Only three compounds were rated as dissolved in TFT. However, no signal changes resulting from the presence of fluoride ions in the aqueous solution were observed in these systems. These results suggest an incorrect assessment of the solubility of the tested compounds, their lower fluoride affinity in TFT solvent or generally higher transfer energy for TFT compared to DCE. Therefore, it is justified to continue research using other organic solvents and a more accurate method of assessing the dissolution of compounds in the organic phase.