Predicting the effect of the nature of diluents on extraction equilibria

Shmidt, V.S.; Rybakov, K.A.

doi:10.1007/bf01126346

Cited by 3 publications

(4 citation statements)

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“…25 Ion pair extraction systems have also demonstrated a relationship between the logarithm of the extraction coefficient and the free energy of hydration of anions. 26 The hydration energy of CrO 4 2is smaller than other anions, such as Cl -, Br -, SO 4 2-, HCO 3 -, and CO 3 2-, that are commonly found in groundwater. Low hydration energy (which generally decreases as the size of the anion increases) 23 favors the exchange of the anion associated with the SAM to the higher dielectric medium of the aqueous solution.…”

Section: Resultsmentioning

confidence: 95%

“…The influence of hydration on resin anion exchange was first discussed by Diamond and Whitley . Ion pair extraction systems have also demonstrated a relationship between the logarithm of the extraction coefficient and the free energy of hydration of anions . The hydration energy of CrO 4 2- is smaller than other anions, such as Cl - , Br - , SO 4 2- , HCO 3 - , and CO 3 2- , that are commonly found in groundwater.…”

Section: Resultsmentioning

confidence: 99%

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Ultrasensitive Detection of CrO₄²^- Using a Microcantilever Sensor

et al. 2001

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Microcantilevers modified with a self-assembled monolayer respond sensitively to specific ion concentrations. Here, we report the detection of trace amounts of CrO4(2-) using microcantilevers modified with a self-assembled monolayer of triethyl-12-mercaptododecylammonium bromide. The self-assembled monolayer was prepared on a silicon microcantilever coated with a thin layer of gold on one side. The microcantilever undergoes bending due to sorption of CrO4(2-) ions on the monolayer-modified side. It was found that a concentration of 10(-9) M CrO4(2-) can be detected using this technology in a flow cell. Other anions, such as Cl-, Br-, CO3(2-) (or HCO3-), and SO4(2-), have minimal effect on the deflection of this cantilever. The mechanics of the bending and the chemistry of cantilever modification are discussed.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Ultrasensitive Detection of CrO₄²^- Using a Microcantilever Sensor

et al. 2001

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“…It was already shown in the past that diluent has a substantial effect on the outcome of the extraction with respect to both distribution ratios as well as separation factors between different elements. [6][7][8][9][10][11][12][13][14][15] Despite the strong experimental evidence of diluent effect, its full theoretical explanation is challenging and predictions are still very uncertain. Few theoretical explanations for the diluent effect were proposed.…”

Section: Introductionmentioning

confidence: 99%

“…The first introduction of diluent effect to the predictions of distribution ratios in solvent extraction was proposed by Schmidt. 15 An empirical diluent parameter was included to predict the distribution ratios of zinc extracted by tri- n -octyl-amine in different diluents. Unfortunately, the proposed predictions were valid only for a limited number of diluents even with only one extracting agent.…”

Section: Introductionmentioning

confidence: 99%