title: Comparison of the concentrations of metal elements and isotopes of lead found in rice and rice bran.
abstract: Very few studies have investigated the difference in the distribution of metal elements between rice and rice bran samples. In this study, the concentrations of 27 metal elements (Li, Be, Na, Mg, Al, K, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, Ag, Cd, Cs, Ba, Tl, Pb, and U) in 56 polished rice and their corresponding bran samples were determined. A significant difference in concentrations of all elements except Ag and Cd was found between rice and bran (P < 0.05), with bran/rice ratios of 1.21 to 36.3. High concentrations of metal elements, especially that of the heavy metal Cr, in bran samples present a potential safety issue for bran products, such as food and feed containing bran. Pb isotope ((204)Pb, (206)Pb, (207)Pb, and (208)Pb) ratios also were determined. The (206)Pb/(207)Pb and (208)Pb/(207)Pb ratios in bran were generally higher than those in rice (P < 0.0001), and rice and bran samples were distinctly different from each other, indicating that Pb isotope composition is an effective for discriminating between bran and rice samples.
authors.affiliation: Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, People's Republic of China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Shouhui
authors.initials: S
authors.lastname: Dai
authors.affiliation: Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, People's Republic of China. yanghui8890@163.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Yang
authors.affiliation: Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, People's Republic of China.
authors.forename: Lan
authors.initials: L
authors.lastname: Yang
authors.affiliation: Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, People's Republic of China.
authors.forename: Fuhua
authors.initials: F
authors.lastname: Wang
authors.affiliation: Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, People's Republic of China.
authors.forename: Ruiying
authors.initials: R
authors.lastname: Du
authors.affiliation: Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, People's Republic of China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, People's Republic of China.
authors.forename: Dian
authors.initials: D
authors.lastname: Wen
mesh_terms: D005506:Food Contamination / Q000032:analysis*; D007554:Isotopes / Q000032:analysis*; D008670:Metals / Q000032:analysis*; D012275:Oryza / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*
chemical_list: D007554:Isotopes; D008670:Metals