Application of Automatic Potentiometric Titrator in Continuous Titration of Six Indices in Groundwater

Wen-jie ZHAO; Ming MA; Ke ZHANG; Yan-xiang LI; Ming-lan HOU; Yu-qiang ZHANG

doi:10.15898/j.cnki.11-2131/td.201711060176

Wen-jie ZHAO, Ming MA, Ke ZHANG, Yan-xiang LI, Ming-lan HOU, Yu-qiang ZHANG. Application of Automatic Potentiometric Titrator in Continuous Titration of Six Indices in Groundwater[J]. Rock and Mineral Analysis, 2018, 37(5): 580-585. DOI: 10.15898/j.cnki.11-2131/td.201711060176

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Application of Automatic Potentiometric Titrator in Continuous Titration of Six Indices in Groundwater

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BACKGROUNDThe analysis of six indices (pH, total alkalinity, chloride ion, calcium ion, magnesium ion and sulfate radical) in underground water needed to be sampled separately for each index. The steps were tedious with low efficiency. Furthermore, the total alkalinity, chlorine ion, calcium ion, magnesium ion and sulfate radical usually used manual visual titration, resulting in manual operation error, poor precision, and inaccuracy.OBJECTIVESTo establish an accurate and rapid method for the analysis of six indices in underground water.METHODSThe method established and described in this paper only needed two samples and the Automatic Potentiometric Titrator could determine the end point automatically. The Automatic Potentiometric Titrator could accurately control the addition of standard solution to 0.1 μL, and eliminate mutual interference by adjusting the detection order, acidity and the addition of a masking agent.RESULTSThe recoveries of this method are 93.5%-120.0%, and the relative standard deviations (RSDs, n=10) are 0.18%-11.33%.CONCLUSIONSThe results obtained by potentiometric titration had better parallelism and stability, especially when the measured water samples were more turbid or colored.

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Application of Automatic Potentiometric Titrator in Continuous Titration of Six Indices in Groundwater

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