Yoshio Kuge

Determination of trialkyltin, dialkyltin, and triphenyltin compounds in environmental water and sediments

An analytical procedure for the determination of trialkyltin (tributyltin, tripropyltin), triphenyltin and dialkyltin (dibutyltin) compounds in environmental water and sediment was studied. Water samples were extracted into benzene with hydrochloric acid and sodium chloride. Sediment samples were extracted into methanolic hydrochloric acid and converted into benzene. Silica gel, which was impregnated with hydrochloric acid and activated, was used for clean-up of these compounds. These extracts of organotin chlorides were hydrogenated with an ethanol solution of sodium borohydride. Organotin hydrides were measured by gas chromatography with electron-capture detection. Recoveries of these compounds were ca. 70-95% from river water and sediment samples. The detection limits were 0.4-0.8 micrograms/l in water and 0.02-0.04 micrograms/g in sediment samples.

Copper (II) complexes with a subnormal magnetic moment

In the course of the study about copper(II) complexes of Schiff bases of type I1 obtained from salicylaldehyde derivatives and alkanol amines, we have isolated some interesting compounds, which have a subnormal magnetic moment.

Unmodified and acylated cyclodextrin stationary phases for liquid chromatographic separation of aromatic compounds

Abstract α- or β-cyclodextrin was immobilized on 3-μm silica particles. The resulting stationary phases are much more efficient than the corresponding stationary phases obtained from 10-μm silica particles in the separation of aromatic compounds. The former stationary phases can separate the o-, m- and p- isomers of toluidine or dinitrobenzene, whereas the latter cannot. These unmodified cyclodextrin stationary phases were acetylated, propionylated or benzoylated, and the retention behaviour of some aromatic compounds was studied. Acylation of the β-cyclodextrin stationary phase in particular improves the peak shapes and effects a selectivity change in the separation.