Ion Activity Products in Soil Solutions

2015 ◽  
pp. 1-10 ◽  
Author(s):  
Hinrich L. Bohn
Keyword(s):  
Soil Solutions ◽  
Ion Activity ◽  
Ion Activity Products

Simplified estimates of ion-activity products of calcium oxalate and calcium phosphate in mouse urine

2011 ◽  
Vol 40 (4) ◽  
pp. 285-291 ◽  
Author(s):  
Hans-Göran Tiselius ◽  
Renato Ribeiro Nogueira Ferraz ◽  
Ita Pfeferman Heilberg
Keyword(s):  
Calcium Phosphate ◽  
Calcium Oxalate ◽  
Mouse Urine ◽  
Ion Activity ◽  
Ion Activity Products

Solubility and Ion Activity Products of Calcium Phosphate Minerals

1999 ◽  
Vol 28 (2) ◽  
pp. 530-536 ◽  
Author(s):  
W. F. Jaynes ◽  
P. A. Moore ◽  
D. M. Miller
Keyword(s):  
Calcium Phosphate ◽  
Ion Activity ◽  
Ion Activity Products

Degree of saturation with respect to CaCO3, CaMg(CO3)2, and CaSO4 for some thermal and mineral springs in the Southern Rocky Mountains, Alberta and British Columbia

1969 ◽  
Vol 6 (6) ◽  
pp. 1421-1430 ◽  
Author(s):  
R. O. van Everdingen
Keyword(s):  
British Columbia ◽  
Rocky Mountains ◽  
Hot Springs ◽  
Equilibrium Constants ◽  
Degree Of Saturation ◽  
Effect Of Temperature ◽  
Mineral Springs ◽  
Southern Rocky Mountains ◽  
Ion Activity ◽  
Ion Activity Products

Comparison of ion-activity products and equilibrium constants for solution of CaCO3, CaMg(CO3)2, and CaSO4 indicates that water from Fairmont Hot Springs and Banff Hot Springs, and from thermal springs in British Columbia, on Lussier River, Ram Creek and near Fording Mountain, are super-saturated with respect to CaCO3 and, to a lesser extent, with respect to CaMg(CO3)2. At other springs saturation occurs after water is discharged from the springs. In the case of hot springs this is caused by the rise in pH that accompanies loss of excess CO2 and, to a lesser degree, by evaporation; cooling of the water tends to lower the degree of saturation somewhat. At cold springs, increase in water temperature after discharge increases the degree of saturation. Only near-saturation with respect to CaSO4 is indicated for Miette Hot Springs, Fairmont Hot Springs, and Fording Mountain Springs; precipitation of CaSO4 may occur here owing to evaporation of part of the water; the effect of temperature on the degree of saturation is small.

A COMPARISON OF THREE METHODS FOR DETERMINING CALCIUM ION ACTIVITY IN SOIL SOLUTIONS

1988 ◽  
Vol 68 (2) ◽  
pp. 433-441 ◽  
Author(s):  
GERALD W. LUTWICK ◽  
GORDON R. WEBSTER ◽  
BYRON KRATOCHVIL
Keyword(s):  
Relative Error ◽  
Calcium Ion ◽  
Colorimetric Method ◽  
Calculation Methods ◽  
Selective Electrode ◽  
Soil Extracts ◽  
Soil Solutions ◽  
Ion Activity ◽  
Aqueous Species ◽  
Good Agreement

Calcium ion activity, (Ca2+), in 37 soil solutions was determined using species calculation, potentiometric (ion selective electrode), and colorimetric (tetramethylmurexide) methods. Agreement among the three estimates of (Ca2+) was tested by comparing the potentiometric and colorimetric methods to the species calculation method. Good agreement was observed between (Ca2+) estimates using the potentiometric and species calculation methods. Percent relative error between the two methods was less than 5% for 76% of the soil extracts and less than 10% for 85% of the soil extracts. Differences are thought to be related to interference from H+, Na+, K+, and Mg2+ above certain concentrations. The colorimetric and species calculation methods agreed poorly in their estimates of (Ca2+) in soil solutions. Relative error was less than 20% for only 39% of the estimates. Sodium interference is thought to be a major contributor to error in estimating (Ca2+) using the colorimetric method. Key words: Calcium ion activity, methods comparison, aqueous species distribution, selective ion electrode, tetramethylmurexide

Measurement of Calcite Ion Activity Products in Soils

1990 ◽  
Vol 54 (1) ◽  
pp. 67-71 ◽  
Author(s):  
K. J. Reddy ◽  
W. L. Lindsay ◽  
S. M. Workman ◽  
J. I. Drever
Keyword(s):  
Ion Activity ◽  
Ion Activity Products
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