Calculation of the amount of specifically adsorbed ions. Application to potassium iodide in the 10−2–10−3 M range

Delahay, Paul; Kelsh, D.J.

doi:10.1016/s0022-0728(68)80176-7

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…Of course, congruence applies likewise to the integrated form of the Experimentally, ionic adsorption isotherms are usually noncongruent. There is one apparent exception, that of I-, which is congruent over the entire range studied by Grahame (91), although noncongruence shows up even here when the measurements are extended to lower concentrations (92). A typical example of a noncongruent ionic adsorption isotherm is that of chloride (93).…”

Section: Am (Fjax)~'mentioning

confidence: 69%

Anion Bridging and Anion Electrocatalysis on Mercury

Levie

1971

J. Electrochem. Soc.

158

104

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The rate‐enhancing effect of some specifically adsorbed anions on the kinetics of several electrode reactions greatly exceeds that predicted by the Frumkin correction. The literature on this effect is critically reviewed, including Heyrovsky's 1947 hypothesis of ligand bridging and the pioneering work of Aikens and Ross on the oxidation of Cr(II). Two current theoretical interpretations are discussed and several related comments are made regarding ionic adsorption.

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Section: Am (Fjax)~'mentioning

confidence: 69%

Anion Bridging and Anion Electrocatalysis on Mercury

Levie

1971

J. Electrochem. Soc.

158

104

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“…Soil exchangeable K (EK) was calculated by subtracting WSK from AK. According to previous research [27,32], soil non-specific adsorptive K (NSAK) was extracted using 0.5 mol�L -1 magnesium acetate and calculated by subtracting WSK from the K extracted using 0.5 mol�L -1 magnesium acetate. Subsequently, soil specific adsorptive K (SAK) was calculated by subtracting both WSK and NSAK from AK.…”

Section: Sampling and Analysesmentioning

confidence: 99%

“…According to previous studies, soil EK can be further separated into non-specific adsorptive K (NSAK) and specific adsorptive K (SAK). Soil SAK is adsorbed around the edges and wedge zones of micaceous clay minerals and is more intensively held by soil minerals, with relatively lower mobility as compared with NSAK [27,32]; however, dynamic equilibrium reactions of soil K exist among different fractions [2,33]. For example, soil AK can be fixed as NEK, which reduces its bioavailability for the current crop since soil K + ions in soluble or adsorbed forms enter the adsorption sites in mineral matrixes of 2:1 type clay [2,27,31].…”

Section: Introductionmentioning

confidence: 99%

Potassium fertilization combined with crop straw incorporation alters soil potassium fractions and availability in northwest China: An incubation study

et al. 2020

PLoS ONE

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Potassium (K) input is essential for the improvement of soil fertility in agricultural systems. However, organic amendment may differ from mineral K fertilization with respect to modifying the soil K transformation among different fractions, affecting soil K availability. We conducted a 60-day lab incubation experiment to evaluate the response of soil K dynamics and availability in various fractions with a view to simulating crop residue return and chemical K fertilization in an Anthrosol of northwest China. The tested soil was divided into two main groups, no K fertilization (K0) and K fertilization (K1), each of which was subjected to four straw addition regimes: no straw addition (Control), wheat straw addition (WS), maize straw addition (MS), and both wheat straw and maize straw addition (WS+MS). Soil K levels in the available (AK) and non-exchangeable (NEK) fractions were both significantly increased after K addition, following the order of K>WS>MS. Fertilizer K was the most efficient K source, demonstrating a 72.9% efficiency in increasing soil AK, while wheat and maize straw exhibited efficiencies of 47.1% and 39.3%, respectively. Furthermore, K fertilization and wheat and maize straw addition increased the soil AK in a cumulative manner when used in combination. The mobility factor (M F) and reduced partition index (I R) of soil K were used to quantitate the comprehensive soil K mobility and stability, respectively. Positive relationships were observed between the M F and all relatively available fractions of soil K, whereas the I R value of soil K correlated negatively with both M F and all available fractions of soil K. In conclusion, straw amendment could be inferior to mineral K fertilization in improving soil K availability when they were almost equal in the net K input. Crop straw return coupled with K fertilization can be a promising strategy for improving both soil K availability and cycling in soil-plant systems.

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