Effect of electrolytes on the sensitivity of the thermal lens determination

The effect of some electrolytes on the detection limits and sensitivity coefficients of the thermal lens determination of model compounds of different types in aqueous solutions is studied. A significant increase in the sensitivity of thermal lens determination in electrolyte solutions is shown. For example, the sensitivity coefficient is doubled in 0.6 M H2SO4 and 1.2 M HNO3, regardless of the analyte nature. It is shown that the effect of electrolyte on the sensitivity of a thermal lens determination cannot be assessed a priori.