fe(CN6]4−, [Fe(CN)6]3−, F, C2O4 2−, Citrat und Tartrat gestört. Die 3 letztgenannten Anionen stören auch den Nachweis von I. Formiat, Acetat, Succinat, Benzoat und Acetylsalicylat stören nicht. Allylamin(II) gibt einen tief grünen Niederschlag mit Co(II); wird aber I dem Co(II) zugesetzt und das Gemisch mit II versetzt, so wird ein blauvioletter Niederschlag gebildet. Auf dieser Grundlage kann I nachgewiesen werden (1 mg/0,25 ml). Oxalat, Citrat, Tartrat und Sulfosalicylat stören. Die Zusammensetzung der Reaktionsprodukte wurde erörtert.

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Johar, G.S. Reactions of salicylate with uranium(VI) and cobalt(II)-allylamine complex. Micro detection of uranium (VI) and salicylate. Mikrochim Acta 62, 743–750 (1974). https://doi.org/10.1007/BF01218214

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