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It has been established that, with increase in the silver concentration in polymer film, there is a shift in position of the maximum in absorption spectra into the longwave region. Bands in the absorption spectra in the range 400-510 nm correspond to surface plasmon resonance (SPR) of the silver nanoparticles. It is shown that silvercontaining film is an adsorbent in relation to water vapour over saturated solutions of ammonium chloride, potassium nitrate, and sodium sulphate, with maximum sorption observed in the case of Na 2 SO 4 .

A method for the trace analysis of rhodamine and eosine with colorimetric measurements based on solid-phase extraction (SPE) by transparent polymethacrylate matrix (PMM) is described. Solid-phase extraction on PMM allowed a 380-fold enrichment of the dyes if 10 mL sample volume is used with extraction efficiencies 98%. The method enables the determination of rhodamine to 0.06 mg/L and eosine to 1.2 mg/L combined with a fast and easy sample-preparation (pH-adjusting prior to SPE). Simultaneous extraction and determination of rhodamine and eosine in reservoir samples with high salinity confirmed the applicability and reproducibility of the method. Batch adsorption results indicated that Langmuir isotherm described the adsorption isotherms better.

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