标题：SELECTIVE DETERMINATION OF HOLMIUM IN RARE EARTH MIXTURES BY SECOND-DERIVATIVE SPECTROPHOTOMETRY WITH BENZOYLINDAN-1,3-DIONE AND CETYLPYRIDINIUM CHLORIDE
作者：Wang NX.;Jiang W.;Qi ZC.;Si ZK.
作者机构：[Wang, N.-X] Department of Chemistry, Shandong University, Jinan, 250100, China;[ Si, Z.-K] Department of Chemistry, Shandong University, Jinan, 25010 更多
会议名称：2nd International Symposium on Modern Principles of Air Monitoring (AIRMON 96)
会议日期：FEB 05-08, 1996
来源：The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry
关键词：Holmium determination;Deterivative spectrophotometry;Benzoylindan-1;3-dione;4f electron transitions;Absorption-spectra;3rd-derivative spectrophotometry;Neodymium;Erbium;Spectroscopy;Diethylamine
摘要：The absorption spectra of 4f electron transitions of the holmium complex with benzoylindan-1,3-dione and cetylpyridinium chloride were studied by conventional and derivative spectrophotometry, The molar absorptivity of the complex at the maximum absorption band was about 22 times greater (at 450 nm) than that in the absence of the complexing agent, The use of second-derivative spectra both eliminates the interference from other rare earths and improves the sensitivity for holmium, The calibration graph showed that the complex obeys Beer\'s law up to 25 mu g cm(-3) of holmium, The corresponding value of Sandell\'s sensitivity is 0.36 mu g cm(-2). The RSD evaluated from 11 independent determinations of 10 mu g of holmium is 0.96%, The detection limit, obtained from the sensitivity of the calibration graph and for 3s(b) (s(b) = standard deviation of a blank without holmium, n = 11), was found to be 0.43 mg dm(-3) of holmium. The quantification limit, obtained for 10s(b), was 1.43 mu g cm(-3) of holmium, A method for the direct determination of holmium in rare earth mixtures with good selectivity and accuracy is described. [References: 19]