Determination of chloramphenicol by differential pulse voltammetry at carbon paste electrodes - The use of sodium sulfite for removal of oxygen from electrode surface

Ferenc T. Pastor, Hana Dejmková, Jiří Zima, Jiří Barek

Результат исследований: Материалы для журналаСтатья

3 Цитирования (Scopus)

Аннотация

The possibility of determination of chloramphenicol by differential pulse voltammetry at four different carbon paste electrodes, in the full pH range (2-12) of Britton-Robinson (BR) buffer was investigated. Electrodes were prepared by mixing spectroscopic graphite powder or glassy carbon microbeads with mineral oil (Nujol) or tricresyl phosphate. Under optimal conditions (BR buffer pH 12, the electrode prepared from glassy carbon microbeads and tricresyl phosphate), linear calibration graph was obtained only in 10-5 M chloramphenicol concentration range. Determination of lower concentrations of chloramphenicol was complicated by irreproducible peak of oxygen from the carbon paste which overlapped with peak of chloramphenicol. Addition of sodium sulfite removed the oxygen peak without influence on the peak of chloramphenicol. Under optimal conditions (electrode paste made from glassy carbon microbeads, BR buffer pH 10 and 0.5 M sodium sulfite), straight calibration line was obtained in the 10-6 and 10-5 M chloramphenicol concentration range. Limit of determination was 5 × 10-7 mol/l.

Язык оригиналаАнглийский
Страницы (с-по)383-397
Число страниц15
ЖурналCollection of Czechoslovak Chemical Communications
Том76
Номер выпуска5
DOI
СостояниеОпубликовано - 10 мая 2011
Опубликовано для внешнего пользованияДа

ASJC Scopus subject areas

  • Chemistry(all)

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