Abstract
A carbon paste electrode incorporating silica (Si-MCPE) was fabricated to accumulate Metamitron at the electrode surface. Several electroanalytical techniques were used to explore its reductive behaviour. The results indicate that the system is irreversible and fundamentally controlled by adsorption. The adsorptive stripping response has been evaluated with respect to accumulation time, deposition potential, scan rate, pH and other variables, using differential pulse voltammetry (DPV) and square wave voltammetry (SWV) as redissolution techniques. In both cases a voltammetric peak is obtained, at −0.542 V (DPV) and −0.421 V (SWV) in Britton-Robinson buffer (pH 1.9). The detection limits were 3.66 × 10−1 M and 4.22 × 10−9 M for AdS-DPV and AdS-SWV, respectively. Under optimum conditions the Metamitron reduction peak gave two linear regions in the range from 4.0 × 10−9 M to 8.0 × 10−8 M by means of AdS-DPV, with a coefficient of variation of 2.19% (n = 10) for 1 × 10−8 M herbicide solution. A method was developed for determination of Metamitron in soils, with a recovery of 98.8% and a coefficient of variation of 5.26% (0.01 μg/g of soil).
Similar content being viewed by others
References
W. F. Smyth,Polarography of Molecules of Biological Significance, Academic Press, London, 1979.
M. R. Smyth, J. F. Vos,Analytical Voltammetry, in:Comprehensive Analytical Chemistry, Vol. XXVII, Elsevier, Amsterdam, 1992.
M. R. Smyth, W. F. Smyth,Analyst 1978,103, 529.
R. W. Murray, A. G. Ewing, R. A. Durst,Anal. Chem. 1987,59, 379A.
K. Kalcher,Electroanalysis 1990,2, 419.
K. Kalcher, J. M. Kauffman, J. Wang, I. Švancara, K. Vytras, C. Neuhold, Z. Yang,Electroanalysis 1995,7, 5.
K. Ravichandran, R. P. Baldwin,J. Electroanal. Chem. 1981,126, 293.
R. B. Geerdink,J. Chromatogr. 1991,543, 244.
H. Diekmann, R. Kreuzig, M. Bahadir,Fresenius J. Anal. Chem. 1994,348, 749.
J. F. Arranz, A. Goicolea, R. J. Barrio, A. Arranz,Fresenius J. Anal. Chem. 1989,333, 218.
A. Goicolea, R. J. Barrio, J. F. Arranz, A. Arranz,Ann. Quim. 1989,85B, 183.
A. Goicolea, J. F. Arranz, R. J. Barrio,Ann. Quim. 1991,87, 163.
A. Goicolea, J. F. Arranz, R. J. Barrio, Z. Gómez de Balugera,Fresenius J. Anal. Chem. 1991,339, 166.
C. Olmedo, L. Deban, D. Vázquez, R. Pardo, S. Palmero,Electroanalysis 1994,6, 694.
E. Laviron,J. Electroanal. Chem. 1980,112, 1.
A. Streitwieser, C. H. Heathcock,Química Orgánica, 3rd Ed., Interamericana, McGraw Hill, Madrid, 1986, p. 1251.
P. Zuman,The Elucidation of Organic Electrode Processes, Academic Press, New York, 1969.
V. D. Parker, in:Organic Electrochemistry (M. M. Baizer, ed.), Marcel Dekker, New York, 1973, p. 509.
W. F. Smyth,Voltammetric Determination of Molecules of Biological Significance. Wiley, Chichester, 1992, p. 49.
M. Viscontini, H. Bühler,Helv. Chim. Acta 1966,49, 2524.
L. Meites,Polarographic Techniques, 2nd Ed., Wiley Interscience, New York, 1965, p. 140.
J. C. Miller, J. N. Miller,Statistics for Analytical Chemistry, 2nd Ed., Ellis Horwood, Chichester, 1988, p. 103.
R. Von Burg, M. R. Greenwood, in:Metals and their Compounds in the Environment (E. Merian ed.), VCH, Weinheim, 1991, p. 1045.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Arranz, A., de Betoño, S.F., Moreda, J.M. et al. Preconcentration and voltammetric determination of the herbicide metamitron with a silica-modified carbon paste electrode. Mikrochim Acta 127, 273–279 (1997). https://doi.org/10.1007/BF01242735
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01242735