INFLUENCE OF SOIL pH ON SURFACE CHARGE AND WATER TRANSMISSION

1971 ◽  
Vol 51 (2) ◽  
pp. 277-282
Author(s):  
T. G. SOMMERFELDT ◽  
J. C. VAN SCHAIK
Keyword(s):  
Surface Charge ◽  
Electrophoretic Mobility ◽  
Soil Ph ◽  
Effective Means ◽  
Rate Of Change ◽  
Sodic Soil ◽  
Effects Of Ph ◽  
Water Transmission

The effects of pH were determined on the exchangeable Na and electrophoretic mobility of Na-saturated bentonite from Greybull, Wyoming, and Na-saturated Lethbridge loam and on the water transmission of the Lethbridge loam. The data obtained were related to problems of reclaiming an alkaline-sodic soil. The exchangeable Na of the bentonite and the loam increased about 50% from pH 6.0 to 8.0, but the rate of change with pH was not the same for both. The electrophoretic mobility of the loam increased 284% from pH 6.0 to 8.0, while that of the bentonite increased 53%. The water transmission of the loam at pH 6.5 and 7.0 was seven times and twice, respectively, that at pH 8.0. It was concluded that lowering the pH of an alkaline-sodic soil may be an effective means of enhancing its reclamation.

Carbonate chemistry, pH, and physical properties of an alkaline sodic soil as affected by various amendments

Soil Research ◽  
1997 ◽  
Vol 35 (1) ◽  
pp. 149 ◽  
Author(s):  
M. Chorom ◽  
P. Rengasamy
Keyword(s):  
Soil Solution ◽  
Soil Ph ◽  
Green Manure ◽  
Interactive Effect ◽  
Aggregate Stability ◽  
Co2 Production ◽  
Carbonate Chemistry ◽  
Sodic Soil ◽  
Mechanical Dispersion ◽  
Effects Of Ph

A greenhouse experiment evaluated the chemical and physical changes of a Natrixeralf (with alkaline pH 9·4 and 5% CaCO3), as influenced by the changes in carbonate chemistry, pH, and particle charge following the application of gypsum, green manure, and glucose. Gypsum reduced the pH from 9·38 to 7·89, increased Ca2+ in soil solution, and decreased the sodium adsorption ratio (SAR1:5) from 11·6 to 1·2. Green manure, due to increased CO2 production, reduced the pH to 8·68 and SAR1:5 to 7·52. Green manure plus gypsum reduced pH to 7·67 and SAR1:5 to 0·91. The interactive effect of gypsum and green manure on all soil properties was highly significant as shown by ANOVA analysis. Reduction of soil pH was also reflected in the levels of carbonates in the soil solution. Addition of glucose increased the microbial activity and produced fatty acids. The drastic reduction in pH (<6·0) was related to the amount of glucose added. The concentrations of Ca 2+ and carbonates, and SAR1:5 values, were inversely related to the soil pH after glucose addition. The data on soluble Na2CO3 and NaHCO3, zeta potential, mechanical dispersion, aggregate stability, and saturated hydraulic conductivity confirm the effects of pH reduction and carbonate solubility as influenced by the amendments in alkaline sodic soil.

The ζ-Potential of Kaolinite Particles

1956 ◽  
Vol 9 (4) ◽  
pp. 450 ◽  
Author(s):  
N Street ◽  
AS Buchanan
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Electrophoretic Mobility ◽  
Surface Charge Density ◽  
Considerable Increase ◽  
Ionic Species ◽  
Ζ Potential ◽  
Potentiometric Titrations ◽  
Kaolinite Suspension

Electrophoretic mobility measurements, and both conductometric and potentiometric titrations, were carried out on a kaolinite suspension throughout its neutralization by various bases. The concentration of the ionic species present was calculated from the conductometric and potentiometric titrations, and the true ζ-potential calculated from the electrophoretic mobility by Stigter and Mysels's (1955) method. The results indicate that a discontinuity exists in the adsorption of ions in the vicinity of pH 6.5-7.0 causing a considerable increase in the surface charge density of the particles.

Surface Charge ofTrypanosoma cruzi.Binding of Cationized Ferritin and Measurement of Cellular Electrophoretic Mobility*

1977 ◽  
Vol 24 (3) ◽  
pp. 411-415 ◽  
Author(s):  
WANDERLEY DE SOUZA ◽  
CARLOS ARGUELLO ◽  
ADOLFO MARTINEZ-PALOMO ◽  
DOROTHEA TRISSL ◽  
ARTURO GONZÁLES-ROBLES ◽  
...  
Keyword(s):  
Surface Charge ◽  
Electrophoretic Mobility ◽  
Cationized Ferritin

Electrophoretic Mobility and Primitive Models:  Surface Charge Density Effect

2002 ◽  
Vol 106 (27) ◽  
pp. 6881-6886 ◽  
Author(s):  
A. Martín-Molina ◽  
M. Quesada-Pérez ◽  
F. Galisteo-González ◽  
R. Hidalgo-Álvarez
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Electrophoretic Mobility ◽  
Surface Charge Density ◽  
Density Effect

Using variable charge characteristics to understand the exchangeable cation status of oxic soils

Soil Research ◽  
1984 ◽  
Vol 22 (1) ◽  
pp. 71 ◽  
Author(s):  
GP Gillman
Keyword(s):  
Surface Charge ◽  
Soil Ph ◽  
Negative Charge ◽  
Positive Charge ◽  
Exchangeable Cations ◽  
Point Of Zero Charge ◽  
Exchangeable Cation ◽  
Charge Measurement ◽  
Variable Charge ◽  
Variable Surface

The model of Uehara and Gillman was used to estimate the amounts of permanent surface charge, and variable surface charge at soil pH, in two soils from the high rainfall region of coastal Queensland. For each soil series, samples from virgin rain-forest were compared with soil collected from nearby sugarcane fields. One soil contained relatively large amounts of permanent negative charge (up to 3 m.e. per 100g), and hence was moderately supplied with exchangeable cations, while the other soil was dominated by variable charge components and at soil pH contained sufficient positive charge to reduce exchangeable cations to near zero values, despite the presence of about 1 m.e. per 100 g of permanent negative charge. In the latter the position of soil pH with respect to the point of zero charge is of utmost importance for the development of cation exchange capacity. The effect of adsorbed sulfate on positive charge measurement, and valency of the ion used for negative charge measurement, are briefly discussed.

Potassium reserves in British soils. I. The Rothamsted Classical Experiments

1968 ◽  
Vol 71 (1) ◽  
pp. 95-104 ◽  
Author(s):  
O. Talibudeen ◽  
S. K. Dey
Keyword(s):  
Soil Ph ◽  
Buffer Capacity ◽  
Acid Soils ◽  
Clay Content ◽  
Laboratory Method ◽  
Rate Of Change ◽  
Partial Recovery ◽  
Field Crop ◽  
Buffer Capacities ◽  
The Relationship

SummaryThirty-four soils from the Rothamsted Experiments were exhaustively cropped with ryegrass in the glasshouse. The concentration and yield of potassium in ryegrass tops and the potassium intensity in the soil were measured every 4 weeks, after harvesting the grass.The change in K-intensity of soils, rich in potassium, with exhaustion differed from that of ‘poor’ soils. This change was related to the rate of change of the cumulative K-yield. The rate of change of soil K-intensity demarcated periods of intense and limited exhaustion and partial recovery of the soil during cropping.The cumulative K-yield of ryegrass was very significantly related to the K-intensity of the uncropped soil; the ‘16-week’ yield was slightly better related than the ‘60-week’ yield. For Park Grass soils, the relationship was improved by allowing for variations in soil pH.The K-intensity of all soils, with or without manuring, decreased to nearly 10-3 (M)½ in (AR)0 units after 16 weeks cropping, although large differences in K-yield persisted until much later.K-buffer capacity per unit clay content of the soil, measured by a laboratory method, was inversely related to the K-intensity of the uncropped soil. The K-buffer capacities of soils rich in potassium, measured in laboratory and glasshouse experiments, were significantly related, but were unrelated for ‘poor’ soils. The K-buffer capacity (laboratory method) of Rothamsted soils with different manurial treatments was only very approximately related to the cumulative K-yield.Less K was taken up from all Rothamsted soils given nitrogen fertilizer in the field and their K intensities were also smaller than the corresponding soils without ‘N’. Field liming of acid soils decreased their K-intensity and increased their K-buffer capacity, presumably because more potassium was removed by the field crop.A rapid method is suggested for measuring potassium intensities of soils.

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