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 HighWire Citing Articles via ISI Web of Science (4) Citing Articles via Google Scholar Google Scholar Articles by Communar, G. Articles by Keren, R. Search for Related Content PubMed Articles by Communar, G. Articles by Keren, R. GeoRef GeoRef Citation Agricola Articles by Communar, G. Articles by Keren, R. Related Collections Soil Physics

Equilibrium and Nonequilibrium Transport of Boron in Soil

Institute of Soil, Water and Environmental Sciences, the Volcani Center, Agricultural Research Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel

View larger version (24K): [in a new window]   Fig. 1. Boron adsorption isotherms for the soil, adjusted to three pH values of the background solution, at a total (CaCl2 + NaCl) concentration of 20 mmolc L–1 and sodium adsorption ratio (SAR) of 6. Experimental points and calculated lines are presented.

View larger version (20K): [in a new window]   Fig. 2. Dynamics of the adjustment of the soil columns to the various pHs.

View larger version (34K): [in a new window]   Fig. 3. Measured, predicted and fitted breakthrough curves for B adsorption and desorption on Columns (a) G1, (b) H, and (c) K1 at water flow rates u of 3.6 cm h–1. Dashed lines represent predictions made by using the LE model and the batch-measured isotherm parameters (Table 1) and solid lines were obtained by fitting the LE–NE model to the experimental breakthrough curves (best fit values for f and 0 are given in Tables 2).

View larger version (34K): [in a new window]   Fig. 4. Measured and predicted breakthrough curves for the transport of B in columns a) G1, b) H, and c) K1 under pulse injection conditions. Observed data points were taken from Fig. 3. Predictions were made by using the LE-NE model and an average rate coefficient 0 = 2.85. A pulse durations Tp = 5.85, 6.95, and 8.1 were used to simulate the experimental breakthrough curves from columns G1 (pH 6.9), H (pH 8.3), and K1 (pH 9.3), respectively.

View larger version (26K): [in a new window]   Fig. 5. Measured, fitted and predicted breakthrough curves for the transport of B in columns G2, 3 (pH 6.9) and K2, 3 (pH 9.3) at pore water velocity u of 3.6 and 0.16 cm h–1, respectively, under pulse injection conditions (Tp = 0.8). Solid lines represent BTCs obtained by the fitting the LE-NE model to the experimental data (at u = 3.6 cm h–1) (0 = 3.5 was obtained) and dashed lines represent predictions of the experimental data (at u = 0.16 cm h–1) by using the LE-NE model and 0 value of 39.