Boron isotopic fractionation during seawater evaporation

Xiao, Yaonan; Li, S.Z.; Wei, Haizheng; Sun, Aide; Liu, W.G.; Zhou, Weijian; Zhao, Zhi‐Qi; Liu, C.Q.; Swihart, George H.

doi:10.1016/j.marchem.2006.10.007

Cited by 31 publications

(13 citation statements)

References 25 publications

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“…There are 189 pesticide products registered that contain boric acid or its B is specific to location, making anthropogenic boron isotopic ratios from a mined location distinctly different than that found in most groundwater and soil ratios (Davidson and Bassett 1993). This allows utilization of the boron isotopic ratio to determine potential contamination in groundwater (Vengosh et al 1994), river water (Chetelat and Gaillardet 2005), marine water (Xiao et al 2007), and effluent (Kloppmann et al 2008). Boron is the 51 st most common element found in the earth's crust and is found in an average concentration of 8 mg/kg (approximately 0.0008%) (Cotton et al 1999;Jansen 2003).…”

Section: Usementioning

confidence: 99%

“…B is specific to location, making anthropogenic boron isotopic ratios distinctly different than groundwater (Davidson and Bassett 1993). This allows utilization of the boron isotopic ratio to determine potential contamination in groundwater (Vengosh et al 1994), river water (Chetelat and Gaillardet 2005), marine water (Xiao et al 2007), and effluent (Kloppmann et al 2008). …”

Section: Environmental Samplesmentioning

confidence: 99%

See 1 more Smart Citation

Medical image of the week: acute pneumonitis secondary to boric acid exposure

Ateeli¹,

Zaid²,

Chaudhary³

2018

Southwest J Pulm Crit Care

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Section: Usementioning

confidence: 99%

Section: Environmental Samplesmentioning

confidence: 99%

Medical image of the week: acute pneumonitis secondary to boric acid exposure

Ateeli¹,

Zaid²,

Chaudhary³

2018

Southwest J Pulm Crit Care

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“…This process would have been associated with the evaporation of brine and the precipitation of soluble minerals within the previous lake. It is known that the δ 11 B values of water are expected to increase during processes such as the evaporation of seawater (Vengosh et al, 1992;Xiao et al, 1992Xiao et al, , 2007, the adsorption of boron onto clay minerals (Palmer et al, 1987) and the precipitation of boron into soluble minerals (Xiao et al, 1992(Xiao et al, , 1999Vengosh et al, 1995). Therefore, the δ 11 B values of the sources should be lower than those of the salt lake (Xiao et al, 1992).…”

Section: Dmentioning

confidence: 99%

Origin of boron in the Damxung Co Salt Lake (central Tibet): Evidence from boron geochemistry and isotopes

et al. 2013

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The origin of boron in boron-rich salt lakes in the Tibetan Plateau has long been the subject of debate. The Damzung Co Salt Lake in central Tibet has high boron concentrations (B = 276-313 mg/L) and is an ideal site for investigation. The aim of this study is to analyze the boron geochemistry and isotope composition of surface brine, source water, country rock, and Quaternary deposits (carbonate clay, stromatolite, and travertine) in the lake, to understand the unusual boron enrichment of the salt lakes in Tibet. Concentrations of boron in stream water samples from the basin are low (B = 0.172-2.08 mg/L), with the exception of one sample that has an input of geothermal water (B = up to 13.6 mg/L). Their variable boron isotope compositions represent the characteristics of country rock weathering input (δ 11 B = -8.6 to -0.5‰). Hot springs have much higher boron concentrations (B = 3.31-49.4 mg/L) than streams and cold springs (B = 0.434-4.82 mg/ L). Boron isotope data show that the δ 11 B values of streams, hot springs (-9.8 to -8.5‰), and cold springs (-14.5 to -1.2‰) are much higher than those of the salt lake (-18.5 to -17.4‰), except in samples containing Quaternary deposits. This finding, therefore, rules out the possibility that the present boron deposits originate from country rock weathering or hot springs, as historically proposed by Chinese scientists. The slight variability in boron isotopic composition in the present lake indicates only one major boron source. Three samples containing Quaternary deposits have different boron isotopic compositions with -37.2 to -35.3‰ (carbonate clay), -29.5 to -24.9‰ (travertine), and -28.2 to -26.7‰ (stromatolite). The fractionation factor between carbonate clay and the lake are very similar to that between seawater, sediment and carbonate in a similar pH range, compared with stromatolite and travertine. Hence, we conclude that early carbonate clay deposits within the lake basin are the present main source of boron in the Damxung Co Salt Lake.

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“…Boron was removed from seawater by low-temperature alteration of the oceanic crust [13,66], the adsorption of boron on clay-rich sediments [13], and coprecipitation in biogenic carbonates [57]. Furthermore, seawater evaporation experiments [67] indicate the enrichment of 11 B in the vapor. The implications for the natural environment are that rainfall with lower 11 B values than that of seawater caused continental boron sources or the air mass to be partially depleted of 11 B by previous condensation events.…”

Section: Boron Isotopic Composition Of Paleozoic Oceansmentioning

confidence: 99%

Boron isotopic composition of Paleozoic brachiopod and coeval coral calcites in Yunnan-Guizhou Plateau, China

Xiao

et al. 2011

Sci. China Earth Sci.

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Boron isotope values in Paleozoic brachiopods and corals, collected from the Yunnan-Guizhou Plateau, China, can be used to constrain the boron isotope compositions of past oceans. All brachiopod shells and coral samples were screened for diagenetic recrystallization by cathodoluminescence microscopy, trace element geochemistry of B, Fe, Mn, Sr, and scanning electron microscopy. The boron isotope ratios for brachiopods in Silurian, Devonian, Carboniferous, and Triassic calcites are in the ranges 8.9‰-14.0‰, 8.8‰-13.8‰, 10.3‰-16.3‰, and 6.7‰-12.4‰, respectively. The boron isotope ratios of coral calcites in the Silurian, Devonian, and Permian are 9.1‰-12.2‰, 6.1‰-13.8‰, and 9.2‰-16.1‰, respectively. The δ 11 B values for both brachiopods and corals are significantly lower than those for modern biogenic carbonates, indicating that the Paleozoic oceans were depleted of δ 11 B by up to 10‰. Our results are consistent with previous published studies. The boron isotope compositions of corals and brachiopods show the consistent trends. The low δ 11 B values may be explained by an enhanced riverine flux of boron from the continents. boron isotope, coral, brachiopod, Paleozoic Citation: Ma Y Q, Xiao Y K, He M Y, et al. Boron isotopic composition of Paleozoic brachiopod and coeval coral calcites in Yunnan-Marine carbonate chemistry and atmospheric concentrations of the greenhouse gas CO 2 are tightly coupled, so the reconstruction of atmospheric PCO 2 from marine carbonate minerals is an important goal for paleoclimatology. One of the most promising carbonate chemistry proxies for the marine environment is the boron isotopic composition ( 11 B) of biogenic calcium carbonate, which is an established tracer for paleo-pH [1][2][3][4][5]. Boron dissolved in seawater occurs as B(OH) 4 -and B(OH) 3 , and the relative proportion of these species is determined by the pH of the ambient seawater. The boron isotopic composition of the two species exhibits a significant fractionation, with B(OH) 4 -depleted in 11 B by ~19‰ with respect to B(OH) 3 (=1.0194) [6]. More recent studies suggest a larger fractionation factor both on the basis of theoretical considerations (=1.027) [7] and in direct measurements (=1.0272) [8]. If seawater pH changes, the relative proportion of the two species and the isotopic compositions of B(OH) 4 -and B(OH) 3 also change. Because it has been generally assumed that the charged species B(OH) 4 -is incorporated into carbonate minerals without any significant boron isotopic fractionation [1, 4], the  11 B of biogenic carbonates has been used as a paleo-pH proxy [2, 5,

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Boron isotopic fractionation during seawater evaporation

Cited by 31 publications

References 25 publications

Medical image of the week: acute pneumonitis secondary to boric acid exposure

Medical image of the week: acute pneumonitis secondary to boric acid exposure

Origin of boron in the Damxung Co Salt Lake (central Tibet): Evidence from boron geochemistry and isotopes

Boron isotopic composition of Paleozoic brachiopod and coeval coral calcites in Yunnan-Guizhou Plateau, China

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