|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Capillary gap flow cell as capillary-end electrochemical detector in flow-based analysisстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 апреля 2019 г.
- Авторы: Islam M.A., Lam S.C., Li Y., Atia M.A., Mahbub P., Nesterenko P.N., Paull B., Macka M.
- Журнал: Electrochimica Acta
- Том: 303
- Год издания: 2019
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 85
- Последняя страница: 93
- DOI: 10.1016/j.electacta.2019.02.026
- Аннотация: A gap flow cell (gap-FC) as a capillary-end electrochemical (EC) detector, incorporating exchangeable screen-printed electrodes, that facilitates adjustment of the gap distance between the capillary outlet and working electrode down to 30 μm was investigated. The analytical performance of the gap-FC was assessed in terms of detector response (current), the efficiency of EC conversion of ferrocyanide, and effective cell volume, as a function of flow rate and gap distance, within a range of 0.1-200 μL min-1 and 30-100 μm, respectively. As a result, an efficiency of EC conversion within the range of ~1.5-11% (~3-16 times higher than wall-jet FC), at an effective cell volume of ~30-75 nL, was achieved. The gap-FC was applied as a liquid chromatography EC detector, coupled with standard and capillary format liquid chromatographs, where the analytical performance of gap-FC was compared with that of a UV detector. With the standard LC, the sensitivity for ascorbic acid, 2,3-dihydroxybenzoic acid and pyrocatechol, was greater than with the UV detector, with limits of detection (LODs) one order of magnitude lower for the gap-FC (0.10 μM, 0.09 μM, 0.19 μM, respectively, RSD 1.35-3.8 %, n=9; linearity r2 ~0.99 for concentration range 1-100 μM). LODs of test electroactive solutes using the gap-FC were ~2 times lower than LODs reported in existing literature using standard EC detectors, including wall-jet and thin-layer FCs.
- Добавил в систему: Нестеренко Павел Николаевич