Determination of Oxygen Isotopic Composition in Barium Sulfate by Online Pyrolysis Method with Nickel-plated Carbon as Reductant

Gui-shan JIN; Han-bin LIU; Juan HAN; Jun-jie LI; Jian-feng ZHANG; Jia ZHANG; Xiao SHI

doi:10.15898/j.cnki.11-2131/td.201809090103

Rock and Mineral Analysis > 2019 > 38(4): 365-372. > DOI: 10.15898/j.cnki.11-2131/td.201809090103

Gui-shan JIN, Han-bin LIU, Juan HAN, Jun-jie LI, Jian-feng ZHANG, Jia ZHANG, Xiao SHI. Determination of Oxygen Isotopic Composition in Barium Sulfate by Online Pyrolysis Method with Nickel-plated Carbon as Reductant[J]. Rock and Mineral Analysis, 2019, 38(4): 365-372. DOI: 10.15898/j.cnki.11-2131/td.201809090103

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Determination of Oxygen Isotopic Composition in Barium Sulfate by Online Pyrolysis Method with Nickel-plated Carbon as Reductant

Beijing Research Institute of Uranium Geology, Beijing 100029, China

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Received Date: September 08, 2018
Revised Date: March 10, 2019
Accepted Date: April 08, 2018
Published Date: June 30, 2019

Abstract

HIGHLIGHTS
(1) Barium sulfate was selected for the oxygen isotopic composition analysis of sulfate radical in order to reduce the interference of oxygen isotope.

(2) Ni-C was added to reduce the reaction temperature during online measurement of oxygen isotope composition of barium sulfate.

(3) The accuracy of oxygen isotope composition in barium sulfate by EA-IRMS was related to background, reaction temperature, sample size ratio between Ni-C and BaSO₄, and sample amount of BaSO₄.

ABSTRACT

BACKGROUNDThe oxygen isotopic composition of sulfate radical in mineral or water can be used to identify the source and transformation process. At present, the common method is to convert sulfate radical into barium sulfate and the oxygen isotopic composition determined offline or online. It is possible to shorten the working life of the furnace when δ¹⁸O of barium sulfate is measured online under 1420℃. The reaction temperature can be reduced by adding reductant carbon, but there is less discussion about the reaction temperature reported.
OBJECTIVESTo confirm the key technical parameters during determination of oxygen isotope composition in barium sulfate online.
METHODSNickel-plated carbon was added in a series of conditional experiments during determination of oxygen isotope composition of barium sulfate by elemental analysis/isotope ratio mass spectrometry (EA-IRMS).
RESULTS1350℃ was chosen as the online pyrolysis temperature of barium sulfate by adding Ni-C. The sample size ratio between Ni-C and BaSO₄ was set as 0.73-2.15. The sample weight of Ni-C and BaSO₄ was 700±100μg, respectively. Under the above conditions, the precision of δ¹⁸O of BaSO₄ measured by EA/HT-IRMS was ±0.12‰-±0.26‰, better than the reported results of ±0.20‰-±0.50‰.
CONCLUSIONSOn the premise of better precision, the online pyrolysis temperature of barium sulfate can be reduced to 1350℃ and the lifetime of the reactor can be improved by adding Ni-C.
- barium sulfate,
- elemental analysis-isotope ratio mass spectrometry,
- oxygen isotope,
- nickel-plated carbon,
- online pyrolysis method

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