Direct conversion of sulphide and sulphate minerals to SO2 for isotope analyses.

Ueda, Akira; Krouse, H. R.

doi:10.2343/geochemj.20.209

Cited by 98 publications

(41 citation statements)

References 12 publications

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“…The material was then combusted in a Heka EuroVector elemental analyser (HeKaTech, Wegberg, Germany) and analysed in a Thermo-Finnigan Delta V plus (Giesemann et al 1994;Kester et al 2001). The combustion takes place at 1,010°C and the resulting gases are reduced over hot copper (~800°C) to minimize the amount of SO 3 (Ueda and Krouse 1986). The gases are transported via a helium flow of~95 ml/min and separated on a GC column (Poropak 0.8 m at 84°C; see Yun et al 2005) and then channelled into the mass spectrometer via a ConFlo III.…”

Section: Methodsmentioning

confidence: 99%

Establishing collagen quality criteria for sulphur isotope analysis of archaeological bone collagen

Nehlich

Richards

2009

Archaeol Anthropol Sci

229

192

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Sulphur isotope measurements of bone collagen from archaeological sites are beginning to be applied more often, yet there are no clear criteria to assess the quality of the collagen and therefore the validity of the sulphur isotope values. We provide elemental data from different methods (DNA sequences, amino acid sequences and mass spectrometric measurements) which are used to establish a reliable system of quality criteria for sulphur isotope analyses of bone collagen. The difference in the amount of sulphur from fish and mammalian collagen type I led to the suggestion to use different criteria to assess the in vivo character of the collagen between these two categories. For establishing quality ranges, the bone collagen of 140 modern animals were analysed. The amount of sulphur in fish and mammalian bone collagen is 0.63±0.08% and 0.28 ±0.07%, respectively. Based on these results we define for mammalian bone collagen an atomic C:S ratio of 600±300 and an atomic N:S ratio of 200±100, and for fish bone an atomic C:S ratio of 175±50 and an atomic N:S ratio of 60± 20. These quality criteria were then applied to 305 specimens from different archaeological contexts.

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Section: Methodsmentioning

confidence: 99%

Establishing collagen quality criteria for sulphur isotope analysis of archaeological bone collagen

Nehlich

Richards

2009

Archaeol Anthropol Sci

229

192

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“…Sulphidic sulphur in the insoluble residuum was converted to sulphate using HNO 3 -HCl mixture (Jarchovský 1960), and precipitated as barium sulphate. The SO 2 gas for sulphur isotope analysis was produced by heating of BaSO 4 with a SiO 2 +V 2 O 5 mixture (Ueda & Krouse 1987) at 1050 °C. Results of isotope analyses are conventionally expressed in delta (δ) notation as per mil (‰) deviation from commonly used standards (PDB, SMOW, CDT).…”

Section: Methodsmentioning

confidence: 99%

Post-magmatic hydrothermal mineralization associated with Cretaceous picrite (Outer Western Carpathians, Czech Republic): interaction between host rock and externally derived fluid

Dolníček¹,

Urubek²,

Kropáč³

2010

Geologica Carpathica

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Mineralogy, fluid inclusions, C, O, S, Sr isotopes and trace elements have been studied in amygdule and vein mineralization hosted by the Lower Cretaceous effusive picrite at Hončova hůrka (Silesian Unit, Flysch Belt of the Outer Western Carpathians). Besides dominating dolomite, magnesite, siderite, quartz, calcite, chlorite, glauconite, fluorite, barite, pyrite and millerite were also identified. The parent fluids are characterized by low temperatures (< 50-170 °C), low salinities (0.4 to 3.7 wt. % NaCl eq.), low content of strong REE-complexing ligands, δ 18 O, δ 13 C and δ 34 S ranges of 0/+ 14 ‰ SMOW, 0/-9 ‰ PDB and ~0 ‰ CDT, respectively, and initial 87 Sr/ 86 Sr ratios much more radiogenic (0.7060 to 0.7068) than those of host picrite (0.7042 and 0.7046). The fluids are interpreted to be predominantly of external origin, derived from mixing of seawater with diagenetic waters produced by dewatering of clay minerals in the associated flysch sediments. The isotope and REE signatures indicate interaction of at least a part of fluids with sedimentary carbonates. The interaction of fluids with host picrite led to strong alteration of rock-forming minerals and leaching of some elements (Mg, Ni, S, partly also REE) that widely participated during precipitation of vein-and amygdule-hosted mineral phases.

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“…The samples were converted to BaSO4 and Age S, then to S02 by the method discussed in Ueda and Krouse (1986). The sulfur isotope ratios of sulfur dioxide were measured with use of a mass spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Thermochemical reduction and sulfur isotopic behavior of sulfate by acetic acid in the presence of native sulfur.

Kiyosu

Krouse

1993

Geochem. J.

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Direct conversion of sulphide and sulphate minerals to SO2 for isotope analyses.

Cited by 98 publications

References 12 publications

Establishing collagen quality criteria for sulphur isotope analysis of archaeological bone collagen

Establishing collagen quality criteria for sulphur isotope analysis of archaeological bone collagen

Post-magmatic hydrothermal mineralization associated with Cretaceous picrite (Outer Western Carpathians, Czech Republic): interaction between host rock and externally derived fluid

Thermochemical reduction and sulfur isotopic behavior of sulfate by acetic acid in the presence of native sulfur.

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