Soil and rock leachate analysis

Knowledge graph centered on Soil and rock leachate analysis with 12 nodes and 24 connections. Top connected: Pekania pennanti, East River, Bedrock weathering contributes to subsurface react, drive-point piezometer groundwater sampling, Gothic CASTNET station.

Method synopsis

Laboratory leaching of soil and rock samples using artificial groundwater solutions to determine nitrogen and ion release potential. Samples are powdered and equilibrated with solution for chemical analysis.

Synthesized from method descriptions across 1 paper 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 — Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions (2021), Nature Geoscience. Implementations in other papers (listed below) may differ.

1. Collect soil and rock samples
   Hand-cored soil samples at 0.1 m depth increments down to 40 cm where no bedrock outcrops were present. Rock samples collected in 0.6-0.7 m depth increments from boreholes at locations PLM1-PLM6
   Quantities: 40 hand-cored soil samples plus rock samples at 0.6-0.7 m increments from boreholesDuration: Sampling conducted over 3 days then storedConditions: Field sampling conditions
   Equipment: hand-auger, core sampling equipment
2. Collect and analyze porewater samples
   Collected porewater samples from soil and rock leachates using artificial groundwater recipe of 5mM CaCl₂ and 5mM NaCl in equilibrium with atmospheric CO₂. Solid-to-water ratio 1:10. Samples powdered to about 500μL and slow mixed for 24h
   Quantities: Multiple porewater samples collected over 3-year period at different depthsDuration: 24 hours slow mixing, samples collected over 3 yearsConditions: Laboratory conditions, equilibrium with atmospheric CO₂
   Equipment: laboratory mixing equipment
3. Analyze nitrogen species and dissolved ions
   Measured dissolved organic carbon, total dissolved nitrogen, and nitrogen species concentrations using Shimadzu TOC-VCSH carbon analyzer and TNM-1 nitrogen module. Analyzed dissolved species including SO₄²⁻, Ca²⁺, Mg²⁺, and other ions
   Quantities: Analysis of all collected porewater samples for multiple chemical parametersDuration: Not specified for individual analysesConditions: Laboratory analytical conditions
   Shimadzu TOC-VCSH carbon analyzer, TNM-1 nitrogen module, inductively coupled plasma mass spectrometer

Typical Equipment

• hand-auger
• core sampling equipment
• laboratory mixing equipment
• Shimadzu TOC-VCSH carbon analyzer
• TNM-1 nitrogen module
• inductively coupled plasma mass spectrometer

Output Measurements

• dissolved organic carbon
• total dissolved nitrogen
• nitrogen species concentrations
• dissolved ion concentrations

Papers Using This Protocol (1)

Species Studied With This Protocol

Places Where Used