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National Repository of Grey Literature 3 records found  Search took 0.02 seconds. 
Determination of alkylphenols, alkylphenolmonoethoxylates and alkylphenoldiethoxylates in water
 Hubka, T. ; Komárek, K. ; Kandelová, M. ; Šafaříková, Miroslava ; Šafařík, Ivo
The paper was focused on the determination of alkylphenols and their ethohxylates in water. Analytes were extracted by liquid extraction and magnetic solid phase extraction. For the preconcentration magnetically modified fillings for gas chromatography were tested. The yields of extraction were 30 – 70 % for alkylphenols with short alkyl chain and 60 – 100% for alkylphenols with the middle long chain. The yields of extraction were around 98% for nonylphenolmonoethoxylates and diethoxylates.
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Determination of nonyphenols in water by capillary gas chromatography after their extraction by liquid and magnetic solid phase
 Komárek, K. ; Pitter, P. ; Sýkora, V. ; Ptáková, H. ; Šafaříková, Miroslava ; Šafařík, Ivo
The work is focused on the determination of both technical nonyphenol (NP) and pure 4-n-nonylphenol (4-n-NP) in water samples after their prior liquid extraction or extraction on magnetic solid phase (MSPE). Extracted alkylphenols (AP) were analyzed by capillary gas chromatography (CGCL).
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The magnetic solid phase extraction as advanced and rapid method for isolation of hydrocarbons from water before analytical detection
 Komárek, K. ; Kandelová, M. ; Šafaříková, Miroslava ; Šafařík, Ivo
For existing methods for isolation and pre-concentration of hydrocarbons from aqueous phase, new process based on the magnetic solid phase extraction (MSPE) was proposed. By this way the magnetic sorbent is added into the water sample and the suspension is mixed for some little time. The sorbent with hydrocarbons is separated from aqueous phase using magnetic field. Hydrocarbons from the separated sorbent are eluted by small amount of solvent. The magnetic sorbent is isolated using magnetic field and acquired extract is applied to gas-liquid chromatography analysis. The optimal conditions for each sorbents have to be found for the individual steps of MSPE. The study is focused on the mix of aliphatic hydrocarbons (C10 – C13) and avgas. Magnetically modified activated carbon Chezacarb B was used as sorbent.
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