Iodide Thiocyanate Research Articles

Determination of iodide, thiocyanate and perchlorate ions in environmental water by two-dimensional ion chromatography

A procedure for the determination of iodide, thiocyanate and perchlorate ions in environmental water by two-dimensional ion chromatography has been developed. At first the iodide, thiocyanate and perchlorate ions were separated from interfering ions by a column (IonPac AS16, 250 mm x 4 mm). The iodide ion, thiocyanate and perchlorate ions were then enriched with an enrichment column (MAC-200, 80 mm x 0.75 mm). In the 2nd-dimensional chromatography, iodide thiocyanate and perchlorate ions were separated and quantified by a capillary column (IonPac AS20 Capillary, 250 mm x 0.4 mm). The linear ranges were 0.05 -100 pg/L with correlation coefficients of 0. 999 9, and the detection limits were 0. 02 - 0.05 micro gg/L. The spiked recoveries of iodide, thiocyanate and perchlorate ions were in the range of 85.1% to 100.1%. The relative standard deviations of the recoveries were 1.7% to 4.9%.

ESR in Mercury(II) Iodide Thiocyanate

Abstract Powder of mercury(II) iodide thiocyanate (HgISCN) gives a weak electron spin resonance (ESR) signal at g=2.003 in the dark. When the powder is irradiated, the ESR-signal intensity increases during the exposure. When the light is turned off, the intensity decreases. The ESR-signal may be due to electrons trapped by lattice defects.

Chronocoulometric measurement of indium(III) adsorption from thiocyanate medium

The adsorption of indium(III) at a mercury electrode from acidified thiocyanate medium has been quantitatively characterized using the chronocoulometric technique. The indium(III) surface excess increases at more positive electrode potentials and passes through a maximum at 0.1–0.2 M thiocyanate concentration. Indium(III) gave no detectable adsorption from iodide or bromide media, nor did nickel(II) adsorb from thiocyanate medium. There appears to be no obvious correlation between the catalysis of indium(III) reduction by thiocyanate iodide, and bromide ions and the tendencies of these anions to cause indium(III) adsorption. Some discussion of the problems of interpretation of the electrode potential and ligand concentration effect on metal complex adsorption is given.

Chronocoulometric measurement of indium(III) adsorption from thiocyanate medium

The adsorption of indium(III) at a mercury electrode from acidified thiocyanate medium has been quantitatively characterized using the chronocoulometric technique. The indium(III) surface excess increases at more positive electrode potentials and passes through a maximum at 0.1–0.2 M thiocyanate concentration. Indium(III) gave no detectable adsorption from iodide or bromide media, nor did nickel(II) adsorb from thiocyanate medium. There appears to be no obvious correlation between the catalysis of indium(III) reduction by thiocyanate iodide, and bromide ions and the tendencies of these anions to cause indium(III) adsorption. Some discussion of the problems of interpretation of the electrode potential and ligand concentration effect on metal complex adsorption is given.