Preparation and Measurement of Cassiterite for Sn Isotope Analysis

Ryan Dilip Mathur, Wayne Powell, Andrea Mason, Linda Godfrey, Junming Yao, Mark E. Baker

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Increased interest in the fractionation of Sn isotopes has led to the development of several techniques for preparing cassiterite (SnO2, the primary ore of Sn) for isotopic analysis. Two distinct methods have been applied in recent isotopic studies of cassiterite: (a) reduction to tin metal with potassium cyanide (KCN) at high temperature (800 °C), with subsequent dissolution in HCl, and (b) reduction to a Sn solution with hydriodic acid (HI) at low temperature (100 °C). This study compares the effectiveness and accuracy of these two methods and contributes additional methodological details. The KCN method consistently yielded more Sn (> 70% in comparison with < 5%), does not appear to fractionate Sn isotopes at high temperatures over a 2-hour period and produced consistent Sn isotope values at flux mass ratios of ≥ 4:1 (flux to mineral) with a minimum reduction time of 40 min. By means of a distillation experiment, it was demonstrated that HI could volatilise Sn, explaining the consistently low yields by this method. Furthermore, the distillation generated Sn vapour, which is up to 0.38‰ per mass unit different from the starting material, the largest induced Sn fractionation reported to date. Accordingly, the HI method is not recommended for cassiterite preparation for Sn isotopic analysis.

Original languageEnglish (US)
Pages (from-to)701-707
Number of pages7
JournalGeostandards and Geoanalytical Research
Volume41
Issue number4
DOIs
StatePublished - Dec 1 2017

Fingerprint

cassiterite
Isotopes
isotope
Fractionation
Distillation
Potassium Cyanide
isotopic analysis
distillation
Tin
acid
Temperature
fractionation
Ores
Minerals
Dissolution
Mass transfer
Metals
Vapors
Fluxes
lead isotope

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

Cite this

Mathur, R. D., Powell, W., Mason, A., Godfrey, L., Yao, J., & Baker, M. E. (2017). Preparation and Measurement of Cassiterite for Sn Isotope Analysis. Geostandards and Geoanalytical Research, 41(4), 701-707. https://doi.org/10.1111/ggr.12174
Mathur, Ryan Dilip ; Powell, Wayne ; Mason, Andrea ; Godfrey, Linda ; Yao, Junming ; Baker, Mark E. / Preparation and Measurement of Cassiterite for Sn Isotope Analysis. In: Geostandards and Geoanalytical Research. 2017 ; Vol. 41, No. 4. pp. 701-707.
@article{178a4de6e79643649b5aa1b4f658309a,
title = "Preparation and Measurement of Cassiterite for Sn Isotope Analysis",
abstract = "Increased interest in the fractionation of Sn isotopes has led to the development of several techniques for preparing cassiterite (SnO2, the primary ore of Sn) for isotopic analysis. Two distinct methods have been applied in recent isotopic studies of cassiterite: (a) reduction to tin metal with potassium cyanide (KCN) at high temperature (800 °C), with subsequent dissolution in HCl, and (b) reduction to a Sn solution with hydriodic acid (HI) at low temperature (100 °C). This study compares the effectiveness and accuracy of these two methods and contributes additional methodological details. The KCN method consistently yielded more Sn (> 70{\%} in comparison with < 5{\%}), does not appear to fractionate Sn isotopes at high temperatures over a 2-hour period and produced consistent Sn isotope values at flux mass ratios of ≥ 4:1 (flux to mineral) with a minimum reduction time of 40 min. By means of a distillation experiment, it was demonstrated that HI could volatilise Sn, explaining the consistently low yields by this method. Furthermore, the distillation generated Sn vapour, which is up to 0.38‰ per mass unit different from the starting material, the largest induced Sn fractionation reported to date. Accordingly, the HI method is not recommended for cassiterite preparation for Sn isotopic analysis.",
author = "Mathur, {Ryan Dilip} and Wayne Powell and Andrea Mason and Linda Godfrey and Junming Yao and Baker, {Mark E.}",
year = "2017",
month = "12",
day = "1",
doi = "10.1111/ggr.12174",
language = "English (US)",
volume = "41",
pages = "701--707",
journal = "Geostandards and Geoanalytical Research",
issn = "1639-4488",
publisher = "Wiley-Blackwell",
number = "4",

}

Mathur, RD, Powell, W, Mason, A, Godfrey, L, Yao, J & Baker, ME 2017, 'Preparation and Measurement of Cassiterite for Sn Isotope Analysis', Geostandards and Geoanalytical Research, vol. 41, no. 4, pp. 701-707. https://doi.org/10.1111/ggr.12174

Preparation and Measurement of Cassiterite for Sn Isotope Analysis. / Mathur, Ryan Dilip; Powell, Wayne; Mason, Andrea; Godfrey, Linda; Yao, Junming; Baker, Mark E.

In: Geostandards and Geoanalytical Research, Vol. 41, No. 4, 01.12.2017, p. 701-707.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Preparation and Measurement of Cassiterite for Sn Isotope Analysis

AU - Mathur, Ryan Dilip

AU - Powell, Wayne

AU - Mason, Andrea

AU - Godfrey, Linda

AU - Yao, Junming

AU - Baker, Mark E.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Increased interest in the fractionation of Sn isotopes has led to the development of several techniques for preparing cassiterite (SnO2, the primary ore of Sn) for isotopic analysis. Two distinct methods have been applied in recent isotopic studies of cassiterite: (a) reduction to tin metal with potassium cyanide (KCN) at high temperature (800 °C), with subsequent dissolution in HCl, and (b) reduction to a Sn solution with hydriodic acid (HI) at low temperature (100 °C). This study compares the effectiveness and accuracy of these two methods and contributes additional methodological details. The KCN method consistently yielded more Sn (> 70% in comparison with < 5%), does not appear to fractionate Sn isotopes at high temperatures over a 2-hour period and produced consistent Sn isotope values at flux mass ratios of ≥ 4:1 (flux to mineral) with a minimum reduction time of 40 min. By means of a distillation experiment, it was demonstrated that HI could volatilise Sn, explaining the consistently low yields by this method. Furthermore, the distillation generated Sn vapour, which is up to 0.38‰ per mass unit different from the starting material, the largest induced Sn fractionation reported to date. Accordingly, the HI method is not recommended for cassiterite preparation for Sn isotopic analysis.

AB - Increased interest in the fractionation of Sn isotopes has led to the development of several techniques for preparing cassiterite (SnO2, the primary ore of Sn) for isotopic analysis. Two distinct methods have been applied in recent isotopic studies of cassiterite: (a) reduction to tin metal with potassium cyanide (KCN) at high temperature (800 °C), with subsequent dissolution in HCl, and (b) reduction to a Sn solution with hydriodic acid (HI) at low temperature (100 °C). This study compares the effectiveness and accuracy of these two methods and contributes additional methodological details. The KCN method consistently yielded more Sn (> 70% in comparison with < 5%), does not appear to fractionate Sn isotopes at high temperatures over a 2-hour period and produced consistent Sn isotope values at flux mass ratios of ≥ 4:1 (flux to mineral) with a minimum reduction time of 40 min. By means of a distillation experiment, it was demonstrated that HI could volatilise Sn, explaining the consistently low yields by this method. Furthermore, the distillation generated Sn vapour, which is up to 0.38‰ per mass unit different from the starting material, the largest induced Sn fractionation reported to date. Accordingly, the HI method is not recommended for cassiterite preparation for Sn isotopic analysis.

UR - http://www.scopus.com/inward/record.url?scp=85020230615&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020230615&partnerID=8YFLogxK

U2 - 10.1111/ggr.12174

DO - 10.1111/ggr.12174

M3 - Article

VL - 41

SP - 701

EP - 707

JO - Geostandards and Geoanalytical Research

JF - Geostandards and Geoanalytical Research

SN - 1639-4488

IS - 4

ER -