Boron isotopic fractionation related to boron sorption on humic acid and the structure of surface complexes formed

Lemarchand, Emmanuel; Schott, Jacques; Gaillardet, Jérôme

doi:10.1016/j.gca.2005.02.024

Cited by 121 publications

(88 citation statements)

References 49 publications

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“…On the other hand, B reactive adsorption sites on soil minerals can be blocked by organic components (Marzadori et al 1991;Gu and Lowe 1992). Lemarchand et al (2005) demonstrated that B adsorption on the purified humic acid was a rapid, pHdependant process which was significantly greater than that reported on clay minerals. The B adsorption curve was bell-shaped, and the maximum adsorption occurred at 9 \ pH \ 10.…”

Section: Surface Complexation Modelmentioning

confidence: 93%

“…Only one monoprotic carboxylic site was considered in MINTEQ. The deprotonation constant of the surface site (log K = -6.8) and the B complex formation constant (log K = 2.6) were as given in Lemarchand et al (2005).…”

Section: Chemical Surface Complexation Modelsmentioning

confidence: 99%

“…B adsorption modeling studies have been conducted with individual adsorbent materials such as aluminum and iron oxides/hydroxides, organic components, and goethite (Goldberg and Glaubig 1985;Toner and Sparks 1995;Goldberg 1999;Lemarchand et al 2005;Goli et al 2011). Although adsorption of B has been studied in numerous researches using empirical equations (Keren and Mezuman 1981;Elrashidi and O'Connor 1982;Goldberg and Forster 1991;Majidi et al 2010), B surface complexation modeling of soil constituent assemblages has less been investigated (Goldberg 1999;Goldberg et al 1993Goldberg et al , 2000Goldberg et al , 2004.…”

Section: Introductionmentioning

confidence: 99%

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Surface complexation model of boron adsorption by calcareous soils

Ranjbar

Jalali

2014

Int. J. Environ. Sci. Technol.

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This study aimed to evaluate boron (B) adsorption and the capacity of a surface complexation model for simulating this process in calcareous soils. Ten surface soils were collected from different land use areas in Hamedan, Western Iran, to characterize B sorption by soils. The mean B adsorbed by the sample soils varied from 8.9 to 32.8 %. Two empirical models including linear and Freundlich equations fitted well to the experimental data. The linear distribution (K d ) values varied from 1.32 to 6.86 L kg -1 , while the parameters of Freundlich equation including n and K Fr ranged from 1.16 to 1.33 and 3.31-16.81, respectively. The comparison of two empirical models indicated that B adsorption followed a nonlinear pattern. The soil organic matter had positive correlations with Freundlich and linear distribution coefficients. However, empirical models were not suitable for explaining the mechanism of B adsorption, so a surface complexation model was used to simulate and predict the B adsorption process. B adsorption modeling was conducted using Visual MINTEQ and PHREEQC, based on the assemblage of major surface components (hydrous ferric oxides, aluminum hydroxides, calcium carbonate, and humic acids). B adsorption was successfully modeled by surface complexation. The significant contribution of organic matter to B complexes was resulted from both experimental data and mechanistic modeling.

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Section: Surface Complexation Modelmentioning

confidence: 93%

Section: Chemical Surface Complexation Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface complexation model of boron adsorption by calcareous soils

Ranjbar

Jalali

2014

Int. J. Environ. Sci. Technol.

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“…We performed three total procedural replicates of SRM 951 (Table 3); the mean δ 11 B value of the three measurements was +0.2 ± 0.6 ‰.There results were within 2σ uncertainty to the certified SRM 951 value of 0 ‰, demonstrating that the chemical purification technique did not induce isotopic fractionation due to incomplete recovery of boron from the resin bed (Lemarchand et al, 2002b), and/or that sample dry-down steps did not induce boron isotopic fractionation (Gaillardet et al, 2001). …”

Section: Measurement Accuracy and Precisionmentioning

confidence: 82%

California GAMA Special Study: Stable isotopic composition of groundwater boron - analytical method development

Eppich¹,

Wimpenny²,

Yin³

et al. 2011

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“…The evolution pattern of boron incorporated into the Mg(OH) 2 , and the variations in partition coefficients with the pH, are basically the same as those of oxides and clay minerals. However, the maximum amounts of incorporated boron in brucite or other hydroxides are much higher than those of the oxides and clay minerals (Keren et al, 1981;Keren and Gast, 1983;Goldberg andGlaubig, 1985, 1986;Lemarchand et al, 2005Lemarchand et al, , 2007, indicating that the incorporation capacity of boron on hydroxides is stronger than that of both oxides and clay minerals. The boron concentration in corals varies from 39 to 117.5 ppm (Vengosh et al, 1991;Gaillardet and Allègre, 1995;Xiao et al, 2006b;Liu et al, 2009).…”

Section: The Partition Coefficient Of Boron Between Brucite and Finalmentioning

confidence: 96%

Boron isotope fractionation during brucite deposition from artificial seawater

2011

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Abstract. Experiments involving boron incorporation into brucite (Mg(OH) 2 ) from magnesium-free artificial seawater with pH values ranging from 9.5 to 13.0 were carried out to better understand the incorporation behavior of boron into brucite and the influence of it on Mg/Ca-SST proxy and δ 11 B-pH proxy. The results show that both the concentration of boron in deposited brucite ([B] d ) and its boron partition coefficient (K d ) between deposited brucite and final seawater are controlled by the pH of the solution. The incorporation capacity of boron into brucite is almost the same as that into corals, but much stronger than that into oxides and clay minerals. The isotopic compositions of boron in deposited brucite (δ 11 B d ) are higher than those in the associated artificial seawater (δ 11 B isw ) with fractionation factors ranging between 1.0177 and 1.0569, resulting from the preferential incorporation of B(OH) 3 into brucite. Both boron adsorptions onto brucite and the precipitation reaction of H 3 BO 3 with brucite exist during deposition of brucite from artificial seawater. The simultaneous occurrence of both processes determines the boron concentration and isotopic fractionation of brucite. The isotopic fractionation behaviors and mechanisms of boron incorporated into brucite are different from those into corals. The existence of brucite in corals can affect the δ 11 B and Mg/Ca in corals and influences the Mg/Ca-SST proxy and δ 11 B-pH proxy negatively. The relationship between δ 11 B and Mg/Ca in corals can be used to judge the existence of brucite in corals, which should provide a reliable method for better use of δ 11 B and Mg/Ca in corals to reconstruct paleo-marine environment.

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Boron isotopic fractionation related to boron sorption on humic acid and the structure of surface complexes formed

Cited by 121 publications

References 49 publications

Surface complexation model of boron adsorption by calcareous soils

Surface complexation model of boron adsorption by calcareous soils

California GAMA Special Study: Stable isotopic composition of groundwater boron - analytical method development

Boron isotope fractionation during brucite deposition from artificial seawater

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