自动电位滴定仪高效高精度测定海水碱度值

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

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。

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 % （±2 μmol/kg）. About 25 g of seawater was required for one sample and the determination time was about 9 rains.