| .黑土组分吸附2，4-二硝基甲苯的特征研究[J].农业环境科学学报,2013,32(2):. |
| 黑土组分吸附2，4-二硝基甲苯的特征研究 |
| Sorption of 2,4-Dinitrotoluene to Black Soil Components |
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| DOI：10.11654/jaes.2013.02.009 |
| 中文关键词: ２，4-二硝基甲苯 吸附 有机质 无机矿物 |
| 英文关键词: 2,4-dinitrotoluene sorption organic matter clay minerals |
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| 摘要点击次数: 1938 |
| 全文下载次数: 1642 |
| 中文摘要: |
| 选用2，４－二硝基甲苯（２，４－ＤＮＴ）作为有毒硝基污染物代表，黑土作为典型的土壤代表，采用摇瓶法，研究了原土土样、去除腐植酸和富里酸土样以及去除有机质后的土样对２，４－ＤＮＴ的吸附特征。在此基础上，采用铯离子交换饱和土样的方法，研究了黑土的无机矿物组分经离子饱和后对２，４－ＤＮＴ吸附特征，探讨了黑土有机和无机组分对吸附２，４－ＤＮＴ的相对贡献。研究发现，与２，４－ＤＮＴ在原土上的吸附相比较，去除腐植酸和富里酸组分对２，４－ＤＮＴ的吸附影响甚微，而完全去除黑土有机质后导致２，４－ＤＮＴ的吸附降低了近一个数量级，可见黑土有机质中不能被ＮａＯＨ提取的组分（主要是腐黑物，干酪根和黑碳）是影响２，４－ＤＮＴ吸附能力的主导因素。同时还发现，非极性有机物１，３－ＤＣＢ与极性有机物２，４－ＤＮＴ在土壤上的吸附主控机制不同，前者以疏水作用占主导，而后者主要受非疏水作用控制。另外，无机矿物组分不是影响２，４－ＤＮＴ在黑土上吸附的主导因素，只有当水合性较弱的铯离子作为无机矿物的饱和离子时，无机矿物组分对２，４－DNT的强烈吸附才能显现出来。 |
| 英文摘要: |
| Selecting 2,4-dinitrotoluene（2,4-DNT） as a toxic nitro-pollutant representative and black soil as a typical soil representative, the sorption of 2,4-DNT in various samples such as original soil, humic and fulvic acids free soil and organic fractions free soil samples were investigated by batch sorption experiments. We further studied sorption of 2,4-DNT in inorganic mineral fractions saturated and exchanged with cesium ion, and the relative contributions of the organic and inorganic components of soil to sorption of 2,4-DNT were investigated. Results showed that, comparing with adsorption of 2,4-DNT to original soil, removing mainly humic and fulvic acids of black soil had little influence on the sorption of 2,4-DNT, however, complete removal of the organic fraction decreased the sorption by nearly an order of magnitude. This indicated that non-NaOH extractable organic fraction（humin/kerogen and black carbon）of black soil was considered to be the dominant factors to the sorption of 2,4-DNT. The sorption mechanisms were quite different for apolar compound 1,3-DCB and polar compound 2,4-DNT. Sorption of 1,3-DCB was dominated by hydrophobic effect, however, non-hydrophobic sorption was driving forces for sorption of 2,4-DNT. Otherwise, inorganic mineral component in black soil was not the predominant component that contribute to the overall sorption of 2,4-DNT. Only when inorganic mineral was saturated with weakly hydrated cesium ion, 2,4-DNT showed strong adsorption affinity to inorganic mineral. |
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