Stepped-temperature elemental analysis

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Method synopsis

Stepped-temperature thermal analysis to quantify readily oxidizable organic carbon (OC400), total inorganic carbon (TIC), and residual organic carbon (ROC) fractions with different thermal stabilities.

Synthesized from method descriptions across 15 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Quantifying the effect of petrogenic carbon on SOC turnover for two Rocky Mountain soils: when are petrogenic carbon corrections required? (2025), Journal of Geophysical Research: Biogeosciences. Implementations in other papers (listed below) may differ.

1. Carbon analysis via ramped combustion
   Bulk soils, density fractions, vegetation, and shale samples analyzed for readily oxidizable organic carbon (OC400), total inorganic carbon (TIC), and residual organic carbon (ROC) using stepped-temperature elemental analysis. Samples heated from ambient to 400°C at 90°C/min under oxidizing conditions, then to 900°C at 110°C/min under nonoxidizing conditions, finally to 900°C under oxidizing conditions.
   Quantities: Temperature steps: ambient to 400°C, then 900°C, then 900°C oxidizingDuration: 6 min at 400°C, 2.5 min pyrolysis, 2.25 min oxidationConditions: Controlled temperature ramping with N2O and O2 gas mixtures
   Equipment: Soil TOC Elementar Inc.

Typical Equipment

• Soil TOC Elementar Inc.

Output Measurements

• OC400 content
• TIC content
• ROC content

Papers Using This Protocol (15)

Species Studied With This Protocol

Places Where Used