Analytical tools to study a rock H2 potential with their characteristics.
|Limit of detection
|Duration of preparation/analysis/processing
|Characterization of the Total Organic Content (TOC)
|Powder (~10 mg)
|Access to mineral and organic contents but also thermal analysis of C and S
|Major elements concentrations (Fe, S, U, Th, K)
|Does not detect trace elements
|Depends on the element
|Soli, powder, liquid
|Inductively Coupled Plasma – Mass Spectrometry/Optical Emission Spectroscopy (ICP-MS/OES)
|Majors, minors, traces, and ultra-traces concentrations (Fe, S, U, Th, K)
|Powder (~100 mg)
|57Fe Mössbauer spectroscopy
|Identification and quantification of iron-bearing phases and iron specification in each phase
|Powder (~400 mg)
|Phase identification, quantitative composition
|Do not differentiate polymorphs or minor phase
|Powder (~500 mg)
|Paragenesis, texture, alteration features
|Electro Probe Micro-Analyzer (EPMA)
|Quantitative measurements of concentration of the element heavier than Li (Fe, S, U, Th, K) punctual or map
|Scanning Electron Microscopy (SEM)
|High-resolution imaging demi-quantitatve measurements of concentration of the element heavier than Li (Fe, S, U, Th, K) punctual or map
|X-Rays Microtomography (XCT)
|Volume and propagation of elements of interest-bearing phase in the whole rock
|No chemical information, can be hard to distinguish chemically close phases, post-processing can be challenging, time consuming
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