Transport and re-entrainment of soil colloids in saturated packed column: effects of pH and ionic strength
文献类型：期刊论文
| 作者 | Zhou, Dongmei1; Wang, Dengjun1,2; Cang, Long1; Hao, Xiuzhen1; Chu, Lingyang1,3 |
| 刊名 | JOURNAL OF SOILS AND SEDIMENTS
 |
| 出版日期 | 2011-04-01 |
| 卷号 | 11期号:3页码:491-503 |
| 关键词 | Cotransport DLVO theory Ionic strength (IS) pH Water-dispersible soil colloids (WDSC) |
| ISSN号 | 1439-0108 |
| DOI | 10.1007/s11368-010-0331-2 |
| 通讯作者 | Zhou, Dongmei(dmzhou@issas.ac.cn) |
| 英文摘要 | Colloid migration in subsurface environments has attracted considerable attention in recent years because of its suspected role in facilitating transport of strongly adsorbed contaminants to groundwater. The influence of bulk solution pH or ionic strength on model colloid (i.e., latex microsphere, amorphous silica colloids) transport is well established, while little attention has been paid to water-dispersible soil colloids. In this study, saturated packed columns were conducted to explore the mechanism of transport and fate of water-dispersible soil colloids and facilitating transport of Cu during transients in solution chemistry. Water-dispersible soil colloids were fractionated from a Cu-contaminated soil sample. Transport of soil colloidal suspensions was conducted with varying pH and ionic strengths, and then, re-entrainment of those retained colloids after completion the transport experiments was conducted by changing pore water solution transient ionic strength and pH conditions. Meanwhile, transport and fate of the Cu strongly adsorbed on the soil colloids were determined under different ionic strength conditions. The transport behavior of soil colloids in porous media was found to depend on the pH and ionic strengths of bulk solution. An increase in solution ionic strength and decrease in solution pH resulted in greater deposition which was revealed by the collision efficiency (alpha). It increased from 0.15 to 1.0 when solution composition changed from 0 to 50 mM NaNO(3) and decreased dramatically from 1.0 to 0.035 as the solution pH converted from 2.97 to 8.94. The results were in agreement with Derjaguin-Landau-Verwey-Overbeek theory. Upon stepwise reduction in ionic strength of eluting fluid or enhancement in its pH, a sharp release of colloids retained in the column occurred in each step. Meanwhile, the value of FRE (NaOH) that reveals the effect of NaOH solution at pH 11 on the mobilization of retained colloids deposited in the primary minimum increased from 38.6% to 64.6% when the ionic strength of bulk solution changed from 0 to 50 mM NaNO(3) and decreased from 86.7% to 35.8% as the solution pH from 2.97 to 8.94. In addition, the transport and fate of the Cu strongly adsorbed on soil colloids were highly consistent with the results of soil colloids. The colloid collision efficiency (alpha) decreased as the pH of bulk solution increased and increased as the ionic strength of bulk solution increased in saturated columns packed with pure quartz sand, and NaOH solution at pH 11 poses a predominant role on mobilization of the retained colloids deposited in the primary minimum. Meanwhile, the strongly adsorbed Cu on soil colloids almost cannot be detached from its carrier under the competition of coexisted cations in the bulk solution and cotransport with its carrier under different ionic strengths. |
| 收录类别 | SCI |
| WOS关键词 | TRANSIENT-CHEMICAL CONDITIONS ; POROUS-MEDIA ; ORGANIC-MATTER ; FILTRATION THEORY ; CLAY-MINERALS ; HUMIC-ACID ; DEPOSITION ; PARTICLES ; KINETICS ; WATER |
| WOS研究方向 | Geology ; Agriculture |
| WOS类目 | Geosciences, Multidisciplinary ; Soil Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000288964700011 |
| 出版者 | SPRINGER HEIDELBERG |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558996 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Zhou, Dongmei |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Inst Soil Sci, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Anhui Agr Univ, Coll Resources & Environm Sci, Hefei 230036, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Dongmei,Wang, Dengjun,Cang, Long,et al. Transport and re-entrainment of soil colloids in saturated packed column: effects of pH and ionic strength[J]. JOURNAL OF SOILS AND SEDIMENTS,2011,11(3):491-503. |
| APA | Zhou, Dongmei,Wang, Dengjun,Cang, Long,Hao, Xiuzhen,&Chu, Lingyang.(2011).Transport and re-entrainment of soil colloids in saturated packed column: effects of pH and ionic strength.JOURNAL OF SOILS AND SEDIMENTS,11(3),491-503. |
| MLA | Zhou, Dongmei,et al."Transport and re-entrainment of soil colloids in saturated packed column: effects of pH and ionic strength".JOURNAL OF SOILS AND SEDIMENTS 11.3(2011):491-503. |
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来源：南京土壤研究所
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