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首页> 美国卫生研究院文献>Analytical Chemistry Insights >A Simple and Selective Spectrophotometric Method for the Determination of Trace Gold in Real Environmental Biological Geological and Soil Samples Using Bis (Salicylaldehyde) Orthophenylenediamine
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A Simple and Selective Spectrophotometric Method for the Determination of Trace Gold in Real Environmental Biological Geological and Soil Samples Using Bis (Salicylaldehyde) Orthophenylenediamine

机译：一种简单选择性的分光光度法使用双（水杨醛）邻苯二胺测定实际环境生物地质和土壤样品中的痕量金

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A simple high sensitive, selective, and rapid spectrophotometric method for the determination of trace gold based on the rapid reaction of gold(III) with bis(salicylaldehyde)orthophenylenediamine (BSOPD) in aqueous and micellar media has been developed. BSOPD reacts with gold(III) in slightly acidic solution to form a 1:1 brownish-yellow complex, which has an maximum absorption peak at 490 nm in both aqueous and micellar media. The most remarkable point of this method is that the molar absorptivities of the gold-BSOPD complex form in the presence of the nonionic TritonX-100 surfactant are almost a 10 times higher than the value observed in the aqueous solution, resulting in an increase in the sensitivity and selectivity of the method. The apparent molar absorptivities were found to be 2.3 × 104 L mol−1 cm−1 and 2.5 × 105 L mol−1 cm−1 in aqueous and micellar media, respectively. The reaction is instantaneous and the maximum absorbance was obtained after 10 min at 490 nm and remains constant for over 24 h at room temperature. The linear calibration graphs were obtained for 0.1–30 mg L−1 and 0.01–30 mg L−1 of gold(III) in aqueous and surfactant media, respectively. The interference from over 50 cations, anions and complexing agents has been studied at 1 mg L−1 of Au(III); most metal ions can be tolerated in considerable amounts in aqueous micellar solutions. The Sandell’s sensitivity, the limit of detection and relative standard deviation (n = 9) were found to be 5 ng cm−2, 1 ng mL−1 and 2%, respectively in aqueous micellar solutions. Its sensitivity and selectivity are remarkably higher than that of other reagents in the literature. The proposed method was successfully used in the determination of gold in several standard reference materials (alloys and steels), environmental water samples (potable and polluted), and biological samples (blood and urine), geological, soil and complex synthetic mixtures. The results obtained agree well with those samples analyzed by atomic absorption spectrophotometry (AAS).
机译：基于金（III）与双（水杨醛）邻苯二胺（BSOPD）在水和胶束介质中的快速反应，开发了一种简单的高灵敏，选择性，快速的分光光度法测定痕量金。 BSOPD与金（III）在微酸性溶液中反应形成1：1棕黄色复合物，在水性和胶束介质中均在490 nm处具有最大吸收峰。该方法最显着的一点是，在非离子型TritonX-100表面活性剂存在下，金-BSOPD配合物形式的摩尔吸收率几乎比水溶液中观察到的值高10倍，从而导致方法的灵敏度和选择性。表观摩尔吸光度为2.3×10 4 L mol -1 cm -1 和2.5×10 5 L mol -1 cm -1 分别在水性介质和胶束介质中。反应是瞬时的，在490 nm下10分钟后获得最大吸光度，并在室温下保持24小时以上不变。在水和表面活性剂介质中分别获得了0.1–30 mg L -1 和0.01–30 mg L -1 的线性校正图。在1 mg L -1 的Au（III）中研究了来自50多种阳离子，阴离子和络合剂的干扰；大多数金属离子在胶束水溶液中都可以耐受。发现Sandell的灵敏度，检出限和相对标准偏差（n = 9）为5 ng cm -2 ，1 ng mL -1 和2％，分别在胶束水溶液中。其灵敏度和选择性显着高于文献中其他试剂。该方法成功地用于测定几种标准参考物质（合金和钢），环境水样品（可饮用和污染的）和生物样品（血液和尿液），地质，土壤和复杂的合成混合物中的金。获得的结果与那些通过原子吸收分光光度法（AAS）分析的样品非常吻合。

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