Development of diazinon sensors using mixed membranes of nata de coco and Fe 3 O 4 nanoparticles on the SPCE (screen printed carbon electrode) surface has been carried out potentiometrically. The sensor design was conducted by optimization of Fe 3 O 4 nanoparticles added to the membrane by comparison of 50%, 67% and 75% (Fe 3 O 4 nanoparticles in the Nata de Coco) while pH optimization was performed at pH 4-5 using acetate buffer and pH 6-7 using phosphate buffer. The diazinon sensor of the result has been tested at range concentration of 10-12-10-5 mol.L-1. The results showed that the best sensor performance was used at a ratio of 67% Fe 3 O 4 nanoparticles and at pH 5. The Nernst factor was 34.5 mV/decade, in the range concentration of 10-11-5x10-8 molL-1 with a response time of 140 seconds.
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