Fate of copper in soil: effect of agrochemical (nano)formulations and soil properties

Kah, Mélanie; Navarro, Divina A.; Schenkeveld, Walter D. C.; Kookana, Rai S.; Kirby, Jason K.; Santra, Swadeshmukul; Özcan, Ali

doi:10.1039/d1en00213a

Cited by 2 publications

(2 citation statements)

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“…Then 2 mL of stock solution was mixed with 8 mL of soil solution, wherein the final concentration of copper was 48 mg/L. It should be noted that the concentration of copper used at 48 mg/L was proposed through calculation based on actual application of Cu(OH) 2 nanopesticide at up to 11.8 kg ha −1 , wherein a depth penetration of 1 cm soil results in concentrations of copper about 50 mg/kg [ 16 ]. The aggregation of NPF, AI or NR was investigated through dynamic light scattering (DLS), wherein a Nano ZS-90 zetasizer (Malvern, UK) was used to record data every 2 min for 1.5 h. The sedimentation of NPF, AI or NR was monitored through UV-vis spectrophotometer (UV-2700, Shimadzu, Japan) every 2 min for 1.5 h. The absorbance intensity gradually decreased with an increase in incubation time, which is attributed to sedimentation of NPF, AI or NR.…”

Section: Methodsmentioning

confidence: 99%

Aggregation, Sedimentation and Dissolution of Cu(OH)2-Nanorods-Based Nanopesticide in Soil Solutions

Tang

Hong

et al. 2022

Nanomaterials

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Along with the development of nanotechnology, nanomaterials have been gradually applied to agriculture in recent years, such as Cu(OH)2-nanorods-based nanopesticide, an antibacterial agrochemical with a high efficacy. Nevertheless, knowledge about physical stability of Cu(OH)2 nanopesticide in soil solutions is currently scarce, restricting comprehensive understanding of the fate and risk of Cu(OH)2 nanopesticide in the soil environment. Herein we investigated aggregation, sedimentation and dissolution of Cu(OH)2 nanopesticide in soil solutions extracted from three different soil samples, wherein commercial Cu(OH)2 nanopesticide formulation (NPF), as well as its active ingredient (AI) and laboratory-prepared Cu(OH)2 nanorods (NR) with similar morphology as AI, were used as model Cu(OH)2 nanopesticides. We found that NPF compared to AI showed less extents of aggregation in ultrapure water due to the presence of dispersing agent in NPF. Yet, moderated aggregation and sedimentation were observed for Cu(OH)2 nanopesticide irrespective of NPF, AI or NR when soil solutions were used instead of ultrapure water. The sedimentation rate constants of AI and NPF were 0.023 min−1 and 0.010 min−1 in the ultrapure water, whereas the rate constants of 0.003–0.021 min−1 and 0.002–0.007 min−1 were observed for AI and NPF in soil solutions, respectively. Besides aggregation and sedimentation, dissolution of Cu(OH)2 nanopesticide in soil solutions was highly dependent on soil type, wherein pH and organic matter played important roles in dissolution. Although the final concentrations of dissolved copper (1.08–1.37 mg/L) were comparable among different soil solutions incubating 48 mg/L of AI, NPF or NR for 96 h, a gradual increase followed by an equilibrium was only observed in the soil solution from acidic soil (pH 5.16) with the low content of organic matter (1.20 g/kg). This work would shed light on the fate of Cu(OH)2 nanopesticide in the soil environment, which is necessary for risk assessment of the nanomaterials-based agrochemical.

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Section: Methodsmentioning

confidence: 99%

Aggregation, Sedimentation and Dissolution of Cu(OH)2-Nanorods-Based Nanopesticide in Soil Solutions

Tang

Hong

et al. 2022

Nanomaterials

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“…19 Among these, biopesticides have emerged as attractive alternatives to synthetic agrochemicals. Despite the growing interest in the impact of nanopesticides on soil, 20,21 there is still a lack of knowledge on the harmful potential of nanobiopesticides or natural pesticides based-nanoformulations on the soil environment.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Fate of Superparamagnetic Iron Oxide Nanoparticles Carrying Usnic Acid as Chemical Cargo on the Soil Microbial Community

et al. 2023

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In the present study we evaluate the effect of superparamagnetic iron oxide nanoparticles (SPIONs) carrying usnic acid (UA) as chemical cargo on the soil microbial community in a dystrophic red latosol (oxysol). Herein, 500 ppm UA or SPIONs-framework carrying UA were diluted in sterile ultrapure deionized water and applied by hand sprayer on the top of the soil. The experiment was conducted in a growth chamber at 25 °C, with a relative humidity of 80% and a 16 h/8 h light–dark cycle (600 lx light intensity) for 30 days. Sterile ultrapure deionized water was used as the negative control; uncapped and oleic acid (OA) capped SPIONs were also tested to assess their potential effects. Magnetic nanostructures were synthesized by a coprecipitation method and characterized by scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), zeta potential, hydrodynamic diameter, magnetic measurements, and release kinetics of chemical cargo. Uncapped and OA-capped SPIONs did not significantly affect soil microbial community. Our results showed an impairment in the soil microbial community exposed to free UA, leading to a general decrease in negative effects on soil-based parameters when bioactive was loaded into the nanoscale magnetic carrier. Besides, compared to control, the free UA caused a significant decrease in microbial biomass C (39%), on the activity of acid protease (59%), and acid phosphatase (23%) enzymes, respectively. Free UA also reduced eukaryotic 18S rRNA gene abundance, suggesting a major impact on fungi. Our findings indicate that SPIONs as bioherbicide nanocarriers can reduce the negative impacts on soil. Therefore, nanoenabled biocides may improve agricultural productivity, which is important for food security due to the need of increasing food production.

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Fate of copper in soil: effect of agrochemical (nano)formulations and soil properties

Abstract: Nanotechnology may be used to design more performant copper agrochemicals. Assessing the benefits and risks of the novel nano-products requires a good understanding of their fate in soil relative to...

Cited by 2 publications

References 49 publications

Aggregation, Sedimentation and Dissolution of Cu(OH)2-Nanorods-Based Nanopesticide in Soil Solutions

Aggregation, Sedimentation and Dissolution of Cu(OH)2-Nanorods-Based Nanopesticide in Soil Solutions

Assessing the Fate of Superparamagnetic Iron Oxide Nanoparticles Carrying Usnic Acid as Chemical Cargo on the Soil Microbial Community

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