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《Chemical Research In Chinese Universities》 1983-03
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SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATIONS OF LIGHT RARE EARTH ELEMENTS La, Pr, Nd, Sm

Kang Jianshi(Department of Chemical Engineering, Hunan University, Changsha)Zhang Maosen(Department of Modern Chemistry, China University of Science and Technology, Hefei)  
The error of results in simultaneous spectrophotometric determination is discussed. The condition number of the coefficient matrix has a great effect on the calculated results. For an ill-conditionned matrix, you can not ensure reliable results by use of a non-negative contraint. In these conditions, addition of stricter constraint is necessary.A new constrained optimization, the improved alternating variate method is described. By this method it is possible to add arbitrary constraints for any variate, and it is found satisfactory to the systems in which the condition number of coefficent matrix is larger.The method is applied successfully to the simultaneous spectrophotometric determination of light rare earth elements La, Pr, Nd, Sm. Using the data of general accuracy (experimental erroe≤3%), and satisfactory results can be obtained.Applying two systems in measurement(using chloro-phosphonazo and carboxynitrazo as chromogenic reagents) is suggested to improve the condition number of the coefficient matrix.
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【Co-citations】
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9 Yu Shaoming; Lu Yaling;STUDY ON SIMULTANEOUS PHOTOMETRIC DETERMINATION OF TUNGSTEN AND MOLYBDENUM WITH PV CHROMOGENIC SYSTEM[J];JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE);1996-S1
10 Mao Dongsen; Zhang Guoying ;Chen Tingyue(Department of Chemistry& Chemical Engineering,Shanghai University of Tehnology, Shanghai,200072);THE SiIMULTANEOUS SPECTROPHOT-METRIC DETERMINATION OF COPPER,COBALT AND NICKEL IN THEIR MIXTURES BY FIA pH GRADOENT TECHNIQUE AND KALMAN FILTER[J];CHEMICAL RESEARCH AND APPLICATION;1994-02
【Co-references】
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1 Sun Shusheng Department of Chemistry;Studies on Colour Reactions of Bare Earth Elements with Eriochrome Azurol B, 1,10-Phenanthroline and Cetyltrimethyl Ammonium Bromide[J];Acta Scicentiarum Naturalum Universitis Pekinesis;1984-02
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9 Wang Fangru (Sichuan Metallurgical Geological Institute)Shi Ronghua (Sichuan Institute of Metallurgical Information and Standard);Composition of the Ternary Complex Titanium-Chromotropic Acid-Diantipyrylmethane and Its Applications to Ore Analysis[J];Chinese Journal of Analytical Chemistry;1982-05
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