Table 1 Volatile speciation of the SOH fluids synthesized under controlled P–T–redox conditions and measured by quadrupole mass spectrometry

From: Analytical protocol for measuring micro-molar quantities of sulfur volatile species in experimental high pressure and temperature fluids

Synthesis

SOH-IW1

SOH-IW2

SOH-FMQ1

P (GPa)

3

3

3

T (°C)

700

700

700

Buffer assemblage

IW

IW

FMQ

Runtime (h)

6

5

5

Fluid phase

 μmol tot

36.05

106.72

31.68

μmol

 H2O

34.76 (0.08)

78.53 (0.14)

31.68 (0.10)

 H2

bdl

9.47 (0.02)

bdl

 H2S

1.03 (0.07)

14.06 (0.07)

bdl

 SO2

bdl

4.66 (0.09)

bdl

mol %

 H2O

97.1 (0.22)

73.6 (0.13)

100.0 (0.32)

 H2

–

9.00 (0.02)

–

 H2S

2.9 (0.20)

13.2 (0.07)

–

 SO2

–

4.36 (0.08)

–

Thermodynamic model

 H2O

86.65

86.56

99.99

 H2

1.2

1.2

–

 H2S

16.15

16.15

0.01

 SO2

–

–

–

  1. The total amount of fluid synthesized is expressed in μmol and calculated from the ideal gas law PV = nRT. The amount of the monitored species (μmol) derived from linear regression analysis performed through a specifically designed Wolfram Mathematica® routine. The volatile speciation of the SOH fluid is expressed as moles percentage on an air- and N2-free basis (mol%*). The thermodynamic model is reported for comparison. See the main text for further details.
  2. bdl below detection limit.
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