Genotypic differences in arsenic, mercury, lead and cadmium in milled rice (Oryza sativa L.).

摘要

The contents of As, Hg, Pb and Cd in milled rice were determined. Among 216 genotypes, the As, Hg, Pb and Cd contents were in the ranges 5.06-296.45, 2.46-65.85, 4.16-744.95 and 5.91-553.40 ng/g, respectively. 6 genotypes with lower contents of toxic metal elements were selected. The averages of As and Pb contents for indica rice were higher than those of japonica rice, while the averages of Hg and Cd contents were in contrast. Compared with white brown rice, the milled rice from black and red brown rice contained lower contents of 4 elements. A significant negative correlation was found between As content and alkaline spread value. Significant correlations were observed between As and aspartic acid (Asp) content, Hg and Asp or leucine contents, and Pb and cysteine or methionine contents. Cd content was significantly negatively correlated with protein and 14 amino acid contents.