A tandem-flow assembly for the chemiluminometric determination of hydroquinone

A tandem-flow assembly for the chemiluminometric determination of hydroquinone A direct chemiluminescent procedure for determination of hydroquinone based on the emergent flow methodology known as multicommutation or tandem-flow is presented for first time. The manifold was based on a set of three channels and three solenoid valves; and, the determination was performed at 60 °C and at flow-rate of 7.5 ml min −1 . The complete cycle lasted 35 s, which resulted in a sample flow trough of 103 h −1 . The chemical process was the hydroquinone oxidation with the system sulphuric acid-potassium permanganate; and the light emission was clearly enhanced by the presence of quinine sulphate and benzalkonium chloride reaching a detection limit of 30 μg l −1 . The dynamic interval was over the range 0.1–15.0 mg l −1 and a large list of interferents were assayed; the chemical robustness was also tested. The method was applied to different type of samples: namely, pharmaceutical formulations, a photographic solution and irrigation and residual superficial waters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Talanta Elsevier

A tandem-flow assembly for the chemiluminometric determination of hydroquinone

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Publisher
Elsevier
Copyright
Copyright © 2004 Elsevier B.V.
ISSN
0039-9140
eISSN
1873-3573
D.O.I.
10.1016/j.talanta.2004.03.031
Publisher site
See Article on Publisher Site

Abstract

A direct chemiluminescent procedure for determination of hydroquinone based on the emergent flow methodology known as multicommutation or tandem-flow is presented for first time. The manifold was based on a set of three channels and three solenoid valves; and, the determination was performed at 60 °C and at flow-rate of 7.5 ml min −1 . The complete cycle lasted 35 s, which resulted in a sample flow trough of 103 h −1 . The chemical process was the hydroquinone oxidation with the system sulphuric acid-potassium permanganate; and the light emission was clearly enhanced by the presence of quinine sulphate and benzalkonium chloride reaching a detection limit of 30 μg l −1 . The dynamic interval was over the range 0.1–15.0 mg l −1 and a large list of interferents were assayed; the chemical robustness was also tested. The method was applied to different type of samples: namely, pharmaceutical formulations, a photographic solution and irrigation and residual superficial waters.

Journal

TalantaElsevier

Published: Oct 20, 2004

References

  • Analyst
    Firth, J.; Rix, I.
  • Talanta
    Du, J.; Li, Y.; Lu, J.

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