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This work describes an analytical procedure for determination of petroleum hydrocarbons in petroleum-contaminated water. The method involves a solid-phase extraction method with stationary phase sorbent from natural raw material shungite. Method development was performed on model samples of water samples contaminated by petroleum from Tengiz deposit. The use of natural raw nanomaterial shungite as stationary phase solves the problems concerned with industry wastes, since this nanomaterial is waste of gold mining plant in Eastern Kazakhstan from dumps of the polymetallic Bakyrchik deposit. The proposed method provides a rapid, environmentally friendly and accurate method for identification and quantification of the petroleum hydrocarbons contaminating water resources of Western Kazakhstan. This work describes application of the developed methodology for analysis of petroleum hydrocarbons in the water resources of Western Kazakhstan. It was investigated that 5 g of sorbent was the optimal mass for solid-phase extraction of petroleum with concentration to 3000 mg/L. In addition, it was established that 5% hexane solution extracted petroleum more effectively from water samples. The most advanced stage of sorption of a sorbent occurs at 0.8 mm of a sorbent particles size. The optimum solvent for elution was chloroform, that allows to elute the greatest amount of petroleum hydrocarbons. Also, it was proved that an activated shungite has the highest sorption ability comparing to non activated (extraction recovery at concentration of 100 mg/L is equal about 90 and 40% for activated and non activated sorbents, respectively). [ABSTRACT FROM AUTHOR]

Indium is an important metal for our society. It is used for liquid crystal display (LCD) for portable computer, television, monitor etc. Although about 86 % of demand of the world is used in Japan, Japan imports almost all of the indium. Therefore indium recycling is very important. In this study, recovery of indium from waste-LCD by solvent extraction followed with solid phase extraction is studied. Old laptop computer was taken to pieces, and only glass board containing ITO (Indium Tin Oxide) in LCD is taken off. It is crushed and pulverized by planetary mill. Then the samples are extracted with some solvents. A variety concentration of hydrochloric acid and aqua regia are used as solvents. Higher liquid per solid ratio and higher concentration of acid raised the recovery rate of indium. [ABSTRACT FROM AUTHOR]