Soil arsenic availability and the transfer of soil arsenic to crops in suburban areas in Fujian Province, southeast China
Soil arsenic availability and the transfer of soil arsenic to crops in suburban areas in Fujian Province, southeast China
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DOI：
10.1016/j.scitotenv.2006.03.013
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发表时间：
2006-09-15
影响因子：
9.8
通讯作者：
Wang, Guo
中科院分区：
文献类型：
--
作者：
Huang, Rui-Qing;Gao, Shu-Fang;Wang, Guo
对福建省一些主要城市郊区的稻田和菜地土壤中砷的生物有效性、土壤 - 植物转移以及相关健康风险进行了研究。土壤中砷的总浓度范围为1.29 - 25.28毫克/千克，平均值为6.09毫克/千克。有效（磷酸二氢钠可提取）砷含量占土壤总砷的0.7 - 38.2%，且与土壤总砷含量显著相关。对于菜地土壤，砷的有效部分（有效砷与总砷的比率）随着粉粒（粒径0.02 - 0.002毫米）和游离铁（DCB可提取）含量的降低以及土壤pH值和有机质含量的增加而降低。稻田土壤中砷的有效部分随着游离铁和有机质含量的增加以及土壤pH值和粉粒含量的降低而增加。磷酸二氢钠可提取砷与蔬菜中砷浓度的相关性比总砷要好得多。选择基于土壤有效砷的转移因子（TFavail）来比较各种作物的积累能力。稻谷（以风干重为基础）的TFavail值在0.068 - 0.44之间，高于蔬菜的0.001 - 0.12。作物的积累能力按水稻>萝卜>空心菜>芹菜>洋葱>芋头>芥菜>韭菜>小白菜>大白菜>生菜>大蒜>豇豆>花椰菜>葫芦>丝瓜>茄子的顺序降低。根据世界卫生组织推荐的成人砷的暂定可耐受摄入量，每天食用大米和其他富含砷的蔬菜可能导致砷摄入过量。（c）2006爱思唯尔B.V. 版权所有。
The bioavailability, soil-to-plant transfer and associated health risks of arsenic in soils collected from paddy rice fields and vegetable fields in suburban areas of some major cities of Fujian Province were investigated. The total soil concentrations of arsenic ranged from 1.29 to 25.28 mg kg(-1) with a mean of 6.09 mg kg(-1). Available (NaH2PO4-extractable) arsenic content accounted for 0.7-38.2% of total soil arsenic and was significantly correlated with total soil arsenic content. For the vegetable soils, the available fraction (ratio of available As to total As) of arsenic decreased with decreasing silt (particle size 0.02-0.002mm) and free iron (DCB extractable) contents and with increasing soil pH and organic matter content. The available fraction of arsenic in the paddy rice soils increased with increasing free iron and organic matter contents and decreasing soil pH and silt content. The correlation of NaH2PO4-extractable arsenic with the arsenic concentration of the vegetables was much better than that of total As. The transfer factor based on the soil available arsenic (TFavail) was chosen to compare the accumulation ability of the various crops. The TFavail values of rice gains (air-dried weight basis) ranged between 0.068 and 0.44 and were higher than those of the vegetables, ranging from 0.001 to 0.12. The accumulation ability of the crops decreased in the order of rice > radish > water spinach > celery > onion > taro > leaf mustard > fragrant-flowered garlic > pakchoi > Chinese cabbage > lettuce > garlic > cowpea > cauliflower > bottle gourd > towel gourd > eggplant. Daily consumption of rice and other As-rich vegetables could result in an excessive intake of arsenic, based on the provisional tolerable intake for adults for arsenic recommended by WHO. (c) 2006 Elsevier B.V. All rights reserved.