Aquatic toxicity of di (2-eihylhexyl) phthalate to duckweeds  

作　　者：徐刚 刘宁 吴明红 郭瑞云 周佳欣 施文彦 李发生 

机构地区：[1]School of Environmental and Chemical Engineering,Shanghai University [2]Department of Soil Pollution Control,Chinese Research Academy of Environmental Sciences

出　　处：《Journal of Shanghai University(English Edition)》2010年第2期100-105,共6页上海大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.40973073,40830744);the Shanghai Leading Academic Discipline Project (Grant No.S30109);the National Key Technology Research and Development Program in the 11th Five Year Plan of China (Grant Nos.2008BAC32B03,2009BAA24B04);the Natural Science Foundation of the Science and Technology Commission of Shanghai Municipality (Grant No.09ZR1411300)

摘　　要：This study is concerned with the effects of di （2-ethylhexyl） phthalate （DEHP） on two kinds of duckweeds （Spirodela polyrhiza and Lemna minor）.The results indicate that DEHP has aquatic toxicity to Spirodela polyrhiza at 0.4 mg/L and to Lemna minor at over 0.1 mg/L by changing their physiologic-biochemical characteristics.The contents of duckweed chlorophyll and soluble protein decrease with increasing DEHP concentration after 7 d of exposure.DEHP shows the stimulating role in catalase （CAT） and superoxide dismutase （SOD） systems at relative low levels.At 0.01 mg/L and 0.005 mg/L,SOD activities of Spirodela polyrhiza and Lemna minor reach their peak values respectively,while CAT activity reaches its maximum value at 0.05 mg/L and 0.01 mg/L.When DEHP levels are too high,the protection enzyme system would be destroyed and plant growth is inhibited.The analysis of malondialdehyde （MDA） and Fourier transform infrared spectroscopy manifest that DEHP could affect the tested duckweeds by destroying its cell membranes,and Spirodela polyrhiza is more resistant to DEHP exposure than Lemna minor.This study is concerned with the effects of di （2-ethylhexyl） phthalate （DEHP） on two kinds of duckweeds （Spirodela polyrhiza and Lemna minor）.The results indicate that DEHP has aquatic toxicity to Spirodela polyrhiza at 0.4 mg/L and to Lemna minor at over 0.1 mg/L by changing their physiologic-biochemical characteristics.The contents of duckweed chlorophyll and soluble protein decrease with increasing DEHP concentration after 7 d of exposure.DEHP shows the stimulating role in catalase （CAT） and superoxide dismutase （SOD） systems at relative low levels.At 0.01 mg/L and 0.005 mg/L,SOD activities of Spirodela polyrhiza and Lemna minor reach their peak values respectively,while CAT activity reaches its maximum value at 0.05 mg/L and 0.01 mg/L.When DEHP levels are too high,the protection enzyme system would be destroyed and plant growth is inhibited.The analysis of malondialdehyde （MDA） and Fourier transform infrared spectroscopy manifest that DEHP could affect the tested duckweeds by destroying its cell membranes,and Spirodela polyrhiza is more resistant to DEHP exposure than Lemna minor.

关 键 词：di （2-ethylhexyl） phthalate （DEHP） DUCKWEED aquatic toxicity antioxidant enzyme 

分 类 号：X173[环境科学与工程—环境科学]