期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 6, 页码 2472-2480出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b06721
关键词
Municipal sewage sludge; Crop quality; Foliar application; Root uptake; Vegetable
资金
- National Natural Science Foundation of China [41977355, 41430752]
The impacts of land application of sludge contaminated with silver nanoparticles (Ag NPs) on crop yield and nutritional quality are relatively unknown. Chili (Capsicum annuum L.), lettuce (Lactuca sativa), and radish (Raphanus sativus L.) were grown for 52- 71 days in soil amended by sludge with or without Ag NPs. Then root- exposed chili and lettuce continued to grow until day 75 and 105, during which they were simultaneously exposed to Ag-107 NPs via leaves for 3 days. Root exposure reduced the yield of lettuce and radish by 42 and 61%. It had minimal effects on essential element (Ca, K, Mg, P, Fe, Mn, and Zn) contents in chili fruits and radish roots or on protein, amino acid, and most essential element contents in lettuce leaves. Exceptions were K and Mg in lettuce leaves, which decreased by similar to 25%. Further, root uptake dominated over foliar uptake (86 and 95% of total Ag) in Ag accumulation in younger leaves and flowers of lettuce, as revealed by the stable isotope tracer technique, suggesting unintended residual transgenerational effects of land application of sludge contaminated with Ag NPs. These results guide the agricultural application of Ag NPs in a more efficient and safer manner.
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