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The Uptake, Accumulation and Phytotoxicity of CuO Nanoparticles

Author: YangYuanQiang
Tutor: ShiJiYan
School: Zhejiang University
Course: Environmental Engineering
Keywords: Nano - copper oxide Plant Absorption and Transport Poison
CLC: X173
Type: Master's thesis
Year: 2012
Downloads: 58
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Abstract

Nano metal oxide due to its unique electrical, magnetic, catalytic properties, high-temperature superconductivity, organic catalysis, sensors, electrode materials have a wide range of application prospects and great potential for development, is being more and more attention. Potential ecological toxicity and environmental risks of nano metal oxide has gradually become a hot topic. Certain types of nanoparticles can be absorbed by plant roots conclusions have been reported, but there are still a lot of controversy about the plants ability to absorb into the root nanoparticles in vivo transporter. As a nano-metal oxide, nano-copper oxide (CuONPs) are being widely used in anti-corrosion coatings, inks, plastics manufacturing, antimicrobial coatings other vessels. This topic as a model plant the copper patience and enrichment plants - Haizhou Elsholtzia and common varieties of vegetables - cucumber add the different concentration CuONPs (0,100 mg / L indoor, 200 mg / L, 500 mg / L 1000 mg / L), and CuONPs Rorison nutrient solution released comparable doses of soluble copper (0.5 mg / L) hydroponic experiments, studies of plant uptake and accumulation of CuONPs CuONPs plants toxic effects. The main conclusions are as follows: in the under the CuONPs, the organizations of the two plants in copper accumulation in both significantly higher than 0.5 mg / L soluble Cu treatment or control group after the treatment of 1000 mg / L CuONPs Haizhou Elsholtzia stem copper accumulation in leaves to reach 110.2mg/kg and 90.8mg/kg, much higher than 0.5 mg / L soluble Cu treatment group (32.5 mg / kg and 25.3 mg / kg) and the control group (18.3mg/kg and 13.8 mg / kg). TEM-EDS results show Two CuONPs processing plant root, stem, leaves tissue found that particles of sediment, and the copper content of the sediments were higher than the background value, suspected as CuO particle deposition. μ-XANES fitting results show that the accumulation of copper in the different organizations of the two plants under CuONPs processing, CuONPs similar bound a substantial proportion, up to 43.5% and 47.2% in Haizhou Elsholtzia and cucumber leaves, but the early ion state copper processing experiments not found in plants the CuONPs similar bound. The above results show that CuONPs can uptake by plant roots was up transit to the plant stems, leaf tissue at. Compared with the control group, the chlorophyll content and biomass of two plants in the CuONPs processing decreased the content of MDA increased significantly; 0.5 mg / L the soluble Cu treatment group did not appear similar phenomenon. This indicates that the ion Cu toxicity of CuONPs does not come directly from the limited dissolution, but from nano particulate and the nanoparticle state of CuO toxic than the dissolution of soluble Cu in solution. Of contrast CuONPs sea state of Hong Ru and cucumber copper absorption cumulative capacity, and growth inhibition condition, found that the same dose of CuONPs processing sea state of Hong Ru of the organizations in the copper of the cumulative amount of all higher than the cucumber, shows that as the copper enrichment plant Haizhou Hong Ru higher enrichment CuONPs same characteristics; However, in this study there is no clear evidence that as copper-tolerant plants Elsholtzia splendens CuONPs tolerance characteristics than ordinary plants, so the relevant conclusions drawn need to be further research.

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