We describe a new kinetic method for potentiometric determination of creatinine in serum, based on the creatinine--picrate reaction in alkaline medium (Jaffé reaction). The reaction is monitored with a picrate-selective electrode, and the increase in electrode potential during 270 s is measured and related directly to the creatinine concentration. Small cation-exchange columns are used to separ...

This study presents a flow injection system for the sequential determination of free (CN(-)) and total (CN(-)+ HCN) cyanide using a potentiometric method which employs two different processes for the determination of these two chemical species. The first process is based on direct detection of CN(-) using an ion-selective electrode for cyanide. In the second process, the sample is mixed with ac...

A plastic membrane electrode for the determination of methacycline hydrochloride was fabricated based on the use of methacycline-tetraphenylborate as the electroactive substance, and dioctylphtalate as the plasticizing agent. It was found that the potential responses of the electrode were influenced by pH of the tested solution when pH>3. Under the condition of pH 2.6, the linear response range...

Zirconium oxy-salts were hydrolyzed to form positively charged polymer or cluster species in acidic solutions. The zirconium hydrolyzed polymer was found to react with a negatively charged polyelectrolyte, such as poly(vinyl sulfate), and to form a stoichiometric polyion complex. Thus, colloidal titration with poly(vinyl sulfate) was applied to measure the zirconium concentration in an acidic s...

Ž . Ž . An ion-selective field effect transistor ISFET was applied as a potentiometric detector in liquid chromatography LC for the Ž determination of organic acids. The ISFET was prepared by coating the gate insulator of the encapsulated transistor with a poly vinyl . Ž . chloride PVC matrix membrane containing methyltridodecylammoniumchloride, which enables the detection of organic anions. Th...