Abstract：
Urban horticulture poses a sustainable form of food production, fosters community engagement and mitigates the impacts of climate change on cities. Yet, it can also be tied to health challenges related to soil contamination. This work builds on a previous study conducted on eleven urban gardens in the city of Vienna, Austria. Following the findings of elevated Pb levels in some soil and plant samples within that project, the present study investigates the elemental composition of soil and plants from two affected gardens 1 year after compost amendment. Inductively coupled plasma mass spectrometry (ICP-MS) analysis of skin, pulp and seeds of tomato fruits revealed minor variations in elemental composition which are unlikely to have an impact on food safety. In turn, a tendency of contaminant accumulation in root tips and leaves of radishes was found. Washing of lettuce led to a significant reduction in the contents of potentially toxic elements such as Be, Al, V, Ni, Ga and Tl, underscoring the significance of washing garden products before consumption. Furthermore, compost amendments led to promising results, with reduced Zn, Cd and Pb levels in radish bulbs. Pb isotope ratios in soil and spinach leaf samples taken in the previous study were assessed by multi-collector (MC-) ICP-MS to trace Pb uptake from soils into food. A direct linkage between the Pb isotopic signatures in soil and those in spinach leaves was observed, underscoring their effectiveness as tracers of Pb sources in the environment.
摘要：
城市园艺是一种可持续的粮食生产形式，促进社区参与，减轻气候变化对城市的影响。然而，它也可能与土壤污染相关的健康挑战有关。这项工作建立在先前对维也纳市11个城市花园进行的研究的基础上，奥地利。根据该项目中一些土壤和植物样品中铅水平升高的发现，本研究调查了堆肥改良1年后两个受影响花园的土壤和植物的元素组成。电感耦合等离子体质谱(ICP-MS)分析皮肤,番茄果实的果肉和种子显示出元素组成的微小变化，这不太可能对食品安全产生影响。反过来,在萝卜根尖和叶片中发现了污染物积累的趋势。莴苣的洗涤导致Be等潜在有毒元素的含量显着降低，Al,V,Ni,Ga和Tl,强调在消费前洗涤花园产品的重要性。此外，堆肥改良带来了可喜的结果，减少锌，萝卜鳞茎中Cd和Pb的含量。通过多收集器（MC-）ICP-MS评估了先前研究中采集的土壤和菠菜叶样品中的Pb同位素比，以追踪土壤中的Pb吸收到食物中。观察到土壤中的Pb同位素特征与菠菜叶中的Pb同位素特征之间存在直接联系，强调它们作为环境中Pb源示踪剂的有效性。
