Centro de Edafología y Biología Aplicada del Segura, CSIC. PO Box 164, 30100 Murcia, Spain.
Environ Sci Technol. 2010 Dec 15;44(24):9463-9. doi: 10.1021/es102012s. Epub 2010 Nov 23.
An agricultural site in Segovia province (Spain) contains high levels of arsenic (As) of geological origin in its groundwater, which is used intensively for irrigation. Crops, irrigation waters, and soils were analyzed to evaluate the occurrence of As in this area and its potential impact on the food chain. High As mobility was found in the agricultural soils, related to the application of As in the irrigation waters (14.8-280 μg As L(-1)) and the general alkaline and sandy character of these soils, which imposes a low capacity for As sorption and therefore enhances plant uptake. The use of amendments can also affect the solubility of As in these soils. Evidence for this was evaluated based on a study of the effect of organic (compost) and inorganic (iron oxides-rich rolling mill scale and phosphate fertilizer) amendments. Arsenic solubility in soil and plant uptake were high, but not significantly affected by organic matter or phosphate addition, while As immobilization was associated with addition of iron oxides with the rolling mill scale, although this did not result in a decrease of As uptake by the tested plants.
西班牙塞戈维亚省的一个农业区，其地下水中含有高水平的地质成因砷（As），这些地下水被大量用于灌溉。分析了作物、灌溉用水和土壤，以评估该地区砷的存在情况及其对食物链的潜在影响。农业土壤中砷的迁移性很高，这与灌溉水中砷的应用（14.8-280μg As L（-1））以及这些土壤的普遍碱性和沙质特征有关，这导致砷的吸附能力较低，从而增强了植物的吸收。改良剂的使用也会影响这些土壤中砷的溶解度。基于对有机（堆肥）和无机（富含氧化铁的轧钢厂规模和磷酸盐肥料）改良剂影响的研究，评估了这方面的证据。土壤和植物吸收中的砷溶解度很高，但受有机物或磷酸盐添加的影响并不显著，而砷的固定与添加轧钢厂规模的氧化铁有关，但这并没有导致测试植物对砷的吸收减少。
