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自动电位滴定仪高效高精度测定海水碱度值
陶小晚^1,2, 钟少军¹, 阎军¹, 瞿成利^1,2
1.中国科学院海洋研究所海洋地质与环境重点实验室;2.中国科学院研究生院

摘要:

为研究海洋碳循环和海洋碳酸盐系统,需要测定样品的碳酸盐碱度。利用电位滴定仪(万通~(?)798MPT Titrino)配合软件tiamol.1检测了海水总碱度。根据碳酸盐解离常数计算出了海水碳酸盐碱度,相时标准偏差低于0.1%(±2μmol/kg),单个样品用量约25 mL,检测时间约9 min。实验结果表明,用自动电位滴定仪测定海水总碱度速度快,精度高,方法可行。

关键词: 总碱度自动电位滴定最大等当点

DOI：

分类号:

基金项目:国家自然科学基金资助项目(40376038)

High efficient and precise determination of total alkalinity of seawater using an automatic potentiometric titrator

Abstract:

In the study of global ocean carbon cycle and marine carbonate system, it’s essential to determine the total alkalinity of seawater samples. Using an automatic potentiometric titrator (Metrohm~(?) 798MPT Titrino), we analyzed the total alkalinity of seawater samples. The analytical precision was better than 0.1% (±2μmol/kg). About 25 g of seawater was required for one sample and the determination time was about 9 mins.

Key words: total alkalinity automatic potentiometric titration equivalent point maximum

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