The paper presents the results of research on the content of 16 PAH, selected anions and heavy metals in samples collected from Lake Oleckie Wielkie. The samples were collected at seven locations around the lake within about 15 m from the shore in November 2012. The highest total concentration of 16 PAH (68.58 μmol dm -3 ) was found in water sample no. 7, and the lowest in water samples no. 1, 4 and 5. The obtained results do not exceed the levels of standards accepted in Poland for the surface water. The analysis of collected water samples, performed with the isotachophoresis method, showed a low content (less than 4 mg dm -3 ) of the analyzed anions: nitrates(V), nitrates(III), chlorides, sulphates(VI), sulphates(IV), phosphates(V) and hydrocarbonates(IV), as well as a low content of the analyzed heavy metals.
This paper presents the results of a study aimed at developing the extraction process and determining long-term stability of (E)-azastilbene derivatives in order to explore their possible use as preservative, antiseptic and disinfectant substances. The study was performed in three different matrices: distilled, surface and waste water. Test substances included bromide of (E)-N-(o-bro-mobenzyl)-4′-hydroxystilbazole-4 and chloride of (E)-N-(p-chlorobenzyl)-4′-hydroxystilbazole-4. The extraction process involved the use of three stationary phases: octyl, octadecyl and naphthylpropyl. The highest recovery values (amounting to approx. 95%) were obtained in the naphthylpropyl column for all of the above-mentioned matrices. A decline in the stability of the analysed derivatives after a 28-day period was below 14% in all matrix types.
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