茜素红S和Triton X-100分光光度法测定镧在水样和尿液中的应用

Ahmad G. Ismael, Salim J. Mohammed
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引用次数: 0

摘要

该方法涉及开发一种高灵敏度分光光度法程序来估计水介质中的镧。在中性表面活性剂(Triton X-100)存在下,用茜素红S作为显色剂处理镧。在pH4.5条件下,生成了可溶性红色配合物,并在523nm处出现了最大吸收峰。在0.125 ~ 10.0µg的浓度范围内,校准图呈线性,符合比尔定律。ml -1,测定系数(r2 =0.9994)。配合物La-ARS的表观摩尔吸光度为0.7222 × 10.4 l.mol -1 .cm -1,对应于桑德尔指数的灵敏度为1910.0µg。Cm -2。对配合物的化学计量学进行了研究,结果表明配合物的化学计量学比为1:2 (La: ARS)。定量限、定量限和回收率范围分别为0.04182、0.04434µg。Ml -1和96.1% ~ 103.5%。精密度(RSD)也进行了计算,发现在0.469至1.612的范围内。该方法已成功地应用于自然水体和尿液样品中镧的测定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spectrophotometric Estimation of Lanthanum with Alizarine Red S and Triton X-100 -Applications to Water Samples and Urine
This method involves the development of a highly sensitive spectrophotometric procedure to estimate lanthanum in an aqueous medium. The procedure involved the treatment of lanthanum with Alizarine Red S as chromophor reagent in presence of neutral surfactant (Triton X-100). At pH4.5, a soluble red complex was produced and exhibited absorption peak with maximum absorption at 523nm. The calibration graph was linear and compatible to Beer's law over the range of concentration 0.125 to 10.0 µg.ml -1 with determination coefficient (R 2 =0.9994). The apparent molar absorptivity of the complex La-ARS was found to be 0.7222x10 4 l.mol -1 .cm -1 which corresponds to the sensitivity of Sandell’s index of 1910.0 µg.cm -2 . The stoichiometric of the complex was studied and it is equal to 1:2 (La: ARS). The values of LOD, LOQ and the range of recovery percentage were estimated and found to be 0.04182, 0.04434 µg.ml -1 and 96.1% to 103.5%, respectively. The precision (RSD) was also calculated and found to be in the range 0.469 to 1.612. The proposed procedure has been applied successfully for the determination of lanthanum in natural waters and urine sample.
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