HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (13) Citing Articles via Google Scholar Google Scholar Articles by Kjaergaard, C. Articles by Jacobsen, O. H. Search for Related Content PubMed Articles by Kjaergaard, C. Articles by Jacobsen, O. H. GeoRef GeoRef Citation Agricola Articles by Kjaergaard, C. Articles by Jacobsen, O. H. Related Collections Fate Laboratory Column Studies Colloids Colloid-Facilitated Transport

Colloid Mobilization and Transport in Undisturbed Soil Columns. II. The Role of Colloid Dispersibility and Preferential Flow

^a Environmental Engineering Section, Dep. of Life Sciences, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark
^b Dep. of Agroecology, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark
^c Currently Danish Institute of Agricultural Sciences, Department of Agroecology, P.O. Box 50, DK-8830 Tjele, Denmark

View larger version (40K): [in a new window]   Fig. 1. Conceptualization of the processes involved in colloid mobilization in structured soils (a) the diffusive displacement of high–ionic strength intraaggregate water with low–ionic strength infiltration water, (b) the actual dispersibility of the colloids, and (c) the diffusion of colloids from the immobile intraaggregate water to the mobile convective water.

View larger version (18K): [in a new window]   Fig. 2. Examples of development of effluent outflow rates as a function of time after initiation of rainwater irrigation at 12 and 43% clay with initial matric potentials (IMP) of –2.5, –100, and –15500 hPa.

View larger version (13K): [in a new window]   Fig. 3. Average values of early tritium breakthrough, expressed as the number of pore volumes eluted when 12.5% of the applied tritium has been leached. Error bars: ±SE.

View larger version (30K): [in a new window]   Fig. 4. Effluent colloid concentration against number of eluted pore volumes (V/V0) as a function of clay content and initial matric potential (IMP). Replicate columns are represented by different symbols.

View larger version (41K): [in a new window]   Fig. 5. Measured total organic C (TOC, filled symbols) and estimated particulate organic C (POC, open symbols) against number of eluted pore volumes (V/V0) as a function of clay content and initial matric potential (IMP). Replicate columns are represented by different symbols.

View larger version (13K): [in a new window]   Fig. 6. Effect of clay content and initial matric potential (IMP) on (a) accumulated colloid mass leached after three pore volumes, (b) accumulated total organic C (TOC) leached after three pore volumes, and (c) amount of low-energy water-dispersible colloids (LE-WDC) from Kjaergaard et al. (2004a). Error bars: ±SE.

View larger version (36K): [in a new window]   Fig. 7. Plot of accumulated colloid mass (filled symbols) and electric conductivity (EC, open symbols) against square root of time for 12, 18, and 28% clay and initial matric potential (IMP) of –2.5, –100, and –15500 hPa. Dotted lines mark leaching of one pore volume. Replicates are represented by different symbols.