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An alternative analytical method for determining arsenic species in rice by using ion chromatography and inductively
Seong Hun Son1, Won Bae Lee1, Donghun Kim2
1Mokpo National University, Department of Chemistry, 61 dorimri, Chungkyemyon, Muangun, Chonnam 58554, Republic of Korea.
Abstract:
Qualitative and quantitative determination of total arsenic content and arsenic species in rice is very important because rice is one of the main sources of human arsenic intake. However, extraction and determination of arsenic species in rice has been very difficult due to severe matrix interference. An alternative analytical method was developed in this study to determine arsenic species in rice by using ion chromatography coupled to inductively coupled plasma-mass spectrometry. Two internal standards were used. The first internal standard was injected before sample introduction to correct signal change with time. The second internal standard was spiked into the sample to reduce matrix interference. Using the developed method, recoveries of dimethylarsinic acid, monomethylarsonic acid, and inorganic arsenic compared to certified values (NIST SRM 1568b rice flour) were 116%, 107%, and 92%, respectively.
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