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Separations 2016, 3(1), 9; doi:10.3390/chromatography3010009

The Simultaneous Determination of Silicic, Boric and Carbonic Acids in Natural Water via Ion-Exclusion Chromatography with a Charged Aerosol Detector

1
Department of Environmental and Symbiotic Science, College of Agriculture, Food and Environmental Sciences, Rakuno Gakuen University, 582 Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
2
Faculty of Industrial Sciences and Technology, University Malaysia Pahang, Lebuhraya Tun Razak 26300 Gambang Kuantan, Pahang Darul Makmur, Malaysia
3
Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan
4
Faculty of Engineering, Chubu University, 1200 Matsumoto-cho, Kasugai, Aich 487-8501, Japan
Current address: Graduate School of Environmental Science, Faculty of Environmental Earth Science, Hokkiado University, N10W5, Sapporo, Hokkaido 060-0810, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Christopher R. Harrison
Received: 14 January 2016 / Revised: 21 February 2016 / Accepted: 26 February 2016 / Published: 8 March 2016
(This article belongs to the Special Issue Ion Chromatography)
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Abstract

The simple and simultaneous determination of silicic, boric and carbonic acids was made using ion-exclusion chromatography (IEC) and a Corona™ charged aerosol detector (C-CAD). Silicic and boric acids were separated by the column packed with a weakly acidic cation-exchange resin in H+-form and ultra-pure water eluent, and the detector responses were improved by the addition of acetonitrile to eluent. Under the optimized conditions, the simultaneous determination of weak inorganic acids, except for carbonic acid, was successfully performed. When the conversion column packed with a strong acidic cation-exchange resin in Na+- or K+-form was inserted between the separation column and the detector, weak inorganic acids including carbonic acid could be detected by the C-CAD. The calibration curves were linear in the range of 0.5–10 mg·L−1 as Si for silicic acid (r2 = 0.996), 10–100 mg·L−1 as B for boric acid (r2 = 0.998) and 1.3–21 mg·L−1 as C for carbonic acid (r2 = 0.993). The detection limits based on three times the standard deviation were 0.03 mg·L−1 as Si for silicic acid, 0.40 mg·L−1 as B for boric acid and 0.08 mg·L−1 as C for carbonic acid. This method was applicable to river, hot spring and drinking water. View Full-Text
Keywords: ion-exclusion chromatography (IEC); Corona™ charged aerosol detector (C-CAD); silicic acid; boric acid; carbonic acid; conversion column ion-exclusion chromatography (IEC); Corona™ charged aerosol detector (C-CAD); silicic acid; boric acid; carbonic acid; conversion column
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Otsuka, Y.; Nakatani, N.; Takahashi, T.; Kozaki, D.; Mori, M.; Tanaka, K. The Simultaneous Determination of Silicic, Boric and Carbonic Acids in Natural Water via Ion-Exclusion Chromatography with a Charged Aerosol Detector. Separations 2016, 3, 9.

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