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

发布时间：2018-01-11 13:22

  本文关键词：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　出处：《岩矿测试》2016年04期 　论文类型：期刊论文

  更多相关文章： 海洋沉积物 有机碳 自动电位滴定仪 滴定终点判定 氧化还原电位

【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 simple operation and rapid determination, and reduces the influence of artificial operation. In this paper, the content of organic carbon in marine sediments is determined by automatic potentiometric titration. It is compared with the national standard GB 17378.5-2007 that the titration end point can be determined by naked eye according to the color change of the solution during titration. The feasibility of realizing accurate determination of titration end point by means of the instrument is determined. The result shows that the detection limit of automatic potentiometric titration is 0.029%. The detection limit of artificial eye was 0.086. There was no significant difference between the two methods in titration endpoint, but the accuracy and precision of automatic potentiometric titrator were better. The titration endpoints can be determined by replacing the naked eye to some extent. In the practical application, it is also found that the potential changes are more complicated when the titration solution system is affected by the redox reaction and complexation. It is possible that the automatic potentiometric titrator can obtain multiple isochronous points and can not determine which isochronous point is the real target isochronous point which needs to be determined with the aid of the naked eye.
【作者单位】： 国家海洋局第一海洋研究所;
【基金】：中央级公益性科研院所基本科研业务费专项资金(2013G11,2011T10) 青岛市创新人才资金(13-CX-20) 山东省泰山学者海外特聘人才项目
【分类号】：P736.4;O657.1
【正文快照】： 目前,全球碳循环的研究已经成为国际地学的主要研究课题。海洋作为地球系统中除岩石圈以外最大碳库,碳储量高达38×1012吨[1]。海洋中有机碳是全球碳循环的重要组成部分,是衡量水体中有机污染程度的一项综合指标[2],对它的研究可以指导维持海洋生产力开发和海洋环境保护的平衡，

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