Monitoring and mitigation of toxic heavy metals and arsenic accumulation in food crops: A case study of an urban community garden
Monitoring and mitigation of toxic heavy metals and arsenic accumulation in food crops: A case study of an urban community garden
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DOI：
10.1002/pld3.198
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发表时间：
2020-01-01
期刊：
影响因子：
3
通讯作者：
Schroeder, Julian, I
中科院分区：
文献类型：
--
作者：
Cooper, Andrew M.;Felix, Didra;Schroeder, Julian, I
城市社区菜园作为生产新鲜水果和蔬菜的一种手段越来越普遍，包括在缺乏健康食品选择的地区。然而，城市土壤可能含有高水平的有毒重金属，包括铅和镉以及准金属砷，这可能导致严重的健康风险。在这项研究中，在圣地亚哥东南部的一个城市社区花园（Ocean View Growing Grounds）种植的水果和蔬菜样品在四年的时间内反复采样，以测量有毒重金属和类金属的潜在污染，并制定解决方案。在果树叶片和果实组织中的金属营养，重金属和类金属的浓度进行了监测在采样期间。几种果树的叶片样本显示出铅的吸收，黑使命无花果测量0.843-1.531毫克/公斤干重和墨西哥石灰测量1.103-1.522毫克/公斤干重在采样期间。在这个社区花园和周边地区直接种植在地下的蔬菜的可食用组织中，瑞士甜菜的砷含量为0.80 + 0.073 mg/kg干重，草莓的铅含量为0.84 +/- 0.404 mg/kg干重。随后介绍了未受污染的土壤，消除了任何可检测到的重金属或类金属污染，在这些作物在监测期间。促进可食用组织的监测和降低风险的建议进行了讨论，包括引进提高床和与当地大学和研究小组的合作。
Urban community gardens have increased in prevalence as a means to generate fresh fruits and vegetables, including in areas lacking access to healthy food options. However, urban soils may have high levels of toxic heavy metals, including lead and cadmium and the metalloid arsenic, which can lead to severe health risks. In this study, fruit and vegetable samples grown at an urban community garden in southeastern San Diego, the Ocean View Growing Grounds, were sampled repeatedly over a four-year time period in order to measure potential contamination of toxic heavy metals and metalloids and to develop solutions for this problem. Metal nutrient, heavy metal, and metalloid concentrations were monitored in the leaf and fruit tissues of fruit trees over the sampling period. Several of the fruit trees showed uptake of lead in the leaf samples, with Black Mission fig measuring 0.843-1.531 mg/kg dry weight and Mexican Lime measuring 1.103-1.522 mg/kg dry weight over the sampling period. Vegetables that were grown directly in the ground at this community garden and surrounding areas showed arsenic, 0.80 + 0.073 mg/kg dry weight for Swiss chard, and lead, 0.84 +/- 0.404 mg/kg dry weight for strawberries, in their edible tissues. The subsequent introduction of raised beds with uncontaminated soil is described, which eliminated any detectable heavy metal or metalloid contamination in these crops during the monitoring period. Recommendations for facilitating the monitoring of edible tissues and for reducing risk are discussed, including introduction of raised beds and collaborations with local universities and research groups.