It is interesting to see that there is a clear difference between exhaled air from volunteers standing in the pool water and on the pool surrounds. The authors state that this difference can be explained by the dermal uptake of bathing. Another explanation could be that the concentration of CHCl3 in the pool air above the pool water is higher compared to its concentration above the pool surrounds. Also the heart rate of submerged volunteers will be higher compared to the dry volunteers because of the water pressure, possibly also a higher breath-volume was present. Finaly the blood pressure in submerged volunteers will be higher probably affecting the uptake of volatile components as well, because the solubility of volatile compounds increases at higher pressure. It would have been interesting to see if the same results could be obtained if the dry volunteers would also be present in the pool water next to the bathing volunteers, wearing a wetsuit to keep them dry. In this way, all variables for both bathing and standing would be more or less the same and the observed difference in exhaled air is most likely due to dermal uptake.
Article Trihalomethanes in chlorine and bromine disinfected swimming...
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