Chapter 6 Common Solubility Equilibria in Soils

Novozámský, I.; Beek, J.

doi:10.1016/s0166-2481(08)70635-4

Cited by 14 publications

(7 citation statements)

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“…The activity of was computed using the following equation based on the dissociation of carbonic acid and water, and the solubility constant for CO 2 in water (Novozamsky and Beek 1976):…”

Section: Methodsmentioning

confidence: 99%

Cadmium uptake by garland chrysanthemum can be predicted from the cadmium in the soil solution, independent of soil type

Kamewada

Nakayama

2009

Soil Science and Plant Nutrition

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We conducted a pot trial to investigate the effects of soil cadmium (Cd) content, soil pH, soil type and soil chloride (Cl -) content on Cd uptake by garland chrysanthemum (Chrysanthemum coronarium cv. Kiwame-Cyuba) to improve predictions of plant Cd uptake. We concluded that predictions of plant Cd uptake should involve the following two procedures: (i) predicting the Cd concentration of the soil solution as a function of the chemical properties of the soil, (ii) predicting plant Cd uptake as a function of the Cd concentration in the soil solution. A unique hyperbolic relationship was observed between plant Cd uptake and total Cd concentration in the soil solution. The relationship was independent of soil type, soil Cd content and salinity treatment, and was explained by:where U Cd represents plant Cd uptake, [Cd T ] represents the total Cd concentration of the soil solution, and V p , V max and K m are constants. The Cd adsorption kinetics were investigated using the "monodentate coordination model," which enabled Cd 2+ activity in the soil solution to be explained by: log(Cd 2+ ) = log K mon + log Q Cd -pHlog C Cd , where K mon represents the equilibrium constant of Cd adsorption, (Cd 2+ ) represents Cd 2+ activity, Q cd represents the amount of Cd adsorbed, and C Cd represents the Cd adsorption capacity. The total Cd concentration in the soil solution showed a linear correlation with the Clconcentration in the soil solution. The effect of Clsalinity on the total Cd concentration in the soil solution was attributed to the formation of a cadmium-chloride complex (CdCl + ). For a more robust prediction of plant Cd uptake, there is a clear need for a simple method that can simultaneously determine the soil Cd concentration, the coefficient constant for Cd adsorption and the Cd adsorption capacity of the soil.

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“…The activity of was computed using the following equation based on the dissociation of carbonic acid and water, and the solubility constant for CO 2 in water (Novozamsky and Beek 1976):…”

Section: Methodsmentioning

confidence: 99%

Cadmium uptake by garland chrysanthemum can be predicted from the cadmium in the soil solution, independent of soil type

Kamewada

Nakayama

2009

Soil Science and Plant Nutrition

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“…Therefore, DOC was taken into account as an important soil characteristic. Probably, Ca concentration in pore water is controlled by the solubility of one of the Ca precipitates (calcite, aragonite, or dolomite) [35], which are highly dependent on pH. The ionic strength of the pore-water samples was calculated based upon the EC measured in the pore water according to the formula [34] I ϭ 0.013·EC (2) Based on PCA, Figure 2 shows the loadings of the soil characteristics for the first two principal components.…”

Section: Relations Between Solid-phase and Pore-water Characteristicsmentioning

confidence: 99%

Equilibrium Partitioning of Heavy Metals in Dutch Field Soils. I. Relationship Between Metal Partition Coefficients and Soil Characteristics

Janssen

Peijnenburg

Posthuma

et al. 1997

Environ Toxicol Chem

119

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Twenty Dutch soils were sampled at sites that were expected to have elevated levels of heavy metals compared to background values. Field‐based partition coefficients (Kp) for As, Cd, Cr, Cu, Ni, Pb, and Zn were determined by calculating the ratio of the amount of metal extracted by concentrated HNO3 to the metal concentration in the pore water. Kp values varied widely with metal and soil type and correlated well with soil pH. To a lesser extent amorphous Fe‐content and dissolved organic carbon (DOC) also explained part of the variation in Kp values. Thereupon, regression equations based on easily obtainable soil characteristics were derived. External validation of the regression equations showed that predicted log Kp values were in agreement with measured values.

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“…Numerous studies have reported that raising pH (e.g. through lime application) reduced plant Cd adsorption (McBride 2002;Novozamsky and Beek 1976;Hattori et al 2006;Filius et al 1998 …”

Section: How the Prediction Expression Workmentioning

confidence: 99%

A widely applicable model for predicting the cadmium concentration in soil solution

Kamewada

Nakayama

2011

Soil Science and Plant Nutrition

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We developed a method for predicting the total cadmium (Cd) concentration [Cd T . From this, we derived the balance equationWe calculated (CdCl þ ) as the product of (Cd 2þ ), chloride activity (Cl -), and a production constant. Our proposed prediction model wasWe conducted an experiment using six types of soil and manipulated the Cd content, pH, and chloride concentration [Cl À ] to determine the effect on Cd concentration in the soil solution. The soil solution measurements produced rectilinear regression relationships between log(Cd 2þ ) and log Q Cd -0.6pH with slopes of 1.0 in all soil types, which validated the proposed Cd adsorption-desorption stoichiometry; the y-intercept of the regression lines represented log(K Cd /C Cd ) and depended on the soil type. Furthermore, we were able to predict log(K Cd /C Cd ) as a function of cation exchange capacity (CEC), and the activity coefficient

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Chapter 6 Common Solubility Equilibria in Soils

Cited by 14 publications

References 1 publication

Cadmium uptake by garland chrysanthemum can be predicted from the cadmium in the soil solution, independent of soil type

Cadmium uptake by garland chrysanthemum can be predicted from the cadmium in the soil solution, independent of soil type

Equilibrium Partitioning of Heavy Metals in Dutch Field Soils. I. Relationship Between Metal Partition Coefficients and Soil Characteristics

A widely applicable model for predicting the cadmium concentration in soil solution

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