Abstract
The article is devoted to the development of an ionometric sensor for the determination of hexamethylenetetramine (HMTA). It was found that poorly soluble complex compounds with the composition (HMTA)3(PMo12O40)2 and (HMTA)3(PW12O40)2 are formed as a result of the interaction of the cation of the test substance with the anions of heteropoly acids. The obtained compounds were used as electrode active substances for polyvinyl chloride membranes of ionometric sensors. Phthalic acid derivatives (dibutyl and dioctyl phthalates) were used as solvents for plasticized membranes. The optimal composition of the membranes was established. The dependences of the electrochemical properties of the obtained sensor membranes on various factors were studied. This made it possible to choose the optimal conditions for the operation of the ionometric sensor. The response time of the sensor does not exceed 3 minutes, and the service life of the membrane (about 40 days) allows performing determination without replacement. The detection limit of hexamethylenetetramine using this sensor is 1.010–5 mol/l, and quantitative determination can be carried out in a fairly short time (5–10 min).
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