A Spectrophotometric System for High Precision Measurement of pH of Seawater

被引：0
|
作者：
Cao Lu [1 ]
Wang Xiao-Hong [1 ]
Zhang Yun-Yan [1 ]
Wang Zhao-Yu [1 ]
Chu Dong-Zhi [1 ]
Ma Ran [1 ]
机构：
[1] Shandong Acad Sci, Inst Oceanog Instrumentat, Shandong Prov Key Lab Ocean Environm Monitoring T, Qingdao 266001, Peoples R China
来源：
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY | 2017年 / 45卷 / 03期
关键词：
Spectrophotometry; Seawater; pH value; Flow injection analysis; m-Cresol purple; META-CRESOL PURPLE; OCEAN-ACIDIFICATION; IN-SITU; SENSOR; IMPACTS;
D O I：
10.11895/j.issn.0253.3820.160758
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Spectrophotometric seawater pH measurement system is an urgent need of device due to its quick speed and high precision. Based on spectrophotometric method and flow injection analysis technique, an automated system for pH measurement of seawater was developed by integrating pump and valve flow path, LED light source, flow cell and spectrophotometer. This measurement system effectively avoided bubbles. The indicator of concentration gradient in the seawater sample was used to correct for the pH perturbation caused by the indicator, thus the operation of system was simple and convenient. With this system, only 1. 5 min was needed for a sample measurement with a precision of 0. 0013 pH units and an offset of 0. 0059 pH units. This system could be used for the rapid determination of pH of seawater collected by laboratory or research ship with high precision pH values.
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收藏
页码：331 / 335
页数：5
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