New sensor based on AgCl containing Iron Oxide or Zinc Oxide Nanoparticles for Chloride Determination

This work describes preparation and application of “homemade” chloride ISE enriched with iron oxides or zinc oxide nanoparticles. The prepared chloride ISE membrane was made of AgCl:Ag2S:PTFE = 1:1:2 and AgCl:Ag2S:PTFE = 2:1:2 enriched with mentioned nanoparticles in ratio 0.5-1.2 wt.%. Prepared membranes were used for chloride determination in perchloric acid (pH = 0-2) and acetic buffer (pH = 4 – 4.75). Due to the low method price, simplicity and a reasonably fast way of usage, it was considered as a possibility for chloride determination in high acid media. Two of prepared membranes (M1 and M4) have shown best characteristics. M1 showed linear response range for chloride between 2.0×10−6 and 1×10−1 mol L−1, with a detection limit of 2.24×10−6 mol L−1 and potential change of 44.39 mV per decade. M4 showed linear response range for chloride between 4.2×10–6 to 1×10–1 mol L−1, limit of detection of 1.39×10–6 mol L−1 with potential change of 24.79 mV per decade at pH = 0.