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Investigations into titanium dioxide nanoparticle and pesticide interactions in aqueous environments
Environmental Science: Nano ( IF 7.3 ) Pub Date : 2017-08-30 00:00:00 , DOI: 10.1039/c7en00445a
Svetlana M. Ilina 1, 2 , Patrick Ollivier 1, 2 , Danielle Slomberg 3, 4, 5, 6, 7 , Nicole Baran 1, 2 , Anne Pariat 3, 4, 5, 6, 7 , Nicolas Devau 1, 2 , Nicole Sani-Kast 8, 9, 10 , Martin Scheringer 8, 9, 10, 11, 12 , Jérôme Labille 3, 4, 5, 6, 7
Affiliation  

The influence of three pesticides (glyphosate, aminomethylphosphonic acid (AMPA) and 2,4-dichlorophenoxyacetic acid (2,4-D)) on the colloidal fate of TiO2 nanoparticles (NPs; anatase and rutile) has been investigated in aqueous conditions of variable chemical composition (Na+ or Ca2+), ionic strength (IS, 10-4–10-1 M), and pH (5 or 8). Sorption and degradation of these pesticides in the presence of the NPs was evaluated. In absence of pesticide, increasing IS, the presence of the divalent cation Ca2+, and a pH close to the NP isoelectric point, favored NP homoaggregation as expected. However, at low IS (≤10-2 M in NaCl; ≤10-3 M in CaCl2), in the presence of a few µg/L of glyphosate and rutile in the mg/L range, NP homoaggregation was prevented, despite a pH=5 close to the NP isoelectric point (4.0–4.2). The phosphonate group of the pesticide drove glyphosate adsorption onto the NP, while the carboxylic group was responsible for electrostatic stabilization of the NP. The stabilizing effect of glyphosate on NP aggregation however appears temporary. Furthermore, TiO2 NPs also adsorbed AMPA and promoted degradation of glyphosate to AMPA. These results highlight new evidence of NP-pesticide interactions and the differences in their fate and potential co-migration behavior in aquatic environments.

中文翻译:

在水环境中研究二氧化钛纳米粒子与农药的相互作用

在可变的水性条件下,研究了三种农药(草甘膦,氨基甲基膦酸(AMPA)和2,4-二氯苯氧基乙酸(2,4-D))对TiO2纳米颗粒(NP;锐钛矿和金红石)的胶体命运的影响。化学成分(Na +或Ca2 +),离子强度(IS,10-4–10-1 M)和pH(5或8)。评估了这些农药在NP存在下的吸附和降解。在没有农药的情况下,IS的增加,二价阳离子Ca2 +的存在以及接近NP等电点的pH值,都有助于NP均聚。但是,在低IS(NaCl中≤10-2M; CaCl2中≤10-3M)下,在存在几微克/升草甘膦和金红石的毫克/升范围内,尽管存在pH = 5接近NP等电点(4.0–4.2)。农药的膦酸酯基使草甘膦吸附到NP上,而羧基则负责NP的静电稳定。草甘膦对NP聚集的稳定作用似乎是暂时的。此外,TiO2 NPs也吸附了AMPA,并促进了草甘膦降解为AMPA。这些结果突出了NP-农药相互作用的新证据以及它们在水生环境中的命运和潜在共迁移行为的差异。
更新日期:2017-08-31
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