Department of Food Safety and Veterinary Public Health, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
J Agric Food Chem. 2010 Sep 22;58(18):10176-83. doi: 10.1021/jf102084p.
Seven hundred and twenty-six samples of wheat grains from the majority of Italian agricultural areas were pooled into 141 composite samples, homogeneous with respect to geographical origin and wheat variety. The average arsenic concentration of the pooled samples was 9 ng g(-1), with a range of 2-55 ng g(-1) (dry weight basis). The spread of arsenic concentrations (coefficient of variation of 91%) was related to spatial variability associated with geochemical and environmental factors. Temporal variability was investigated by a 3-year longitudinal study on 7 wheat cultivars grown in 22 areas of central and northern Italy. Average year-to-year variation in arsenic levels was low, and the average of the coefficients of variation was 23%. These results show that mapping of phytoavailable arsenic in agricultural soils can be done by measuring arsenic concentration in representative samples of wheat grains. Arsenic speciation in the grain showed that As(III) and As(V) were the major As compounds, highlighting the importance of wheat as a source of inorganic arsenic in the diet.
从意大利大部分农业区采集了 726 份小麦样品，将它们混合为 141 个混合样品，在地理来源和小麦品种方面具有均一性。混合样品的平均砷浓度为 9ng/g，范围为 2-55ng/g（干重基础）。砷浓度的分布（91%的变异系数）与与地球化学和环境因素相关的空间变异性有关。通过在意大利中部和北部的 22 个地区种植 7 个小麦品种进行为期 3 年的纵向研究，研究了时间变异性。砷水平的年际平均变化较小，变异系数的平均值为 23%。这些结果表明，可以通过测量小麦籽粒中代表性样品的砷浓度来绘制农业土壤中植物可利用砷的分布图。谷物中的砷形态表明，As(III)和 As(V)是主要的砷化合物，突出了小麦作为饮食中无机砷来源的重要性。
