Poster De Conférence Année : 2024

Evaluation of the dynamics and impact of nanomagnetites (Fe3O4) on lettuce (Lactuca sativa) in a context of cadmium contaminated soil

Résumé

Soil contamination by toxic metals such as cadmium (Cd) is a major issue for our society. Over the last few decades, around 22,000 tonnes of Cd have been released into the environment worldwide. For soil remediation, several approaches have been tested. Due to their physicochemical properties and their nanometric size, nanomaterials have been receiving substantial growing attention. Among these nanoparticles, nanomagnetites (Fe3O4, NPs-Fe) have great potential for soil remediation. Evaluating the impact and fate of these nanoparticles therefore seems essential. This research aimed to evaluate the effect of nanomagnetites on lettuce (Latuca sativa) development and their role as an adjuvant to improve the phytoextraction efficiency of Cd in soils. In this context, nanomagnetite was applied (1.2 g kg-1 soil) to a Cd-contaminated soil (20 mg Cd kg-1 soil). Four conditions were tested: control, Cd, NPs-Fe and Cd+NPs-Fe. The plants were harvested, weighed, freeze-dried and analysed by ICP-MS after 46 days of exposure to determine metal concentrations. Photosynthetic yield measurements were also taken before harvesting. The dynamics of nanomagnetites from soil to plants were also studied by measurement of magnetic susceptibility. The results showed a negative impact of Cd and NPs-Fe on lettuce development, with a reduction in biomass of around 50% for each of the treatments alone and over 70% for the Cd+NPs-Fe treatment. While the analyses do not show any difference in Fe content between the 4 treatments, a significant difference is observed for plant Cd content, which is roughly two times higher under NPs-Fe treatments compared to control. Concerning the photosynthetic yield, a significant difference was only observed between control and Cd+NPs-Fe. Finally, a magnetic signal was detected in plants treated with NPs-Fe (NPs-Fe and Cd+NPs-Fe), indicating the presence of NPs-Fe in plant tissues. This study showed that at the concentrations tested, nanomagnetites have a negative impact on the development of lettuce plants, but significantly increase the plant Cd concentration. It could be interesting to study the effect of different concentrations of NPs-Fe on lettuce to complete this work.
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Dates et versions

hal-04912061 , version 1 (25-01-2025)

Identifiants

  • HAL Id : hal-04912061 , version 1

Citer

Nolenn Kermeur, Mathieu Pédrot, Francisco Cabello-Hurtado. Evaluation of the dynamics and impact of nanomagnetites (Fe3O4) on lettuce (Lactuca sativa) in a context of cadmium contaminated soil. SETAC Europe 34th, May 2024, Seville, Spain. . ⟨hal-04912061⟩
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