Nanoparticles are easily emitted from semiconductor industries. Green bean, lettuce and radish are important seasoning plants in Taiwan. The phytotoxicity of nanoparticles, such as SiO_2 and TiO_2, relative to the growth behavior of green bean, lettuce and radish were investigated in this study. Experimental methods followed EPA "Ecological Effects Test Guidelines OPPTS850.4200 Seed Germination Root Elongation Toxicity Test". The properties of SiO_2 and TiO_2 were identified using N_2 adsorption/desorption analyzer and TEM analysis. The root of green bean, lettuce and radish were observed under a light microscope. The seeds were exposed to concentrations of 0, 2, 10, 20, 200 and 2000 mg/L. The result showed that the growth depended on nanoparticles concentrations and the type of nanoparticles. Lettuce's root grow well at nanoparticles 200 mg/L. However, the root growth inhibited when the concentration of nanoparticles above 2000 mg/L.
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