surfactants

Determination of thymol with micellar extraction preconcentration

Authors: Tsygulyova E. I., Doronin S. Y.

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.

Chromatographic Separation of Some Triazines by HPLC

Authors: Arabskaya M. А., Kazemirova M. А., Smirnova T. D.

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.