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GUAN Ming ZHENG De |ming YU Ya |qin ZHAO Jie |xu BI Wen |xiang WU Di LING Jing DU Wei XIA Yu |Yong GAO Shen SUN Wei |wei GUAN Ci |nan WANG Yan |li 《环境科学学报(英文版)》2000,(Z1)
Inrecentyears,mercurycontaminationhasbeen paid greatattentiontoovertheworld(Zilloux ,1993;Monamy ,1993;Guan ,1994;Yang ,1992 ;Li,1993;1994;SCOPE ,1994) .TheprincipalfocusistodecreaseHgcontaminationinordertoprotecttheecosystemenvironmentandthehuman’shealth .Itisdifferentfrom“mi… 相似文献
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The degradation of the insect growth regulator 1-(2-chlorobenzoyl)-3-(4-chlorophenyl)urea (CCU)was studied both in distilled water and in buffer solution.The experimental results indicated that CCU is not stable in aqueous solution and easily decomposes in alkaline water.At pH 6 and pH 10,the half lives (Tv2)of hydrolysis arc about 9 days and 2 days,respectively.The rate of hydrolysis increases as either the concentration of alkalinity or temperature increases.At [NaOH]=0.01865 mol/L,with every lOoC increase in temperature,the reaction rate increases about 3 times.the activation energy for hydrolysis is 7l.56 kJ/mol.Basic catalyzed degradation of CCU at levels greatly above its solubility in water resulted in rapid degradation to as many as four identified products:(4-chlorophenyl)urea,2-chlorobenzoic acid,2-chlorobenzamide,and 4-chloroaniline.The major products were(4-chlorophenyl)urea and 2-chlorobenzoic acid. 相似文献
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论生态旅游区开发中的景观设计 总被引:5,自引:0,他引:5
以回归大自然为主题的生态旅游已逐步成为旅游主导形式,在风景区开发生态旅游,景观设计水平的高低,是景区能否获得健康发展的重要决定因素,文中从生态旅游区景观设计的内涵,特征,层次等方面系统论述了景观设计生态旅游区开发中的重要意义,并重点阐述了各种创作手法在生态旅游区景观设计中的运用。 相似文献
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