J. Planar Chromatogr. 3, 157-159 (1990). Separation of cationic ion mixtures of Mo, Re, W, and V by chromatography on alumina layers with aqueous solutions of inorganic and organic acids. These were compared with the separation of same substances on same layers with same solutions under application of a voltage gradient. The relationship between Rf values and concentrations of acids in the mobile phase were investigated and conclusions drawn. Chromatograms and electropherograms were visualized with 20% SnCl2 solution in HCl 1:1 and aqueous solution of NH4SCN. Good method to separate mixtures and to obtain information on ionic forms of rare element ions in aqueous solutions.

J. Planar Chromatogr. 7, 166 (1994). TLC of copper sulfate on silica with methanol - acetic acid 100:0.3. Detection by spraying with alkaline 2-thiobarbituric acid solution. Detection limit of the reagent is ca 100 µg.

Planar Chromatogr. 8, 469-472 (1995). TLC of 49 inorganic ions on silica impregnated with tri-n-octylamine with aqueous sulfuric acid and sulfuric acid - ammonium sulfate solutions (0.01, 0.1, and 1.0 M ). Detection see T. Shimizu, N. Iwata, Y. Tamura, J. Planar Chromatogr. 7, 98-102 (1994).

J. Planar Chromatogr. 11, 127-131 (1998). TLC of solutions of Mn, Co, Ni, Cu, Zn, Y, Nd, Sm, Eu, Gd, Th, Dy,and Yb chlorosulfates on chicken-egg-shell powder or mixtures thereof with cellulose or silica gel with 31 different mobile phases. 1% aqueous solutions of potassium ferrocyanide were used for detection of Cu chlorosulfate, ethanolic dimethyl glyoxime for detection of Ni and Co chlorosulfates, a 0.5% solution of dithizone in chloroform for detection of Zn and Mn chlorosulfates, and aqueous arsenazo(III) solution for detection of all rare earth chlorosulfates.

J. Planar Chromatogr. 15, 367-369 (2002). TLC separation of Al(III), Cr(III), Cu(II), Fe(III), Mn(II), Ni(II), Pb(II), Sn(IV) and Zn(II) on cellulose with acetonitrile - HCl - water 73:15:12 in the x direction and 2-pentanol - acetonitrile - HCl 3:2:5 in the y direction. Visualization by spraying with quercetin (+ dimethylglyoxim + NH3 ) - the most suitable out of 12 reagents tested; prepared by dissolving 0.1 g quercetin in 100 mL 2-propanol and 1.0 g dimethylglyoxime in 100 mL ethanol by heating. Rapid, simple and inexpensive screening method.

Quantitative determination of nickel chlorosulphate. Acta Chrom. 11, 154-170 (2001). Several stationary phase – mobile phase combinations were evaluated to identify suitable chromatographic systems for analysis of metal chlorosulphates. The effect of anionic species on the mobility and separation of metal chlorosulphates was examined. Quaternary separation of the chlorosulphates (Mn, Fe, Ni, and Cu or Zn) on silica gel – cellulose 2:1 with double-distilled water. Detection of Cu and Fe by spraying with 1 % aqueous potassium ferrocyanide, of Ni and Co with 1 %, and of Zn and Mn with 0.5 % dithizone in chloroform. For the quantitative determination of nickel the substances were extracted with distilled water, and buffer solution (1 M ammonium hydroxide - 1 M ammonium chloride 1:1) with bromo-pyrogallol red indicator (0.05 g in 100 mL ethanol – water 1:1) was added. The mixture was titrated with 0.05 M aqueous EDTA solution.

Chromatographia 30, 405-409 (1990). Investigation of the TLC behavior of 13 anions on silica and silica impregnated with copper sulfate solution, with aqueous-organic solvents containing acetone. Examination of the effect of copper sulphate concentration on the mobility of anions. Comparison of the results on two kinds of layer. Discussion of the effect of anion loading on Rf values. Change of the selectivity on impregnated layers. Aqueous sodium chloride - acetone 9:1 were the most effective solvens systems for differential migration of anions.

J. Liquid Chromatogr. 8, 571-574 (1985). Separation of thirteen metal ions on silica impregnated with 2,2'-dipyridyl and iminodiacetic acid using the solvent systems: isoamyl alcohol - water - acetic acid 2:1:1 and methanol - benzene - acetic acid 20:10:15. Detection by spraying first with 1 % ethanolic alizarin solution and then with dithizone (0.5 %) in CCl4.