Dissolution and Aggregation of Metal Oxide Nanoparticles in Root Exudates and Soil Leachate: Implications for Nanoagrochemical Application
Dissolution and Aggregation of Metal Oxide Nanoparticles in Root Exudates and Soil Leachate: Implications for Nanoagrochemical Application
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DOI：
10.1021/acs.est.1c00767
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发表时间：
2021-05-24
影响因子：
11.4
通讯作者：
Keller, Arturo A.
中科院分区：
文献类型：
--
作者：
Cervantes-Aviles, Pabel;Huang, Xiangning;Keller, Arturo A.
了解纳米农药在根分泌物（RE）和土壤渗滤液中的溶解、聚集和稳定性将有助于改善递送机制、在植物中的运输和生物利用度。研究了纳米CeO 2、纳米Mn 3 O 4、纳米Cu（OH）2和纳米MoO 3四种纳米粒子在大豆稀土和土壤渗滤液中的聚集、稳定性和溶解性。聚集体在不同介质中差异很大。在RE中，纳米Cu（OH）（2）和纳米MoO 3在5天内增加了它们的聚集体尺寸;它们的平均尺寸分别从518 +/- 43 nm增加到938 +/- 32 nm和从372 +/- 14 nm增加到690 +/- 65 nm。相反，纳米CeO 2和纳米Mn 3 O 4在RE中随时间解聚，分别从289 +/- 5 nm减小到129 +/- 10 nm和从761 +/- 58 nm减小到143 +/- 18 nm。稀土和土壤渗滤液中的有机酸能吸附在颗粒表面，影响颗粒团聚。由于稀土和土壤渗滤液中存在有机质，四种纳米粒子与稀土和土壤渗滤液接触时均带负电荷。6天后在RE中的溶出度分别为38%、1.2%、0.5%和0.5%。
Knowledge of dissolution, aggregation, and stability of nanoagrochemicals in root exudates (RE) and soil leachate will contribute to improving delivery mechanisms, transport in plants, and bioavailability. We characterized aggregation, stability, and dissolution of four nanoparticles (NPs) in soybean RE and soil leachate: nano-CeO2, nano-Mn3O4, nano-Cu(OH)(2), and nano-MoO3. Aggregation differed considerably in different media. In RE, nano-Cu(OH)(2), and nano-MoO3 increased their aggregate size for 5 days; their mean sizes increased from 518 +/- 43 nm to 938 +/- 32 nm, and from 372 +/- 14 nm to 690 +/- 65 nm, respectively. Conversely, nano-CeO2 and nano-Mn3O4 disaggregated in RE with time, decreasing from 289 +/- 5 nm to 129 +/- 10 nm, and from 761 +/- 58 nm to 143 +/- 18 nm, respectively. Organic acids in RE and soil leachate can be adsorbed onto particle surfaces, influencing aggregation. Charge of the four NPs was negative in contact with RE and soil leachate, due to organic matter present in RE and soil leachate. Dissolution in RE after 6 days was 38%, 1.2%, 0.5%, and