Guidelines for improving organic carbon recovery by the wet oxidation method.
Guidelines for improving organic carbon recovery by the wet oxidation method.
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DOI：
10.1016/j.chemosphere.2007.01.021
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发表时间：
2007-06
期刊：
影响因子：
8.8
通讯作者：
M. Mingorance;E. Barahona;J. Fernández-Gálvez
中科院分区：
文献类型：
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作者：
M. Mingorance;E. Barahona;J. Fernández-Gálvez
对土壤退化过程的研究以及对环境质量的监测往往会产生大量的样本，其中有机碳是需要确定的关键属性。本文介绍了一种快速测定有机碳的湿式氧化法，在3mlK_2Cr_2O_7和6mlH_2SO_4的小瓶中进行反应，用分光光度法测定有机碳氧化产生的Cr ~（3+）。不需要特殊设备，处理量减少到最低限度，每天可以分析100多个样品。在操作方案中有一个重要的细节：在氧化过程中，小瓶被放置在绝缘块内。隔热延迟小瓶的冷却，这导致高有机C回收率（超过0.90）。改进后的方法可行、简单、易操作。方法的重现性小于10%，标准物质的回收率在90%左右。该方法适用于大范围有机碳含量的测定。
The study of soil degradation processes as well as the monitoring of environmental quality often yields large sample batches in which organic carbon is the key property to be determined. A description is given for a rapid method to analyse organic carbon by wet oxidation; the reaction is carried out with 3ml K2Cr2O7and 6ml H2SO4in small vials, and Cr3+resulting from organic C oxidation is determined by spectrophotometry. No special equipment is needed and handling is reduced to a minimum, enabling over 100 samples per day to be analysed. There is one important detail in the operation protocol: the vials are placed inside an insulator block during oxidation. Heat insulation retards the cooling of vials, which results in a high organic C recovery (over 0.90). The improved method is feasible, simple, and easy to perform. Reproducibility was lower than 10% and recoveries from certified reference materials were about 90%. The simplified method is recommended for widespread organic C content sampling.