Coprecipitation of borate-boron with calcium carbonate.

Kitano, Yasushi; Okumura, Minoru; Idogaki, Masatoshi

doi:10.2343/geochemj.12.183

Cited by 70 publications

(46 citation statements)

References 15 publications

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“…The same phenomenon was observed during the coprecipitation of boron compounds with calcium carbonate. The coprecipitation of boron in calcite and aragonite was originally studied by Kitano et al [15], who reported a very low uptake of boron for calcite precipitated from near-neutral solutions. On the contrary, Hemming et al [16], working at higher pH values, obtained a boron uptake of almost two orders of magnitude higher than the results of Kitano et al [15].…”

Section: Discussionmentioning

confidence: 99%

“…The coprecipitation of boron in calcite and aragonite was originally studied by Kitano et al [15], who reported a very low uptake of boron for calcite precipitated from near-neutral solutions. On the contrary, Hemming et al [16], working at higher pH values, obtained a boron uptake of almost two orders of magnitude higher than the results of Kitano et al [15]. This discrepancy between the results of Kitano et al and Hemming et al was explained by Hobbs and Reardon [17], who clearly showed the influence of pH on the coprecipitation of boron; at higher pH values the coprecipitation of boron is substantially increased.…”

Section: Discussionmentioning

confidence: 99%

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Removal of boron from wastewater by precipitation of a sparingly soluble salt

et al. 2004

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Removal of boron from wastewater by precipitation of a sparingly soluble salt

et al. 2004

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“…In the previous reports (KITANO et al, 1978b), the influence of borate-boron on the crystal form of calcium carbonate was not clari fied, because of the low concentration of borate boron such as 50 mg/l in the parent solutions. Figure 1 shows the aragonite proportions (%) of carbonates formed from the calcium bicarbonate solutions (Ca2+, 380mg/1) containing 0.2g/l of magnesium ions and 0 to 300mg/1 of borate-boron, against percentage of calcium ions precipitated from the solutions and also against molar concentration ratio of magnesium ions to calcium ions in the parent solutions.…”

Section: Introductionmentioning

confidence: 99%

“…could not observe such an influence (KITANO et al, 1978b). The authors have studied the coprecipitation Then, the authors have reexamined the in of cations such as zinc, copper, magnesium, fluence of borate ions in a parent solution on strontium, barium and uranium ions and also of the crystal form of calcium carbonate formed anions such as chloride, fluoride, phosphate, from the solution.…”

Section: Introductionmentioning

confidence: 99%

“…The authors have studied the coprecipitation Then, the authors have reexamined the in of cations such as zinc, copper, magnesium, fluence of borate ions in a parent solution on strontium, barium and uranium ions and also of the crystal form of calcium carbonate formed anions such as chloride, fluoride, phosphate, from the solution. borate and sulfate ions (KITANO et al, 1968(KITANO et al, , 1975(KITANO et al, , 1976(KITANO et al, , 1978a(KITANO et al, , 1978bKITANO and EXPERIMENTAL PROCEDURE OOMORI, 1971;KITANO and OKUMURA, 1973). And they have reported the following interest Calcium bicarbonate solution was prepared ing observations: Copper, zinc and magnesium by bubbling calcium carbonate suspension with ions in a parent solution favor aragonite forma carbon dioxide gas.…”

Section: Introductionmentioning

confidence: 99%

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Influence of borate-boron on crystal form of calcium carbonate.

1979

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The influence of borate-boron on the crystal form of calcium carbonate has been studied ex perimentally.And it has been found that borate ions in a parent solution favor the formation of calcite. This experimental result is in good agreement with the prediction from the trend that chemical species which are more easily coprecipitated with calcite or aragonite favor the formation of aragonite or calcite respectively, because the authors reported previously that borate ions are more easily coprecipitated with aragonite than with calcite.

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Evaluating the utility of B/Ca ratios in planktic foraminifera as a proxy for the carbonate system: A case study of Globigerinoides ruber

Henehan

Foster

Rae

et al. 2015

Geochem Geophys Geosyst

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B/Ca ratios in foraminifera have attracted considerable scientific attention as a proxy for past ocean carbonate system. However, the carbonate system controls on B/Ca ratios are not straightforward, with D[CO DIC (as a simple model of boron speciation in seawater and incorporation into CaCO 3 would predict). Furthermore, culture experiments have shown that in planktic foraminifera properties such as salinity and [B] sw can have profound effects on B/Ca ratios beyond those predicted by simple partition coefficients. Here, we investigate the controls on B/Ca ratios in G. ruber via a combination of culture experiments and core-top measurements, and add to a growing body of evidence that suggests B/Ca ratios in symbiont-bearing foraminiferal carbonate are not a straightforward proxy for past seawater carbonate system conditions. We find that while B/ Ca ratios in culture experiments covary with pH, in open ocean sediments this relationship is not seen. In fact, our B/Ca data correlate best with [PO 32 4 ] (a previously undocumented association) and in most regions, salinity. These findings might suggest a precipitation rate or crystallographic control on boron incorporation into foraminiferal calcite. Regardless, our results underscore the need for caution when attempting to interpret B/Ca records in terms of the ocean carbonate system, at the very least in the case of mixed-layer planktic foraminifera.

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Coprecipitation of borate-boron with calcium carbonate.

Cited by 70 publications

References 15 publications

Removal of boron from wastewater by precipitation of a sparingly soluble salt

Removal of boron from wastewater by precipitation of a sparingly soluble salt

Influence of borate-boron on crystal form of calcium carbonate.

Evaluating the utility of B/Ca ratios in planktic foraminifera as a proxy for the carbonate system: A case study of Globigerinoides ruber

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