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王兵, 高丰蕾, 杨佩华, 孙承君, 韩彬. 自动电位滴定仪应用于测定海洋沉积物中有机碳的可行性研究[J]. 岩矿测试, 2016, 35(4): 402-408. DOI: 10.15898/j.cnki.11-2131/td.2016.04.011
引用本文: 王兵, 高丰蕾, 杨佩华, 孙承君, 韩彬. 自动电位滴定仪应用于测定海洋沉积物中有机碳的可行性研究[J]. 岩矿测试, 2016, 35(4): 402-408. DOI: 10.15898/j.cnki.11-2131/td.2016.04.011
Bing WANG, Feng-lei GAO, Pei-hua YANG, Cheng-jun SUN, Bin HAN. Feasibility Study on the Application of Automatic Potentiometric Titrator in the Measurement of Organic Carbon in Marine Sediments[J]. Rock and Mineral Analysis, 2016, 35(4): 402-408. DOI: 10.15898/j.cnki.11-2131/td.2016.04.011
Citation: Bing WANG, Feng-lei GAO, Pei-hua YANG, Cheng-jun SUN, Bin HAN. Feasibility Study on the Application of Automatic Potentiometric Titrator in the Measurement of Organic Carbon in Marine Sediments[J]. Rock and Mineral Analysis, 2016, 35(4): 402-408. DOI: 10.15898/j.cnki.11-2131/td.2016.04.011

自动电位滴定仪应用于测定海洋沉积物中有机碳的可行性研究

Feasibility Study on the Application of Automatic Potentiometric Titrator in the Measurement of Organic Carbon in Marine Sediments

  • 摘要: 自动电位滴定仪具有操作简便、测定速度快的优势,减少了人为操作的影响,本文使用自动电位滴定仪测定海洋沉积物中有机碳的含量,并与国家标准(GB 17378.5-2007)中根据滴定过程中溶液颜色变化用肉眼判定滴定终点的方法进行了对比分析,确定通过仪器自动判断滴定终点实现准确测定的可行性。结果表明:自动电位滴定的方法检出限为0.029%,人工肉眼判定终点的方法检出限为0.086%,在滴定终点判定方面两种方法无显著性差异,但自动电位滴定仪的准确度和精密度更优,在一定程度上可代替肉眼判定滴定终点。实际应用过程中也发现,当滴定的溶液体系由于氧化还原反应、络合作用等影响因素使电位变化较为复杂时,自动电位滴定仪有可能会得到多个等当点而无法判断哪个等当点是真正的目标等当点,此时需要利用肉眼进行辅助确定。

     

    Abstract: The automatic potentiometric titrator has the advantages of being simple to operate and giving fast measurement results, which could reduce artifical influence due to manual operation. In this study, organic carbon content of marine sediments was determined by Automatic Potentiometric Titrator. In order to investigate if the Automatic Potentiometric Titrator could accurately determine the titration end-point, this method was compared with the national standard method (GB 17378.5-2007) in which the titration end-point was visually determined through color change. Results show that the detection limits of the automatic potentiometric titrator and manual methods were 0.029% and 0.086%, respectively. There are no significant differences between the two methods in titration end-point determination. However, the Automatic Potentiometric Titrator has better accuracy and precision than manual operation. Therefore, under certain circumstances, Automatic Potentiometric Titrator can take over the visual method to determine the titration end-point. It is also noteworthy that there are some problems in measuring real samples. For example, the Automatic Potentiometric Titrator might be unable to accurately determine the target titration end-point when there are complex electrical potential changes due to redox reactions and chelating interactions in the reaction system. On this occasion, the titration end-point can be determined visually.

     

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