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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >5-CHLOROSALICYLIC ACID SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF TITANIUM AND SIMULTANEOUS DETERMINATION OF TITANIUM(IV) OXIDE AND IRON(III) OXIDE CONTENT OF PORTLAND CEMENT
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5-CHLOROSALICYLIC ACID SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF TITANIUM AND SIMULTANEOUS DETERMINATION OF TITANIUM(IV) OXIDE AND IRON(III) OXIDE CONTENT OF PORTLAND CEMENT

机译：5-氯水杨酸分光光度法同时测定硅酸盐水泥中钛（IV）和氧化铁（III）的含量

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A spectrophotometric study of the titanium(IV)-5-chlorosalicylic acid (CSA) reaction was carried onto ascertain the suitability of the titanium-CSA complex formed at pH 2.5-3 for the direct spectrophotometric determination of titanium, The method is simple and rapid and possesses reasonable selectivity, A linear calibration graph is obtained up to a concentration of 5.8 mu g ml(-1) of titanium, The optimum range for determination (Ringbom) is between 0.53 and 4.8 mu g ml(-1). The molar absorptivity and Sandell's sensitivity are 1.9 x 10(4) l mol(-1) cm(-1) and 1.25 x 10(-3) mu g cm(-2), respectively, at 355 nm, Application of the method to the simultaneous determination of TiO2 and Fe2O3 in Portland cement was investigated, The absorbance at 510 nm, due to the iron(III)-CSA complex, is recommended for the determination of Fe2O3 in cement, whereas the characteristic absorption of the titanium complex at 355 nm is corrected for iron(III) present in the sample, The analysis of cement materials containing different proportions of titanium and iron is feasible over the concentration ranges 1.28-4.8 mu g ml(-1) Ti and 18.5-40.2 mu g ml(-1) Fe3+. The limits of detection (at the 95% confidence level) of the method are 12 and 36 ng ml(-1) for titanium and iron, respectively, The individual determination of titanium in cement samples can also be achieved if iron(III) present in solution is masked by the addition of 0.01 mol l(-1) ascorbic acid. The developed procedure was tested by analysing several samples and was found to give satisfactory results. [References: 30]
机译：进行了分光光度法研究钛（IV）-5-氯水杨酸（CSA）反应，以确定在pH 2.5-3时形成的钛-CSA络合物直接分光光度法测定钛的适用性，该方法简便快速并具有合理的选择性，得到线性校准图，浓度最高为5.8μg ml（-1）钛。最佳测定范围（Ringbom）在0.53至4.8μg ml（-1）之间。在355 nm处的摩尔吸收率和Sandell灵敏度分别为1.9 x 10（4）l mol（-1）cm（-1）和1.25 x 10（-3）μg cm（-2）为了同时测定波特兰水泥中的TiO2和Fe2O3，建议使用铁（III）-CSA络合物在510 nm处的吸光度测定水泥中的Fe2O3，而钛络合物的特征吸收在校正了样品中存在的铁（III）的355 nm。在浓度范围为1.28-4.8μg ml（-1）和18.5-40.2μg ml的范围内分析包含不同比例的钛和铁的水泥材料是可行的（-1）Fe3 +。该方法的检出限（在95％置信水平下）的钛和铁分别为12和36 ng ml（-1）。如果存在铁（III），也可以单独测定水泥样品中的钛通过添加0.01 mol l（-1）抗坏血酸掩盖溶液中的溶液。通过分析几个样品对开发的程序进行了测试，发现结果令人满意。 [参考：30]

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