【摘要】 采用荧光分析方法,对不同pH条件下3个填埋年限渗滤液中水溶性有机物(DOM)的荧光特性进行了研究。同步荧光光谱表明,填埋1年及10年渗滤液DOM的同步荧光图中各峰的荧光强度pH 4时最强;填埋5年渗滤液DOM在pH 12时荧光强度最强,而pH 4时的荧光强度次之。渗滤液DOM三维荧光光谱表明,填埋1及5年类蛋白峰强度在pH 10达到最大,而填埋10年在pH 8荧光强度最强;可见区类富里酸峰强度在pH=10达到最大值,而紫外区类富里酸峰较强的荧光强度则分别在pH 4和10时;与类富里酸物质相比,类蛋白物质更容易受pH的影响。紫外区类富里酸荧光强度与可见区类富里酸荧光强度比值[r(A,C)]受pH的变化影响较大,因此,当比较不同来源DOM的r(A,C)值时,应使其pH处于同一水平。更多还原

【Abstract】 Due to its high sensitivity,good selectivity and nondestructivity nature,fluorescence technique is suitable to the study of DOM.In the present study,fluorescence characteristics of dissolved organic matter(DOM) from three different ages of landfill leachate(1a,5a,10a) under different pH value were investigated.The fluorescence synchronous scan spectroscopy showed that,in addition to the characteristic each age of landfill leachate owned separately,DOM from three ages of landfill leachate shared some common characteristics with the change in pH as follows: the fluorescence peaks of DOM exhibited in synchronous scan spectroscopy from 1 and 5-year-old leachate showed the maximum fluorescence intensity at pH 5,while that of DOM from 10-year-old landfill leachate appeared at pH 12,and the fluorescence intensity of most fluorescence peaks of DOM from 10-year-old landfill leachate exhibited in synchronous scan spectroscopy at pH 4 ranked second.The three-dimensional fluorescence excitation-emission matrix spectroscopy(3DEEM) suggested that the fluorescence intensity of the protein-like peaks of DOM from all three ages of landfill leachate increased with pH value increasing,and the maximum fluorescence occurred at pH 10,while that of DOM from 10-year-old appeared at pH 8;the fluorescence intensity of the visible fulvic-like peaks of DOM from all three ages of landfill leachate was enhanced with pH increasing,and exhibited the maximum fluorescence intensity at pH 10,while the relation curve between the fluorescence intensity of the UV fulvic-like and pH value of DOM from all three year ages of landfill leachate exhibited two peaks,one occurred at pH 4,and the other appeared at pH 10.3 DEEM also indicated that compared to the fluvic-like matter,the protein-like matter was more easily influenced by pH value.The relation between the r(A,C) value and pH value suggested that the former relied on the latter.If we would compare the r(A,C) values of DOM originating differently,the authors should compare each other under the same pH value.更多还原