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XRF AND MINERALOGY (5 replies)

Tobi
1 month ago
Tobi 1 month ago

How best can one determine the total elemental composition of a substance/sample after been roasted?

rgardila
1 month ago
rgardila 1 month ago

One good idea is trohugh ICP (Inductively coupled plasma mass spectrometry). 

dicksonp63
1 month ago
dicksonp63 1 month ago

For elemental analyses - agree total digestion of solids then ICP, AA, ICP-MS (any of these)

If you want to know the mineralogy/crystal structures, etc then QEMSCAN can't be beat.  The labs who perform this work typically also do XRD as a back up/check.

Sugar Watkins
1 month ago
Sugar Watkins 1 month ago
max skinner
1 month ago
max skinner 1 month ago

For total elements and percentage, ICP is tough to beat. I can do a reasonable job with my hand held XRF gun. For the actual minerals involved a person well versed with the use of a electron microscope can do a great job of mineral identification. 

inOr
1 month ago
inOr 1 month ago
1 like by Adamfocus

My understanding is that XRF is a semi-quantitative  technique.  Measurements of concentrations of elements are not very precise, so low concentrations give meaningless results.  You don't say which elements are of interest to you.  Elements with low molecular weights are indetectable.  XRF is more suited to field use, hence the market for hand-helds.  ICP and related methods are much more precise, and commercial laboratories with the proper instrumentation and expertise are commonplace.