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KMID : 0380620170490060591
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Korean Journal of Food Science and Technology
2017 Volume.49 No. 6 p.591 ~ p.598
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Evaluation of measurement uncertainty for quantitative determination of chlorite and chlorate in fresh-cut vegetables using ion chromatography
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Jung Sung-Jin
Kim Da-Som
Lee Gun-Young
Yun Sang-Soon
Lim Ho-Soo
Jung Young-Rim
Kim He-Kap
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Abstract
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This study aimed to evaluate the measurement uncertainty for the quantitative determination of chlorite and chlorate in ready-to-eat fresh-cut vegetables using ion chromatography with a hydroxide-selective column. One gram of the homogenized sample in deionized water was sonicated and centrifuged at 8,500 rpm. The supernatant was purified by passing it through a Sep-Pak tC18 cartridge, followed by chromatographic determination using a Dionex IonPac AS27 column. The linearity of the calibration curves, recovery, repeatability, and reproducibility of the method were satisfactory. The method detection limit was estimated to be approximately 0.5 mg/kg. Each uncertainty component was evaluated separately, and the combined and expanded uncertainty values were calculated at the 95% confidence level. The measured concentrations for 3 mg/kg of chlorite and chlorate standard materials were 3.18±0.32 and 3.10±0.42 mg/kg, respectively. These results confirmed the reliability of the developed method for measuring the two chlorine-based oxyanions in fresh-cut vegetables.
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KEYWORD
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chlorite, chlorate, fresh-cut vegetable, ion chromatography, measurement uncertainty
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