title: Speciation of organic and inorganic selenium in selenium-enriched rice by graphite furnace atomic absorption spectrometry after cloud point extraction.
abstract: A new method was developed for the determination of organic and inorganic selenium in selenium-enriched rice by graphite furnace atomic absorption spectrometry detection after cloud point extraction. Effective separation of organic and inorganic selenium in selenium-enriched rice was achieved by sequentially extracting with water and cyclohexane. Under the optimised conditions, the limit of detection (LOD) was 0.08 μg L(-1), the relative standard deviation (RSD) was 2.1% (c=10.0 μg L(-1), n=11), and the enrichment factor for selenium was 82. Recoveries of inorganic selenium in the selenium-enriched rice samples were between 90.3% and 106.0%. The proposed method was successfully applied for the determination of organic and inorganic selenium as well as total selenium in selenium-enriched rice.
authors.affiliation: CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China. sunmei@ustc.edu.cn
authors.forename: Mei
authors.initials: M
authors.lastname: Sun
authors.forename: Guijian
authors.initials: G
authors.lastname: Liu
authors.forename: Qianghua
authors.initials: Q
authors.lastname: Wu
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D012275:Oryza / Q000737:chemistry*; D012643:Selenium / Q000032:analysis* / Q000302:isolation & purification*; D013054:Spectrophotometry, Atomic / Q000379:methods*
chemical_list: D012643:Selenium