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density fractionation

Subcategory: physical separation
Standard reference: modified from the literature
Papers: 3 | Mentions: 4

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Description

Separation of sediment organic carbon into free light fraction (FLF), occluded light fraction (OLF), and heavy fraction (HF) using sodium polytungstate density separation at 1.65 g/mL with sonication to disrupt aggregates.

Typical Equipment

  • sodium polytungstate (SPT-0)
  • swinging bucket rotor
  • benchtop mixer (GCU05R)
  • Branson 450 Sonifier
  • MilliQ water

Output Measurements

  • mass percent of each fraction
  • organic carbon concentration
  • nitrogen concentration
  • C/N ratios
  • radiocarbon age

Papers Using This Protocol (3)

article

Quantifying the effect of petrogenic carbon on SOC turnover for two Rocky Mountain soils: when are petrogenic carbon corrections required?

2025Journal of Geophysical Research: Biogeosciencesusing
article

Molecular nature of mineral-organic associations within redox-active mountainous floodplain sediments

2023ACS Earth and Space Chemistryusing
article

Shale as a Source of Organic Carbon in Floodplain Sediments of a Mountainous Watershed

2020JGR Biogeosciencesusing

Places Where Used

East River Watershed

watershed2 papers

Sacramento-San Joaquin Delta

watershed1 paper

Atlantic Ocean

region1 paper

Gothic Road

stream1 paper

Gunnison County

county1 paper

Sacramento-San Joaquin River Delta

watershed1 paper

Gothic Quadrangle

region1 paper

Gothic, CO

study site1 paper

Amazon River Basin

watershed1 paper

Gunnison Basin

region1 paper