An automated procedure for laboratory and shipboard spectrophotometric measurements of seawater alkalinity: Continuously monitored single-step acid additions
An automated procedure for laboratory and shipboard spectrophotometric measurements of seawater alkalinity: Continuously monitored single-step acid additions
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用于实验室和船上分光光度测量海水碱度的自动化程序：连续监测单步酸添加
DOI：
10.1016/j.marchem.2015.06.008
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发表时间：
2012
期刊：
影响因子：
3
通讯作者：
J. Mathis
中科院分区：
文献类型：
--
作者：
Xuewu Liu;R. Byrne;Michael Lindemuth;R. Easley;J. Mathis
基于Yao和Byrne（1998）的分光光度法，开发了一个自动分析系统，用于实验室和船上以每小时6个样品的速度测量总碱度。该系统是基于单点盐酸（HCl）滴定的海水样品的已知体积与溴甲酚紫作为指示剂。使用可见光谱法连续监测滴定，以根据样品的实时pH值指导滴定速率。每次滴定在略低于等当点时终止，以达到接近1 μmol kg− 1的精密度和准确度。
Building on the spectrophotometric procedure of Yao and Byrne (1998), an automated analysis system has been developed for laboratory and shipboard measurements of total alkalinity at a rate of 6 samples per hour. The system is based on single-point hydrochloric acid (HCl) titrations of seawater samples of a known volume with bromocresol purple as an indicator. The titration is continuously monitored using visible spectroscopy to guide the titration rate according to the real-time pH of the samples. Each titration is terminated just below the equivalence point to achieve a precision and accuracy near 1 μmol kg− 1.