摘要:
采用静态吸附实验,研究不同粒径沉积物的基本性质及其对1,2,4,5-四氯苯吸附/解吸性能的影响.结果表明,不同粒径沉积物所含天然有机质(NOM)质和量的不同,导致其对1,2,4,5-四氯苯吸附性能的不同.颗粒最细的沉积物因其主要结合聚合度较低的无定型腐殖物质,导致1,2,4,5-四氯苯吸附等温线的非线性程度最低,在沉积物上的吸附亲和力和吸附-解吸滞后现象也最弱.而颗粒最粗的沉积物因为含有一些煤炭和木炭等高比表面积的碳黑类物质,NOM聚合度较高,导致1,2,4,5-四氯苯吸附等温线的非线性程度最高,在沉积物上的吸附亲和力和吸附-解吸滞后现象也最强.而粒径中等的沉积物本身的性质和吸附性能介于颗粒最粗和最细的两种组分之间.
关键词:
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沉积物
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粒径
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1
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2
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4
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5-四氯苯
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吸附/解吸
Abstract:
The sorption experiments were conducted to study the influence of different sediment grain diameter sizes on the sorption/desorption of 1,2,4,5-tetrachlorobenzene.The results showed that the subsamples of sediment with different grain diameter sizes contained different types of NOM,which resulted in dissimilar sorption/desorption characteristics of 1,2,4,5-tetrachlorobenzene on them.The subsample with the largest grain size contained predominately coaly,particular organic matter of the highest condensed NOM,which brought on the highest sorption nonlinearity,sorption affinity and sorption-desorption hysteresis.The finest sediment sub-sample with the lowest condensed amorphous organic matter exhibited the lowest sorption nonlinearity,sorption affinity and sorption-desorption hysteresis.The remaining subsamples showed sorption-desorption behaviors between these extremes.
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