水銀用イオン選択性電極としてのヨウ化物感応電極

概要

論文の詳細を見る
Commercially available iodide sensitive electrodes were found to be successfully used for the determination of mercury(II) ion, when the measurements were carried out in a 12 N nitric or sulfuric acid solution. A linear calibration curve was obtained within the concentration range of mercury 10-7 to 10-3 M, and the slope of the curve was about 49 mV per decade of the concentration. The electrode potential reaches to a point of equilibrium within ten minutes after the electrode was immersed in the test solution having the concentration range of mercury presented above. A large amount of copper (II), lead, zinc, manganese (II), calcium, magnesium, aluminum, chromium (III, VI) and fluoride do not interfere the determination of mercury. Cyanide, bromide and chloride interfere to some extent. The electrode was applied to detect the end point of the titration of thiocyanate with standard mercuric nitrate solution.