Determination of Boron Content in Hydrothermal Vapor by Ion Selective Electrode Method: Insights into the Gaseous Transport of Boron

Sheng ZHANG; Gen-wen CHEN; T M SEWARD

doi:10.15898/j.cnki.11-2131/td.2016.04.004

2016 Vol. 35, No. 4

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Article navigation > Rock and Mineral Analysis > 2016 > 35(4): 358-365

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Sheng ZHANG, Gen-wen CHEN, T M SEWARD. Determination of Boron Content in Hydrothermal Vapor by Ion Selective Electrode Method: Insights into the Gaseous Transport of Boron[J]. Rock and Mineral Analysis, 2016, 35(4): 358-365. doi: 10.15898/j.cnki.11-2131/td.2016.04.004

Citation:

Sheng ZHANG, Gen-wen CHEN, T M SEWARD. Determination of Boron Content in Hydrothermal Vapor by Ion Selective Electrode Method: Insights into the Gaseous Transport of Boron[J]. Rock and Mineral Analysis, 2016, 35(4): 358-365. doi: 10.15898/j.cnki.11-2131/td.2016.04.004

Determination of Boron Content in Hydrothermal Vapor by Ion Selective Electrode Method: Insights into the Gaseous Transport of Boron

1.
Key Laboratory for Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington 600, New Zealand

Received Date: 21 June 2016

Revised Date: 03 July 2016

Accepted Date: 15 July 2016

Abstract

Abstract

Geological phenomena of volcanism and metallogenesis indicate that boron can be transported significantly in aqueous fluids and gases. In this study, the Ion Selective Electrode Method was used to determine the solubility of boron in hydrothermal vapor in order to determine the ability of gaseous transport of boron. The electric potentials of boric acid standard solutions and boron-bearing condensates of water vapor after conversion to tetrafluoroborate ion with hydrofluoric acid were determined using a fluoroborate selective electrode. When the concentrations of boron change within the main range of geological fluids (0.52-524.50 mg/L), the calibration curve reveals a good linear Nernstian relationship between the potential and the logarithm of boron content with high sensitivity, good stability and good reproducibility. The detection limit of this method is 0.13 mg/L of boron, within uncertainties, which is lower than the upper limit of boron content standard for potable waters. This method is suitable for boron analysis of hydrothermal vapor. The experimental results of boric acid volatilization show that boron content in water vapor reaches 0.65%-0.72% at 150℃ and 0.37 MPa, which is consistent with boron-rich volcanic fumarole gases, demonstrating that boron can be remarkably transported in vapor phase and exists mainly in gaseous molecule species H₃BO₃ under high-temperature hydrothermal conditions. The geological characteristics of ore deposits and available experimental evidence indicate that boron transport in vapor and subsequent tourmalinization is closely related to the mineralization of rare metal type pegmatites and the formation of hydrothermal-pneumatolytic type Sn-W and Mo deposits and porphyry Cu and Au deposits.
- hydrothermal vapor /
- gaseous transport /
- boron /
- Ion Selective Electrode Method

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