Sensitizing Effect of Mixed Surfactants on the Colouration of Scandium(Ⅲ)with Phenylfluorone or Its Derivatives
来源期刊：Rare Metals1992年第2期
论文作者：陈华序 邹凤君 王玉兴
文章页码：135 - 142
摘 要：<正> In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium（Ⅲ）with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoricsystem tolerates the existence of a considerable amount of masking agents,so that many interfering ions can bemasked and its selectivity would be further improved.After studying the optimum conditions and main charac-ters of some similar systems,the system of Sc（Ⅲ）—Orthonitrophenyuorone—CetyltrimethylammoniumBromide（CTMAB）—Triton X-200 is chosen for the spectrophotometric determination of microamount ofscandium.The proposed method shows not only high sensitivity(with a molar absorptivity of 2.12×1sLmol-1·cm-1)and selectivity,but also high tolerance of chromophoric conditions.Beer’s law is obeyed over arange of 0～6.0 μg Sc/25ml.If the dual-wavelength method is applied,a much higher molar absorptivity o|"3.04×105L·mol-1·cm-1than those of other systems ever reported in the literatures can be attained:more-over.its linear range is extended to 0～8.0 μg Sc/25ml and its reproducibility is also improved.
陈华序，邹凤君，王玉兴
摘 要：<正> In the presence of mixed micelle of a cationic and a nonionic surfactants,the reaction of scandium（Ⅲ）with phenylfluorone or its derivatives results in a very sensitive colouration:furthermore this chromophoricsystem tolerates the existence of a considerable amount of masking agents,so that many interfering ions can bemasked and its selectivity would be further improved.After studying the optimum conditions and main charac-ters of some similar systems,the system of Sc（Ⅲ）—Orthonitrophenyuorone—CetyltrimethylammoniumBromide（CTMAB）—Triton X-200 is chosen for the spectrophotometric determination of microamount ofscandium.The proposed method shows not only high sensitivity(with a molar absorptivity of 2.12×1sLmol-1·cm-1)and selectivity,but also high tolerance of chromophoric conditions.Beer’s law is obeyed over arange of 0～6.0 μg Sc/25ml.If the dual-wavelength method is applied,a much higher molar absorptivity o|"3.04×105L·mol-1·cm-1than those of other systems ever reported in the literatures can be attained:more-over.its linear range is extended to 0～8.0 μg Sc/25ml and its reproducibility is also improved.
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