Journal
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
Volume 43, Issue 4, Pages 1655-1672Publisher
SPRINGER
DOI: 10.1007/s10653-021-00857-7
Keywords
Haplic Chernozem; Macro; and nanosized CuO; XRD; XANES; EXAFS; Toxic effect
Categories
Funding
- Russian Science Foundation [19-74-00085]
- Russian Science Foundation [19-74-00085] Funding Source: Russian Science Foundation
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This study investigated the influence of CuO nanoparticles on soil and plants, revealing that nanosized CuO undergoes stronger transformation and higher toxicity, leading to negative effects on the growth of spring barley.
In recent years, the study of the influence of nanoparticles (NPs) on the environment has attracted much interest as nanotechnology is becoming the key technology of the future generation. The comparative studies on the effects of macro- and nanosized copper oxide (CuO) on plants rarely cover the state and behaviour of CuO in the soil-plant system. This work considers the transformation of CuO in Haplic Chernozem depending on the degree of dispersion and its toxic effects on spring barley (Hordeum sativum) growth. To investigate the transformation of the studied particles of metal oxide in the soil and plant, both chemical method of analysis and synchrotron radiation X-ray powder diffraction, X-ray absorption near-edge structure spectroscopy (XANES) and X-ray absorption fine-structure spectroscopy (EXAFS) were used. It was shown that CuO NPs underwent a stronger transformation due to the high reactivity of smaller particles. The Cu mobility was observed to increase within the soil profile as confirmed by the model pollution experiment. This is mainly due to the formation of complex forms of metal with organic matter. A dose of 300 mg/kg of macro- and nanosized CuO did not significantly affect the development and productivity of spring barley. The effect of high doses of macro- and nanosized CuO (2000 and 10,000 mg/kg) had a negative impact on the growth of spring barley. The application of nanosized CuO had a greater toxic effect than the macrosized CuO on the plants. The XANES and EXAFS data revealed that CuO NPs accumulated in the soil and plants. The linear combination fit shown that Cu atoms, incorporated into the plants, have environment typical of CuO. This indicates a high environmental risk when soil is contaminated with CuO NPs compared with its arrival as CuO.
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