Gas-chromatographic determination of phenols in aqueous samples after solid phase extraction

Abstract

27 phenols including mono- di-, tri-, tetra- and pentachlorophenols, mono- and dinitrophenols, mono- and dinitrocresols and dimethylnitrophenols have been extracted from aqueous samples by solid phase extraction using both modified silica gel (C18) and XAD resin-ad-sorbents and determined by gas chromatography (GC) using capillary columns with specially desactivated weakly polar phases. If a 1 l sample of spiked water is used, a considerable breakthrough is observed with phenol itself, while all other phenols are almost quantitatively extracted. The recovery of phenol itself can be improved by employing smaller sample volumes

Phenolic Compounds in Particles of Mainstream Waterpipe Smoke

“…The vials were capped and heated at 80 o C for 30 min to obtain the trimethylsilyl derivatives of phenols analyzed by GC-MS-SICP. The derivatization step was recommended by Mußmann, Levsen, and Radeck (1994) to avoid the broadening and tailing of chromatographic peaks otherwise characteristic of phenols due to their high polarity. The GC-MS-SICP method ensures high selectivity even though standards of phenolic derivatives are not available.…”

Novel materials and methods for solid-phase extraction and liquid chromatography

“…The analyte is selectively adsorbed on the surface of the sorbent which is then easily separated from the sample. SPE has many advantages over the traditional LLE, including reduced analysis time through automation [2-61, [43,44].…”

Determinação voltamétrica de 4-clorofenol sobre o eletrodo de diamante dopado com boro utilizando a voltametria de onda quadrada

“…Os níveis de 4-CF no ambiente são normalmente quantificados usando uma ou mais combinações de técnicas cromatográficas 5,6 . Tais métodos são precisos, sensíveis e seletivos, mas são trabalhosos e relativamente caros.…”

“…Outro fator que também despertou interesse para o estudo do 4-CF é por ele ser um típico clorofenol e ter uma estrutura semelhante à de diversos outros pesticidas. Assim, ele pode servir como molé-cula modelo de uma diversidade de poluentes no desenvolvimento de uma metodologia eletroanalítica.Os níveis de 4-CF no ambiente são normalmente quantificados usando uma ou mais combinações de técnicas cromatográficas 5,6 . Tais métodos são precisos, sensíveis e seletivos, mas são trabalhosos e relativamente caros.…”