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Determination of sulphite in wines using suppressed ion chromatography
Kenji Yoshikawa1, Yuki Uekusa1, Akio Sakuragawa1
1Department of Materials and Applied Chemistry, College of Science and Technology, Nihon University, 1-5-1, Kanda-Surugadai, Chiyoda, Tokyo 101-8308, Japan.
Abstract:
Suppressed ion chromatography with the use of a conductivity detector was developed for the determination of sulphite ions in wine samples. When a mixed solution of sodium carbonate, sodium bicarbonate, and acetone was used as the mobile phase, simultaneous determination of eight inorganic anions (i.e., fluoride, chloride, nitrite, nitrate, sulphite, phosphate, sulphate, and thiosulphate) was completed in approximately 25 min. Linearity, reproducibility, and detection limits were determined for the proposed method. In the case of sulphite detection, a linear calibration curve with a good correlation coefficient of 0.9992 was obtained from the peak height of sulphite with a relative standard deviation (n = 6) 1.48%. In addition, the detection limit of sulphite was 0.27 mg/L at a signal-to-noise ratio of 3. Further, the developed method was applied for the determination of sulphite contained in several wine samples.
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