Study of the Mobility of Cerium Oxide Nanoparticles in Soil Using Dynamic Extraction in a Microcolumn and a Rotating Coiled Column
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Currently, nanomaterials are widely used in various fields of human activity, which inevitably leads to their release into the environment, and soils are one of the main reservoirs for nanoparticles. As nanoparticles can be particularly toxic to living organisms, the development of new approaches to the assessment of their behavior and mobility in soils is an important task. In this paper, the analytical possibilities of the dynamic extraction of CeO2 nanoparticles in a microcolumn (MC) and a rotating coiled column (RCC) are studied to evaluate the behavior of nanoparticles in soil. Differential and integral elution curves of CeO2 nanoparticles from the soil were obtained based on the data of eluate analysis by inductively coupled plasma–mass spectrometry. After pumping 100 mL of water through a microcolumn and a rotating coiled column, 0.15 and 1.37 µg of CeO2 nanoparticles are leached from the soil, respectively, which is 0.2 and 1.6% of the nanoparticles introduced. The ratio of CeO2 nanoparticles and soil mineral particles is two times higher in the MC eluate. It is found that the rotating coiled column enables the estimation of nanoparticles maximum mobility of nanoparticles in soil because of the minimization of the effect of its structure on their transport. The microcolumn, preserving the soil structure, ensures the estimation of the mobility of nanoparticles in a real soil column most accurately. We also studied the effect of the modification of the surface of CeO2 nanoparticles with citric acid on their mobility in soil. CeO2 nanoparticles modified with citric acid have higher mobility in soil compared to unmodified nanoparticles.
Keywords:soil chernozem nanoparticles cerium oxide mobility
The authors are grateful to O.B. Rogova (Dokuchaev Soil Institute, Moscow) for providing the soil sample.
This work was supported by the Russian Science Foundation, project no. 17-73-10338.
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