Combined pollution of copper nanoparticles and atrazine in soil: Effects on dissipation of the pesticide and on microbiological community profiles
•Combined pollution with copper nanoparticles and atrazine in soil is studied.•Isotherms demonstrate that atrazine adsorption is favored by the presence of copper nanoparticles.•Copper nanoparticles decrease atrazine dissipation.•Combined pollution not alter the soil microbial communities. Copper na...
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Published in | Journal of hazardous materials Vol. 361; pp. 228 - 236 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Netherlands
Elsevier B.V
05.01.2019
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Subjects | |
Online Access | Get full text |
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Summary: | •Combined pollution with copper nanoparticles and atrazine in soil is studied.•Isotherms demonstrate that atrazine adsorption is favored by the presence of copper nanoparticles.•Copper nanoparticles decrease atrazine dissipation.•Combined pollution not alter the soil microbial communities.
Copper nanoparticles (NCu) have been proposed as an antimicrobial agent in agriculture. Therefore, NCu may interact with numerous pollutants including pesticides. Little is known about the combined effects of NCu and pesticides in soil. This study aimed at assessing the impact of NCu combined with the herbicide atrazine (ATZ) on soil. We focused on assessing the adsorption and dissipation of ATZ in the presence of NCu and the changes in microbial community profiles. First, ATZ adsorption isotherms (described using the Freundlich equation) were evaluated. After that, soil samples were spiked with NCu (40–60 nm) at 0.05 and 0.15% w/w and ATZ (3 mg a.i kg−1) and incubated for 30 days. The results showed that ATZ adsorption is favored by the presence of NCu. On the other hand, NCu at 0.15% w/w caused a significant decrease in ATZ dissipation, increasing its half-life from 6 to 37 days. Microbial community profiles (bacteria, fungi and nitrifying bacteria) remained relatively stable throughout the evaluated period. Therefore, our findings suggest that NCu can increase the persistence of ATZ in soil, which may be mostly associated to physical-chemical interaction with soil particles more than a microbial impact. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2018.08.042 |