D0I:10.13374/i.issn1001-053x.1991.04.03M 北京科技大学学报 第13宿第4(【)期 Vol.13 No.4(I) 1991年7月 Journal of University of Science and Technology Beijing July 1991 Influence of Mixed Micelle on the Sensitized Coordination Compound of Gallium(IⅢ）with o-Chlorophenylfluo- rone and Its Analytical Application Chen Huaxu Shao Guangdi Xia Xinlong' (陈华序) (邵光约) (夏心龙) ABSTRACT:After comparing the sensitizing effect of various mixed surfactants on the chromophoric reaction of gallium (with orthochlorophenylfluorone, it has been found that the mixed micelle of cetyltrimethylammonium bromide and Tween-80 is most suitable.In the presence of this mixed micelle,not only both the sensitivity and stability improve markedly,but also a wider pH range is tolerable for the colour-development.From the study on the optimum conditions for the formation of the coloured coordination compound in the system of (Ga (I)-o-Chlorophenyl fluorone-catyltrimethylammo- nium bromide-Tween-80>and its main characters,a spectrophotometric method,by which.sensitivity and reproducibility are higher than those of ternary systems of gallium(I)has been developed.When it is combined with the dual-wavelength method,the molar absorptivity can be improved to 2.33x 1051.mol-1.cm-1,which is higher than that of most of other systems ever shown in the literatures;moreover the linear range is extended.From the determination of microamount of gallium in the copper minerals,the result is proved to be acceptable. KEY WORDS:gallium,orthochlorophenylfluorone,cetyltrimethylammonium bro- mide,mixed micelle,sensitization Although many reports concerning the chromophoric system of gallium(H) have been published in recent years,most of them are ternary systems of (Ga 1991一03一04收稿 ,化学系(Department of Chemistry) 385第 卷第 期 年 月 北 京 科 技 大 学 学 报 了 一 “ ， 夕 ， ， 夕 ， 陈华序 邵光均 夏心龙 ， 一 ， 了 ， 一 — 一 一 — 一 》 ， ， · 住 一 ， 一 一 一 ， “ ， · ， ， ， ， ， 《 一 一 收稿 ， 化学 系 DOI ：10．13374／j ．issn1001—053x．1991．04．034