SO2 preparation line

Conversion of oxygen in sulfate to CO2

Extraction of water from rocks by induction heating

Hydrogen extraction from rocks and minerals:

Water is quantitatively extracted from rocks and minerals with induction heating. The water is converted to H₂, followed by volumetric determination and δD determination with mass spectrometry (VG SIRA10).

Oxygen extraction from rocks and minerals:

Rocks and minerals are decomposed with BrF₅ to extract oxygen. The oxygen is converted to CO₂ for later determination of δ¹⁸O values with mass spectrometry (VG PRISM).

Oxygen extraction from sulfates:

Oxygen in sulfate is recovered as CO₂ using graphite reduction of BaSO₄ for δ¹⁸O determination of sulfate.

Carbon extraction from carbonates:

Carbonates are decomposed with 100% phosphoric acid to extract CO₂ for later δ¹³C and δ¹⁸O determination with mass spectrometry (VG PRISM).

Sulfer extraction from rocks and sulfides:

Sulfur in rocks is extracted as SO₂ in a vacuum system using Kiba solution (a concentrated phosphoric acid containing stannous chloride) for later δ³⁴S determination with mass spectrometry (VG SIRA 10).
Sufides and other S-containing material are oxidized to SO₄^2- and converted to BaSO₄. The BaSO₄ is thermally decomposed to SO₂ in a vacuum line followed by δ³⁴S determination.

person(s) whom users should contact: Ryoji TANAKA