Abstract
A new method for the rapid and sensitive determination of trace quantities of thiocyanate based on its Landolt effect on the bromate-hydrochloric acid reaction was developed. The induction period of the reaction is proportional to the SCN– concentration. The decolorization of methyl orange by the reaction products was used to monitor the reaction spectrophotometrically at 525 nm. We were able to determine thiocyanate in the range 2 × 10–7–4 × 10–5 M by this method. The relative standard deviation for 10 determinations of 1.5 × 10–6 M thiocyanate ion is 0.19% and the detection limit of the method was 7.00 × 10–8 M. The method was applied to the determination of thiocyanate in human blood serum and of saliva samples with satisfactory results.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
Densen, P.M., Davidow, B., Bass, H.E., and Jones, E.W., Arch. Environ. Health, 1967, vol. 14, p. 865.
Butts, W.C., Kuehneman, M., and Widdowson, G.M., Clin. Chem. (Washington, D.C.), 1974, vol. 20, p. 1344.
Bendtsen, A.B. and Hansen, E.H., Analyst (London), 1991, vol. 116, p. 647.
Giorgio, N., Anal. Chem., 1975, vol. 47, p. 763.
Michalski, E. and Wtorkowska, A., Chem. Anal. (Warsaw), 1961, vol. 6, p. 365.
Zhdanov, A.K., Akhmedov, G., and Vyssh, M.M., Khim. Khim. Tekhnol., 1972, vol. 15, p. 503.
Danchick, R. and Boltz, D., Anal. Chem., 1968, vol. 40, p. 2215.
Chattaraj, S. and Arabinda, K.D., Spectrochim. Acta, Part B, 1992, vol. 47, p. 675.
Giogio, N., J. Chromatogr., 1973, vol. 84, p. 37.
Koichi, F., Minoru, T., and Toshiyuki, S., Anal. Chem., 1981, vol. 53, p. 1377.
Woronski, M., Chem. Anal. (Warsaw), 1969, vol. 14, p. 1183.
Yasuyski, M. and Tomazo, K., Bull. Chem. Soc. Jpn., 1986, vol. 59, p. 741.
Yadvendra, K. and Prashanl, N., Analyst (London), 1987, vol. 112, p. 1767.
Afkhami, A. and Bahrami, H., Anal. Lett., 1995, vol. 28(10), p. 1785.
Ensafi, A.A., Tajebakhsh-E-Ardakany, J., Anal. Lett., 1995, vol. 28, p. 731
Ghasemi, J., Amini, R., and Afkhami, A., Anal. Sci., 2001, vol. 17, p. 435.
Perez-Bendito, D. and Silva, M., Kinetic Methods in Analytical Chemistry, Chichester: Ellis Horwood, 1988, 1st ed.
Landolt, H., Ber. Deut. Chem. Ges., 1886, vol. 19, p. 1317.
Colorimetric Determination of Nonmetals, Boltz, D.F. and Howell, J.A., Eds., New York: Wiley, 1978.
Linares, P., Luque de Castro, M.D., and Volcarcel, M., Analyst (London), 1986, vol. 111, p. 1405.
Afkhami, A., Safavi, A., and Massoumi, A., Talanta, 1992, vol. 39, p. 993.
Safavi, A., Afkhami, A., and Massoumi, A., Microchem. J., 1995, vol. 52, p. 3.
Gradwohl, R.B.H., Clinical Laboratory Methods and Diagnosis, St. Louis, MO, 1956, part 1, 5th ed., p. 510.
Van Staden, J.F. and Botha, A., Anal. Chim. Acta, 2000, vol. 403, p. 279.
Koh, T., Yonemura, Y., and Kanai, H., Bull. Chem. Soc. Jpn., 1992, vol. 65, p. 3153.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tayyebeh Madrakian, Akram Esmaeili & Azizeh Abdolmaleki Kinetic-Spectrophotometric Determination of Trace Quantities of Thiocyanate Based on Its Landolt Effect on the Reaction of Bromate with Hydrochloric Acid1 . Journal of Analytical Chemistry 59, 28–32 (2004). https://doi.org/10.1023/B:JANC.0000011664.22353.e3
Issue Date:
DOI: https://doi.org/10.1023/B:JANC.0000011664.22353.e3