According to several studies quoted here, chemicals can be absorbed by the skin transdermally, at least under certain conditions.
When it comes to elements in seawater like sodium, magnesium, potassium and iodine, is it possible for a human to absorb them transdermally in this instance?
If it depends on various conditions, (such as length of time spent in the ocean, physiological factors (e.g. intense swimming vs. gentle bathing), temperature of the water and their respective effects on skin porousness or other factors affecting transdermal absorption), what would be they be?
And if it can indeed be absorbed (e.g. from open water swimming), are the amounts significant to even measure alongside that of recommended levels for human dietary intake by advisory bodies such as FDA for those mentioned elements, or is it an extremely small amount much smaller than dietary levels of mineral intake?