The research of preparation of methanyl yellow sensor based on chitosan using dioctyl sebakat(DOS) as a plasticizer has been carried out. The aim of this research to determine the optimum membrane composition and the soaking time. The variation of membrane composition consist of chitosan:

Determination of formaldehyde using sensor formaldehyde. The aim of this study was to make SPCE-based formalin sensors using cellulose acetate as ionophore by studying the effect of pH, response time and its application on salted fish samples. The results showed that the formalin sensor gave the optimum measurement results at the pH of the solution at 4 with a response time of 10 seconds. The results of measuring formalin in salted fish using sensors compared to the spectrophotometric method gave results that were not significantly different.

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