Study on Influence Factors for Determination of Oxygen Isotopic Composition of Silicates and Oxide Minerals by BrF<sub>5</sub> Method

Jian-feng ZHANG; Han-bin LIU; Xiao SHI; Gui-shan JIN; Jun-jie LI; Jia ZHANG; Juan HAN; Dong-qiao GUO; Fang-wen ZHONG

doi:10.15898/j.cnki.11-2131/td.201805170062

Rock and Mineral Analysis > 2019 > 38(1): 45-54. > DOI: 10.15898/j.cnki.11-2131/td.201805170062

Jian-feng ZHANG, Han-bin LIU, Xiao SHI, Gui-shan JIN, Jun-jie LI, Jia ZHANG, Juan HAN, Dong-qiao GUO, Fang-wen ZHONG. Study on Influence Factors for Determination of Oxygen Isotopic Composition of Silicates and Oxide Minerals by BrF₅ Method[J]. Rock and Mineral Analysis, 2019, 38(1): 45-54. DOI: 10.15898/j.cnki.11-2131/td.201805170062

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Study on Influence Factors for Determination of Oxygen Isotopic Composition of Silicates and Oxide Minerals by BrF₅ Method

Beijing Research Institute of Uranium Geology, Beijing 100029, China

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Received Date: May 16, 2018
Revised Date: August 06, 2018
Accepted Date: August 09, 2018
Published Date: December 31, 2018

Abstract

HIGHLIGHTS
(1) Influence factors for determination of oxygen isotopic composition of silicates and oxide minerals by BrF₅ method were studied.

(2) 650-750℃ is the best calcination temperature range for removing carbon components during oxygen isotope analysis.

(3) Shortening the sample loading time can reduce the effect of environmental humidity on oxygen isotope analysis.

ABSTRACT

BACKGROUNDReagent purification, sample pretreatment, environmental humidity, reactor cleanliness and experimental quality control are the main influence factors for determination of oxygen isotopic composition of silicates and oxide minerals by BrF₅ method.
OBJECTIVESTo determine the optimal experimental conditions and improve the accuracy by selecting silicates and oxide minerals as laboratory raw materials for oxygen isotopic composition analysis. To discuss the influence factors for determination of oxygen isotopic composition of silicates and oxide minerals by BrF₅ method.
METHODSUsing BrF₅ analysis method and taking standard sample as the reference, oxygen isotopic compositions of silicates and oxide minerals were determined at different calcination temperatures. At the same time, the effects of environmental humidity and reactor cleanliness on the analytical results were also studied.
RESULTSThe results show that 650-750℃ is the best calcination temperature range for removing carbon components during oxygen isotope analysis, which can avoid the isotope fractionation caused by temperature. By reducing the relative environment humidity or the sample loading time within 0.5min, the lower δ¹⁸O values caused by vapor was improved. The new reactor, or the reactor with large yellow substance falling off, or the contaminated reactor will reduce the yield of oxygen and cause oxygen isotope fractionation, so the reactors should be fluorinated or purged in time. The sample and standard material is loaded alternately for each reactor to monitor the reliability of the isotopic composition of the sample. The results of oxygen isotopic composition of GBW04409 are consistent with the recommended values. The relative standard deviation is better than 0.1‰ for δ¹⁸O under the optimized conditions.
CONCLUSIONSThe proposed method can effectively control oxygen isotope fractionation and improve the applicability of BrF₅ oxygen isotope analysis method.
- oxygen isotope,
- silicates and oxide minerals,
- BrF₅ method,
- calcination temperature,
- relative humidity

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