GARCIA-VARGAS et aZ. : AAS FOR DETERMINATION OF ArtaZyst, VoZ. 108 1.1.3. Heteropolyacid compounds : determination of phosphate 1.1.3.1. Binary heteropolyacids 1.1.3.1.a. Single extraction 1.1.3.1 .b. Extractiondecomposition 1.1.3.1 .c. Precipitation of molybdophosphoric acid 1.1.3.2. Ternary heteropolyacids 1.1.4. Redox reactions 1.1.4.1. Inorganic anions : determinations of iodide, iodate, nitrate and chlorate 1.1.4.2. Organic compounds 1.2. Methods based on the formation of compounds in the atomisation cell 1.2.1. Suppression or enhancement of the atomic-absorption signal of a metal 1.2.1.1. Constant concentration of the metal added 1.2.1.1 .a. Alkali metals : determination of fluorine 1.2.1.1 .b. Alkaline earth metals : determinations of phosphate, sulphate, fluoride and organic compounds 1.2.1.1 .c. Transition metals : determinations of fluoride, sulphate and ammonia Variable concentration of the metal added 1.2.1 .%a. Atomic-absorption inhibition titration : determinations of sulphate and phosphate 1.2.1.2.b. Atomic-absorption inhibitionrelease titration : determination of fluoride Molecular-absorption spectrometry : determination of halogens 1.2.1.2. 1.2.2. 1.3. Methods based on the formation of volatile compounds: determination of halogens 2. Direct methods 2.1. Non-metallic elements 2.1.1, Flame methods 2.1.1.1. Atomic-absorption spectroscopy : determinations 2.1.1.2. Molecular-absorption spectroscopy : determinations 2.1.2. Electrothermal methods : determinations of phosphorus, of phosphorus, sulphur and iodine of phosphorus and sulphur sulphur and iodine 2.2. Organic compounds 3. Conclusions
The properties of 2,6-diacetylpyridine bis(2-hydroxybenzoylhydrazone) (DAPBSH) and 2,6-diacetylpyridine bis(benzoy1hydrazone) (DAPBBH) are described. The reaction between Sb(l1l) ions and DAPBBH has been studied spectrophotometrically and the resulting orangeyellow Sb -DAPBBH complex extracted into 3-methylbutan-I -01 ( E = 1.13 x lo4 I mol-1 cm-I at 405 nm) from pH 0.5 to 5.3. The Sandell sensitivity is 0,001 1 pg cm-* in 50 ml of aqueous solution. The method described is highly selective and has been applied satisfactorily to the determination of antimony in non-ferrous alloys.
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