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沈荣 《安徽职业技术学院学报》2003,2(1):13-18
在表面活性剂溶液中 ,活性剂分子长碳链相互缠绕折叠形成若干微电场 ,带异性电荷的染料分子被吸附 ,使溶液吸收光谱红移。本研究利用微相吸附—光谱修正 (MPASC)技术以十二烷基苯磺酸钠(SDBS)与染料夜蓝 (NB)结合反应为例研究表面活性剂在微量分析中的增效机理 ,结果表明二者的作用实质上是表面活性剂缠绕大分子内微电场对NB的Langmuir单分子层吸附。本报告测定了SDBS与NB结合产物性质 ,如结合比、单体摩尔吸光系数值等 ,而且定量分析了实际样品中的阴离子表面活性剂 ,回收率 97.9% ,RSD <3.1%。 相似文献
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Cecil R. Reynolds Ralph D. McBride Lu Juan Gibson 《Contemporary educational psychology》1981,6(2):180-184
WPPSI and McCarthy Scales subtests were ranked by members of the National Academy of Neuropsychology according to relative reliance on left-cerebral-hemisphere function. Pairs of blacks and whites matched for a variety of demographic variables were administered the WPPSI (132 pairs) and the McCarthy Scales (148 pairs). Difference scores were calculated, in standard score units, for each WPPSI and McCarthy subtest. A pattern of positive correlation occurred between the size of black-white differences and the judged degree of left-hemisphere involvement in the task, suggesting that black-white IQ discrepancies may be partially explained by differences in hemisphericity. 相似文献
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