Reference materials for oceanic CO2 analysis:: a method for the certification of total alkalinity

被引:415
作者
Dickson, AG [1 ]
Afghan, JD [1 ]
Anderson, GC [1 ]
机构
[1] Univ Calif San Diego, Scripps Inst Oceanog, Marine Phys Lab, La Jolla, CA 92093 USA
基金
美国国家科学基金会;
关键词
chemical analysis; analytical techniques; alkalinity; titration;
D O I
10.1016/S0304-4203(02)00133-0
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This paper describes a method used to certify reference materials based on seawater for total alkalinity. The technique employs a two-stage, potentiometric, open-cell titration using coulometrically analyzed hydrochloric acid. The equivalence point is evaluated from titration points in the pH region 3.0-3.5 using a least-squares procedure that corrects for the reactions with sulfate and fluoride ions. The reproducibility (one standard deviation) of this technique is less than 1 mumol kg(-1); the accuracy is within 2 mumol kg(-1). (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:185 / 197
页数:13
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