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Analytical Chemistry of Molybdenum and Tungsten. Including - download pdf or read online

By W. T. Elwell

ISBN-10: 0080166733

ISBN-13: 9780080166735

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Additional info for Analytical Chemistry of Molybdenum and Tungsten. Including the Analysis of the Metals and Their Alloys

Sample text

The precipitate is collected, washed with sulphuric acid (1 + 2 0 ) saturated with hydrogen sulphide, gently calcined in an iron crucible, then fused with sodium peroxide. The determination of tin can be completed by the usual iodimetric method. FROM ARSENIC AND PHOSPHORUS Both arsenic and phosphorus can be precipitated by magnesia mixture from an ammoniacal solution; tungsten remains in solution. The finely ground sample (1 g) is fused with 2 to 3 g of sodium hydroxide, the cooled melt is dissolved in water, and the solution is boiled for 30 minutes.

Tungsten, vanadium, rhenium, and iron are co-extracted. ^ A study of the extraction of molybdenum, by Nelidow and Diamond,^^"^^ showed that tri-butyl phosphate is a suitable reagent when the extraction is made from a 1 to 2 Μ hydro­ chloric acid solution. 1 Μ in kerosine) containing 2 per cent, of capryl alcohol. 85. ^^^^ Molybdenum 8-hydroxyquinolate can be extracted into chloroform. 55 and diluted to about 100 ml. The hydroxyquinolate is then formed and extracted by shaking for 2 minutes with two separate 10-ml amounts of a 1 per cent, solution of 8-hydroxyquinohne in chloroform.

Chim. Acta, 1967,37,402. ) 138. ZHAROVSKII, F. , VYAZOVSKAYA, L. , and KosTovA, R. , Ukr. khim. , 1968,34, 181. ) 139. , Sepn. , 1968, 3, 103. ) 140. , TaIanta, 1968, 15, 221. ) 141. , Z. , 1968, 8, 235. ) 141a. BusEv, A. , and FROLKINA, V. , Zh. , 19GD, 1969 (17), Abstr. No. 17G28. ) 141b. BusEv, A. , and RODIONOVA, T. , Analyt. , 1969,2,9. ) 142. RUDENKO, N. , KHADI KAnoM AVAD, KuzNETzov, V. , and GUDYM, L. , Vest. mosk. gos. , 1968 (5), 36. ) 143. , Talanta, 1969, 16, 1590. ) 144. TITOV, P. , Zh.

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Analytical Chemistry of Molybdenum and Tungsten. Including the Analysis of the Metals and Their Alloys by W. T. Elwell

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