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The unique study of TiO 2 sol-gel modified carbon paste electrode (CPE) nanocomposites have been developed for electrochemical sensor detecting fipronil pesticide compound. We develop the easy synthesized TiO 2 via a sol-gel method and modified in CPE which applied electrochemical system as cyclic voltammetry (CV) because the concentration is proportional with current peaks. We discover the TiO 2 optimal mass used of 0.1 g which is compared with 0.7 g carbon and 0.3 mL paraffin. It has high-current anodic (Ip a) of 1.13×10 3 μA and high-current cathodic (Ip c)-0.96×10 3 μA in scan rate of 0.5 V/s. The limit of detection (LOD) of fipronil has been determined of 34.0×10-5 μM in percent recovery of 0.8%. Its high-stability for lifetime TiO 2-CPE nanocomposites was expressed for 13 days which mean that can be used for detecting fipronil pesticide.

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