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A Review on Alkalinity Analysis Methods Suitable for Korean Groundwater
우리나라 지하수에 적합한 알칼리도 분석법에 대한 고찰
Econ. Environ. Geol. 2018 Dec;51(6):509-20
Published online December 31, 2018;  https://doi.org/10.9719/EEG.2018.51.6.509
Copyright © 2018 the Korean society of economic and environmental gelology.

Kangjoo Kim1*, Se-Yeong Hamm2, Rak-Hyeon Kim3 and Hyunkoo Kim4
김강주1* ·함세영2 ·김락현3 ·김현구4

1Department of Environmental Engineering, Kunsan National University, Kunsan 54150, Korea 2Division of Earth Environmental System, Pusan National University 3Department of Soil and Groundwater, Korea Environment Corporation 4Soil and Groundwater Division, National Institute of Environmental Research, Environmental Research Complex, Incheon, Korea
1군산대학교 환경공학과, 2부산대학교 지구환경시스템학부, 3한국환경공단 토양지하수처, 4국립환경과학원 토양지하수연구과
Received November 5, 2018; Accepted December 11, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Alkalinity is one of the basic variables, which determine geochemical characteristics of natural waters and participate in processes changing concentrations of various contaminants either directly or indirectly. However, not a few laboratories and researchers of Korea still use alkalinity-measurement methods not appropriate for groundwaters, and which becomes one of the major reasons for the poor ion balance errors of the geochemical analysis. This study was performed to review alkalinity-measurement methods, to discuss their advantages and disadvantages, and, thus, to help researchers and analytical specialists in analyzing alkalinity of groundwaters. The pH-titration-curve-inflection-point (PTC-IP) methods, which finds the alkalinity end point from the inflection point of the pH titration curve are revealed to be most accurate. Gran titration technique among them are likely to be most appropriate for accurate estimation of titrant volume to the end point. In contrast, other titration methods such as pH indicator method and pre-selected pH method, which are still commonly being used, are likely to cause erroneous results especially for groundwaters of low ionic strength and alkalinity.
Keywords : Gran titration, pH titration curve, inflection point, pH indicator, partial pressure of carbon dioxide

 

December 2018, 51 (6)