PVC Matrix Membrane Sensor for Potentiometric Determination of Cetylpyridinium Chloride.
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- MOSTAFA Gamal A. E.
- Microanalytical Laboratory, Applied Organic Chemistry Department, National Research Center
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Abstract
A novel cetylpyridinium chloride-selective membrane sensor consisting of cetylpyridinium-ferric thiocyanate ion pairs dispersed in a PVC matrix placticized with dioctylphthalate is described. The electrode shows a stable, near-Nernstian response for 1 × 10-3 - 1 × 10-6 mol l-1 cetylpyridinium chloride (CPC) at 25°C over the pH range 1 - 6 with a cationic slope of 57.5 ± 0.4. The lower detection limit is 8 × 10-7 mol l-1 and the response time is 30 - 60 s. Selectivity coefficients for CPC relative to a number of interfering substances were investigated. There is negligible interference from many cations, anions and pharmaceutical excipients; however, cetyltrimethylammonim bromide (CTMAB) interfered significantly. The determination of 0.5 - 350 µg/ml of CPC in aqueous solutions shows an average recovery of 98.5% and a mean relative standard deviation of 1.6% at 56.0 µg/ml. The direct determination of CPC in Ezafluor mouthwash gave results that compare favorably with those obtained by the British Pharmacopoeia method. Precipitation titrations involving CPC as titrant are monitored with a CP sensor. The CP electrode has been utilized as an end point indicator electrode for the determination of anionic surfactants in some commercial detergents.
Journal
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- Analytical Sciences
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Analytical Sciences 17 (9), 1043-1047, 2001
The Japan Society for Analytical Chemistry
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Keywords
Details 詳細情報について
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- CRID
- 1390001204257364736
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- NII Article ID
- 10007177636
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- NII Book ID
- AA10500785
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- COI
- 1:CAS:528:DC%2BD3MXntFWqtbg%3D
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- ISSN
- 13482246
- 09106340
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- NDL BIB ID
- 5911566
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- PubMed
- 11708056
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed