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density fractionation
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Knowledge graph centered on density fractionation with 39 nodes and 142 connections. Top connected: leaf water content, carbon cycling, biogeochemical reactions, weathering, detritus breakdown.
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?
article
Molecular nature of mineral-organic associations within redox-active mountainous floodplain sediments
article