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行尸走肉什么时候更新Solvent Donicity Influence in the Fluorescencesurvey是什么意思
investigateEmission of the Lithium/1,4-Dihydroxyanthraquinone System. Improvement in the Quantification of Lithium.
期刊名称： Analytical Letters
google翻译作者： Rodríguez, Luis Cuadros,Linares, Carlos Jiménez,Ceba, Manuel Román
daring年份： 1997年
英语练习册答案
一对一托福外教期号： 第4期
关键词： Solvent donicity;spectrofluorimetry;1,4-dihydroxyanthraquinone;lithium determination;ion pair英文网站
摘要：The fluorescence emission from the lithium/1,4-dihydroxyanthraquinone system shows a great enhancement in the prence of certain water-miscible solvents. This is justified from the donicity (nucleophilic properties) of the solvent that facilitates the solvation of the lithium cation in solution and t
he stabilization of an nondissociated ion-pair between the solvated lithium cation and the 1,4-dihydroxyanthraquinonate anion. A very nsitive analytical method was propod for the spectrofluorimetric determination of lithium bad on its reaction with 1,4-dihydroxyanthraquinone (quinizarin) in a dimethylsulfoxide medium (90%) and in prence of sodium hydroxide. The fluorescence is measured at an excitation wavelength of 602 nm and an emission wavelength of 670 nm and it is stable at 25°C at least 6 h. The calibration curve
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