Laboratory shale leaching experiments

Knowledge graph centered on Laboratory shale leaching experiments with 15 nodes and 27 connections. Top connected: concentration-discharge relationship, River thorium concentrations can record bedrock fr, critical zone, bedrock fracture processes, dynamic earthquake triggering.

Method synopsis

Controlled laboratory experiments using pulverized Mancos Shale under simulated groundwater conditions to investigate thorium release mechanisms under different redox conditions.

Synthesized from method descriptions across 1 paper using this protocol.

Procedure as described in the canonical source

Steps below were extracted from the paper that introduces this protocol — River thorium concentrations can record bedrock fracture processes including some triggered by distant seismic events (2023), Nature Communications. Implementations in other papers (listed below) may differ.

1. Laboratory leaching experiments
   Simulated river water was prepared to match representative geochemical conditions for groundwater at PLM sites using 10 mM NaCl and 1 mM NaSO4 and NaNO3 in MilliQ water. Shale cores were pulverized and 2 ± 0.1 g portions placed in 50 mL vials with aerobic solutions, sparged for 48h
   Quantities: 10 mM NaCl, 1 mM each of NaSO4 and NaNO3, 2 ± 0.1 g shale portions in 50 mL vialsDuration: 48 hour sparging period, then centrifuged, filtered and measuredConditions: Aerobic and anaerobic solution conditions tested, pH adjusted by small additions of concentrated HCl
   Equipment: MilliQ water system, 50 mL vials, centrifuge, filtration equipment, concentrated HCl

Typical Equipment

• MilliQ water system
• 50 mL vials
• centrifuge

Output Measurements

• thorium release rates
• arsenic concentrations
• geochemical release patterns

Papers Using This Protocol (1)