Direct determination of traces of beryllium with eriochrome cyanine R by diffuse reflection spectroscopy using chromaticity functions.

Chromaton-N-super and Silasorb C18 (SMT C18) were compared as solid supports for the direct determination of the immobilized beryllium complexes with eriochrome cyanine R by diffuse reflection spectroscopy. The advantage of Silasorb C18 was shown. A detection limit of 0.0002 microg mL(-1) could be reached in a 100-mL sample. The method was used for the analysis of real water samples.

Improvement of direct determination of trace nickel in environmental samples by diffuse reflection spectroscopy using chromaticity characteristics.

Cellulose and chromaton-N-super as solid supports for direct determination of the immobilized nickel complexes with dimethylglyoxime and benzyldioxime by diffuse reflection spectroscopy were compared. The advantage of chromaton-N-super with use of benzyldioxime is shown. Detection limit is 0.02 microg/mL. The proposed method was applied for the analysis of soil.

[The effect of the temperature factor on the structural status of the rat dental enamel]. / Vliianie temperaturnogo faktora na strukturnoe sostoianie émali zubov krys.

Effects of various temperature regimens on enamel ultrastructure were examined by scanning electron microscopy in 70 rat incisors. The study has revealed a deep restructuring of the enamel during overheating in the course of tooth preparation, which necessitates the use of appropriate agents for the prevention and correction of the changes developing in dental tissue.