Modification of Analytical Procedure for Determining Total Organic Carbon in Lake Waters Using a TOC Analyzer

K. Hayakawa, Y. Hirose, T. Okamoto, Syo-ichi Hichiri, T. Ohara, Kiyuki Noto, Shinsuke Inoue
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引用次数: 1

Abstract

Total organic carbon (TOC) is one of the indicators of organic pollution in aquatic environments. In this study, the pretreatment and measurement procedures employed when using a TOC analyzer with combustion catalytic oxidation are investigated to improve the accuracy of the analysis for samples containing suspended particles. Our results show that ultrasonically disrupting the particles promotes the homogenization of the suspension, which improves the accuracy of the TOC measurement. The TOC analyzer, which was designed to reduce the loss of samples in the injection syringe and the pathway of the equipment, obtained good recovery rates for samples taken from the north basin of Lake Biwa. However, low recovery rates were obtained for samples with high concentrations of suspended solids or dissolved organic matter. The low recovery rates reduced the accuracy of particulate organic carbon (POC) concentrations calculated as the difference between TOC and dissolved organic carbon (DOC) concentrations. It was found that the accuracy can be improved by using different methods (NPOC and TC-IC methods) for TOC combustion oxidation, depending on the sample concentration.
TOC分析仪测定湖泊水体总有机碳分析方法的改进
总有机碳(TOC)是水体环境有机污染的指标之一。在本研究中,研究了使用燃烧催化氧化TOC分析仪时采用的预处理和测量程序,以提高对含有悬浮颗粒的样品的分析准确性。结果表明,超声干扰颗粒可促进悬浮液的均匀化,从而提高TOC测量的准确性。该TOC分析仪旨在减少注射注射器中样品的损失和设备的路径,对琵琶湖北部盆地的样品获得了良好的回收率。但是,对于含有高浓度悬浮物或溶解有机物的样品,回收率较低。低回收率降低了颗粒有机碳(POC)浓度作为TOC与溶解有机碳(DOC)浓度之差计算的准确性。结果表明,根据样品浓度的不同,采用不同的方法(NPOC法和TC-IC法)测定TOC燃烧氧化的准确度可以得到提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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