Simple Modification of Karl-Fischer Titration Method for Determination of Water Content in Colored Samples
Simple Modification of Karl-Fischer Titration Method for Determination of Water Content in Colored Samples
复制标题
卡尔费休滴定法的简单改进用于测定有色样品中的水含量
DOI：
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发表时间：
2012
影响因子：
2.6
通讯作者：
S. Kreft
中科院分区：
文献类型：
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作者：
E. Tavčar;E. Turk;S. Kreft
含水量测定最常用的技术是卡尔-费休滴定和电测检测，需要专门的设备。当没有合适的设备时，可以通过目视检测滴定终点来执行该方法，这无法分析有色样品。在这里，我们开发了一种滴定终点的分光光度检测方法，适用于有色样品的水分测定。反应在密封的4 ml比色皿中进行。在520 nm处进行检测。滴定终点由吸光度相对于滴定体积绘制的图确定。该方法具有良好的重现性（RSD = 4.3%）、准确度和线性（R2 = 0.997）。
The most commonly used technique for water content determination is Karl-Fischer titration with electrometric detection, requiring specialized equipment. When appropriate equipment is not available, the method can be performed through visual detection of a titration endpoint, which does not enable an analysis of colored samples. Here, we developed a method with spectrophotometric detection of a titration endpoint, appropriate for moisture determination of colored samples. The reaction takes place in a sealed 4 ml cuvette. Detection is performed at 520 nm. Titration endpoint is determined from the graph of absorbance plotted against titration volume. The method has appropriate reproducibility (RSD = 4.3%), accuracy, and linearity (R 2 = 0.997).