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.
Similar content being viewed by others
References
G. Kosswig and H. Stache, “Die Tenside”, 1993, Carl Haser Verlage, Munchen and Wien.
K. Yamamoto and S. Motomizu, Anal. Chim. Acta, 1991, 246, 333.
T. Sakai, N. Ohno, T. Kamoto, and H. Sasaki, Mikrochim. Acta, 1992, 106, 45.
S. Motomizu, M. Oshima, and Y. Hoso, Mikrochim. Acta, 1992, 106, 67.
K. Levsen, M. Emmrich, and S. Behnert, Fersenius’ J. Anal. Chem., 1993, 346, 732.
K. Yamamoto and K. Sakuno, Bunseki Kagaku, 1997, 46, 653.
S. Motomizu, Y.-H. Gao, K. Uemura, and S. Ihsihara, Analyst, 1994, 119, 473.
N. Buschmann and R. Schulz, Tenside, 1993, 29, 128.
N. Buschmann and R. Schulz, Tenside, 1993, 30, 18.
A. F. Shoukry, S. S. Badawy, and R. A. Farghali, Anal. Chem., 1988, 60, 2399.
L. Campanella, L. Aiello, C. Colapicchioni, and M. Tomassetti, Analusis, 1996, 24, 387.
V. V. Egorov, V. A. Repin, and V. E. Kaputskii, J. Anal. Chem., 1996, 51, 986.
K. Vytras, Mikrochim. Acta, 1984, III, 139.
K. Vytras, J. Kalous, and J. Symersky, Anal. Chim. Acta, 1985, 177, 219.
K. Heinig, C. Vogt, and G. Werner, Anal. Chem., 1997, 358, 500.
L. Nitschke, R. Muelles, G. Metzner, and L. Huber, Feresenus’ J. Anal. Chem., 1992, 342, 711.
S. M. Gort, E. A. Hogendoorn, R. A. Baumann, and P. Van Zoonen, Int. J. Environ. Anal. Chem., 1993, 53, 289.
S. S. M. Hassan, M. N. Abbas, and G. A. E. Mostafa, Anal. Lett., 1998, 31, 777.
S. S. Hassan, M. N. Abbas, and G. A. E. Mostafa, Talanta, 1996, 34, 797.
V. V. Cosofret and R. P. Buck, Crit. Rev. Anal. Chem., 1993, 24, 1.
H. Gorathi, G. Subramanian, N. Chandra, and G. P. Rao, Talanta, 1983, 30, 861.
T. S. Ma and S. S. M. Hassan, “Organic Analysis Using Ion Selective Electrodes”, 1982, Vols. 1&2, Academic Press, London.
J. E. W. Davies, G. J. Moody, W. M. Price, and J. D. R. Thomas, Lab. Pract., 1973, 22, 20.
J. H. Mendez, A. A. Mateos, and E. J. M. Mateos, Analyst, 1986, 111, 217.
IUPAC Analytical Chemistry Division, Commission on Analytical Nomenclature, Pure Appl. Chem., 1994, 66, 2527.
S. S. M. Hassan and M. A. Hamada, Analyst, 1988, 113, 1079.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mostafa, G.A.E. PVC Matrix Membrane Sensor for Potentiometric Determination of Cetylpyridinium Chloride. ANAL. SCI. 17, 1043–1047 (2001). https://doi.org/10.2116/analsci.17.1043
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.2116/analsci.17.1043