Table 6 Representative analyses of quenched H2O-rich C-O-H-N fluids (rel.%) obtained in unbuffered runs at 6.3 GPa.

From: Carbon and Nitrogen Speciation in N-poor C-O-H-N Fluids at 6.3 GPa and 1100–1400 °C

Run#

1315_3_5

1720_2_2

Capsule

Pt

Pt

Temperature (°C)

1200

1400

Duration (hr)

7

7

Starting composition*

Stearic acid

Stearic acid

Water

93.5

96.3

Alkanes

CH4

2.9

0.06

C2H6

0.7

1.4

C3H8

0.4

0.08

C4H10

1.0

0.8

C5H12

0.02

0.1

C6-C14 **

—

≤0.08

C15-C19

≤0.04

≤0.2

Olefins

—

—

Arenes

—

≤0.008

Alcohols and ethers

≤0.7

≤0.01

Aldehydes

≤0.003

≤0.01

Ketones

—

≤0.01

Carboxylic acid

≤0.008

<0.07

Furans

≤0.006

≤0.01

Nitrogen species

 N2

0.5

0.01

 CH3N

—

—

  1. *All samples contained graphite. **The quoted concentrations are maximum for a species of the respective group. All GC-MS data are given in Supplementary Table.
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