State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Jiangsu, 210023, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Jiangsu, 210023, China; School of Environment, Nanjing Normal University, Nanjing, 210023, China.
Chemosphere. 2020 May;247:125916. doi: 10.1016/j.chemosphere.2020.125916. Epub 2020 Jan 17.
Arsenic (As) and cadmium (Cd) are ubiquitous in the environment and they are both toxic to humans. When present in soils, they can enter food chain, thereby threatening human health. Water spinach (Ipomoea aquatica) is an important leafy vegetable, which is widely consumed in Asian countries. However, it is efficient in taking up As and Cd from soils and accumulating them in the edible parts. Therefore, it is of significance to reduce its As and Cd content, especially in contaminated soil. In this study, pot experiments were conducted to investigate the ability of As-hyperaccumulator Pteris vittata in reducing As and Cd uptake by water spinach under different phosphorus treatments. P. vittata was grown for 60 d in a contaminated-soil amended with P fertilizer (+P) or phosphate rock (+PR), followed by water spinach cultivation for another 30 d. Plant biomass, As and Cd contents in plants and soils, and soil pH were analyzed. We found that, P. vittata coupled with PR decreased the As concentration in water spinach shoots by 42%, probably due to As uptake by P. vittata. Moreover, P. vittata decreased the Cd accumulation in water spinach by 24-44%, probably due to pH increase of 0.47-0.61 after P. vittata cultivation. Taking together, the results showed that P. vittata coupled with PR decreased the As and Cd content in water spinach, which is of significance for improving food safety and protecting human health.
砷（As）和镉（Cd）在环境中普遍存在，对人类都有毒性。当它们存在于土壤中时，可能会进入食物链，从而威胁人类健康。蕹菜（Ipomoea aquatica）是一种重要的绿叶蔬菜，在亚洲国家广泛食用。然而，它从土壤中吸收 As 和 Cd 的效率很高，并将其积累在可食用部分。因此，减少其 As 和 Cd 含量，尤其是在污染土壤中，具有重要意义。本研究通过盆栽实验，研究了砷超富集植物蜈蚣草在不同磷处理下对蕹菜吸收 As 和 Cd 的能力的影响。在添加磷肥（+P）或磷矿（+PR）的污染土壤中，蜈蚣草培养 60d 后，再种植蕹菜 30d。分析了植物生物量、植物和土壤中 As 和 Cd 含量以及土壤 pH 值。结果表明，PR 与蜈蚣草耦合降低了蕹菜地上部的 As 浓度 42%，可能是由于蜈蚣草对 As 的吸收。此外，蜈蚣草降低了蕹菜中 Cd 的积累 24-44%，可能是由于蜈蚣草培养后土壤 pH 值增加了 0.47-0.61。综上所述，结果表明 PR 与蜈蚣草耦合降低了蕹菜中的 As 和 Cd 含量，这对于提高食品安全和保护人类健康具有重要意义。
