Bioaccessibility of metals and human health risk assessment in community urban gardens
Bioaccessibility of metals and human health risk assessment in community urban gardens
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DOI：
10.1016/j.chemosphere.2015.04.079
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发表时间：
2015-09-01
期刊：
影响因子：
8.8
通讯作者：
Mingot, J.
中科院分区：
文献类型：
--
作者：
Izquierdo, M.;De Miguel, E.;Mingot, J.
对从马德里市（西班牙）六个不同特征的社区城市花园收集的总共 48 个样品中的 Ca、Co、Cr、Cu、Fe、Mn、Ni、Pb 和 Zn 的假总浓度（即王水可提取物）和胃生物可利用浓度（即甘氨酸 + HCl 可提取物）进行了测定。碳酸钙似乎是决定大多数这些元素的生物可及性的土壤特性，而有机质、pH 值和质地缺乏影响可以用它们在样品中的低水平（有机质）或其变化范围窄（pH 值和质地）来解释。在两种情况下（即成年城市农民和在城市花园玩耍的儿童）对生物可接近浓度进行的保守风险评估显示，风险水平是可接受的，但城市花园之间存在很大差异，具体取决于其土地使用历史以及与市中心繁忙地区的距离。只有在最坏的情况下，即使用城市花园作为休闲场所的儿童也吃其中种植的农产品时，风险才会超出可接受的限度。 (C) 2015 Elsevier Ltd. 保留所有权利。
Pseudo-total (i.e. aqua regia extractable) and gastric-bioaccessible (i.e. glycine + HCI extractable) concentrations of Ca, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were determined in a total of 48 samples collected from six community urban gardens of different characteristics in the city of Madrid (Spain). Calcium carbonate appears to be the soil property that determines the bioaccessibility of a majority of those elements, and the lack of influence of organic matter, pH and texture can be explained by their low levels in the samples (organic matter) or their narrow range of variation (pH and texture). A conservative risk assessment with bioaccessible concentrations in two scenarios, i.e. adult urban farmers and children playing in urban gardens, revealed acceptable levels of risk, but with large differences between urban gardens depending on their history of land use and their proximity to busy areas in the city center. Only in a worst-case scenario in which children who use urban gardens as recreational areas also eat the produce grown in them would the risk exceed the limits of acceptability. (C) 2015 Elsevier Ltd. All rights reserved.