Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Microextraction preconcentration with nonionic surfactants and colorometric determination of phenol

The extraction of the tungsten blue complex formed by the reaction of phenol with Folin-Ciocalteu reagent (FCR) in the presence of a nonionic surfactant Triton X-100 in alkaline medium using the methodology of micellar extraction based on «clouding point» has been studied for the fi rst time. Aqueous solutions of sodium carbonate and sodium sulfate were used to create pH and as a desalting agent.

Analytical reactions of 2,4-dinitrophenylhydrazine with some aldehydes in micelles of cationic surfactants

The analytical eff ect of micelles of cationic surfactants in the reactions of some aromatic aldehydes (AA) with 2,4-dinitrophenylhydrazine (DNPH) with the formation of the corresponding aci-forms of hydrazones has been established. It has been established that micelles of nonionic and anionic surfactants do not cause analytically signifi cant eff ects in the system under study.

Chromatographic Separation of Some Triazines by HPLC

Sorption properties of simazine, atrazine, propazine and prometrin on commercial chromatographic columns of LiChrospher 60 RP select B, Hypersil BDS-C18, and Zorbax SB-C18 were studied by reversed-phase high-performance liquid chromatography with photodiode matrix detection. The influence of the composition of the mobile phase on the chromatographic characteristics of the separation is considered. It was found that with the content of acetonitrile in a mixture of PF from 10 to 30 vol/vol. the chromatographic peak of atrazine is practically not manifested.

Determination of thymol with micellar extraction preconcentration

For the efficient preconcentration of azo compounds – products of the interaction of 4-nitrophenyldiazonium with thymol, a system 4-nitroaniline (4-NA) – NO2 - – Triton X-100 – NaOH – ethanol has been proposed. The optimal conditions for the formation of micellarsaturated phases of the system under study have been established: 3. 10-4 M 4-NA – 3. 10-4 M NO2 - – 5% Triton X-100 – 2.8 M NaOH – 10 vol. % С2Н5ОН. A spectrophotometric study of the above system has been carried out.