The 2006 Steinhauser study did more than identify trace elements in rock salt; it also investigated how much of those elements could dissolve in an acidic environment.
For related guides and articles, see the Georg Steinhauser section.
Simulating Stomach Acid
The researchers dissolved an equivalent amount of the sodium-chloride samples in dilute hydrochloric acid to simulate stomach acid.
Insoluble material was filtered off and the dissolved fraction was analysed.
Estimate of Bioavailability
The experiment did not directly measure clinical bioavailability in humans; it estimated potential availability from acid solubility.
It therefore distinguishes between an element being present in salt and being soluble under simulated digestive conditions.
Importance for Rock-Salt Analysis
Some trace elements in natural rock salt may reside in insoluble clay or other mineral phases.
Acid-solubility testing adds a chemical-accessibility dimension beyond total elemental concentration.
Related article: Georg Steinhauser and the 18-Sample Rock Salt Study.
Sources
Rock Salt Brands and Supply Channels
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