Utilization of Ultrafine Gas Bubbles to Investigate the Jones–Ray Effect of Diluted Salt Solutions

Abstract

The cause of the Jones–Ray effect has been controversially debated for years. Ultrafine gas bubbles were employed to lessen the surface excess of the surface-active impurities adsorbing to the air/water interface of the salt solutions, which would lead to a direct shift in surface tension observable by the Wilhelmy plate method. It was concluded in this study that once the surface excess of the inevitable impurities in the salts is lessened by the introduction of ultrafine gas bubbles, which possess great air/water interfacial area, the Jones–Ray effect becomes nonobservable. Therefore, our finding hypothesized that the Jones–Ray effect might not originate from salts.

Impurity contribution to ultraviolet absorption of saturated fatty acids

“…Commercially available chemical reagents are often assumed to be sufficiently pure for most experimental studies. However, much discussion has considered the possibility that undetectable trace amounts of impurities (micromolar or nanomolar concentrations) greatly affect experimentally observed phenomena (31)(32)(33)(34)(35)(36)(37)(38). Impurities can particularly influence the measurement of the UV absorption spectra of liquid samples because a large volume of sample is usually required: A typical quartz cuvette cell with an optical path length of 10 mm holds 3.5 ml.…”