Flow-injection determination of nitrites based on their reaction with thiocyanates
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Abstract
A technique for the flow-injection determination of nitrites with spectrophotometric signal detection was developed and studied. Additionally, a combination of the developed technique with the on-line pre-concentration of low concentrations of nitrites in surface and potable waters was investigated. The technique is based on the reaction of nitrites with thiocyanates. The product of the analytical reaction (nitroso-S-thiocyanate) and its adducts with strong acids are stable in aqueous solutions, which is supported by quantum chemical calculations. It is shown that the reaction chosen is attractive for analytical applications, because it is highly selective. A decrease in the detection limit down to 1.5 ng/mL (3s) is achieved by combining FIA with on-line ion-exchange preconcentration. The technique developed is used for monitoring nitrites in natural and waste water. The throughput capacity is 300 samples per hour.
Keywords
Aqueous Solution Waste Water Detection Limit Adduct NitritePreview
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REFERENCES
- 1.Fox, J.B., CRC Crit. Rev. Anal. Chem., 1985, vol. 15, no.3, p. 283.Google Scholar
- 2.Moorcroft, M.J., Davis, J., and Compton, R.G., Talanta, 2001, vol. 54, no.5, p. 785.Google Scholar
- 3.Bogdanovskii, G.A., Khimicheskaya ekologiya (Chemical Ecology), Moscow: Mosk. Gos. Univ., 1994, p. 101.Google Scholar
- 4.Cerda, A., Oms, M.T., Forteza, R., and Cerda, V., Anal. Chim. Acta, 1998, vol. 371, no.1, p. 63.Google Scholar
- 5.Galhardo, C.X. and Masini, J.C., Anal. Chim. Acta, 2001, vol. 438, nos.1–2, p. 39.Google Scholar
- 6.Ahmed, M.J., Stalikas, C.D., and Tzouwara-Karayanni, S.M., Talanta, 1996, vol. 43, no.7, p. 1009.Google Scholar
- 7.Mousavi, M.F., Jabbari, A., and Nouroozi, S., Talanta, 1998, vol. 45, no.6, p. 1247.Google Scholar
- 8.Kadowaki, R., Nakano, S., and Kawashima, T., Talanta, 1999, vol. 48, no.1, p. 103.Google Scholar
- 9.Xuan-Feng Yue, Zhi-Qi Zhang, and Hong-Tao Yan, Talanta, 2004, vol. 62, no.1, p. 97.Google Scholar
- 10.Monser, L., Sadok, S., Greenway, G.M., et al., Talanta, 2002, vol. 57, no.3, p. 511.Google Scholar
- 11.Fernandez-Arguelles, M.T., Canabate, B., Costa-Fernandez, J.M., et al., Talanta, 2004, vol. 62, no.5, p. 991.Google Scholar
- 12.Guerrero, R.S., Benito, C.G., and Calatayud, J.M., Talanta, 1996, vol. 43, no.2, p. 239.Google Scholar
- 13.Mikuška, P. and Večeřa, Z., Anal. Chim. Acta, 2003, vol. 495, nos.1–2, p. 225.Google Scholar
- 14.Jianhong Pei and Xiao-Yuan Li, Talanta, 2000, vol. 51, no.6, p. 1107.Google Scholar
- 15.daRocha, J.R.C., Angnes, L., Bertolli, M., et al., Anal. Chim. Acta, 2002, vol. 452, no.1, p. 23.Google Scholar
- 16.Horita, K., Wang, G., and Satake, M., Anal. Chim. Acta, 1997, vol. 350, nos.1–2, p. 295.Google Scholar
- 17.Arce, L., Kuban, P., Rios, A., et al., Anal. Chim. Acta, 1999, vol. 390, nos.1–3, p. 39.Google Scholar
- 18.Kreshkov, A.P., Osnovy analiticheskoi khimii (Fundamentals of Analytical Chemistry), Moscow: Khimiya, 1976.Google Scholar
- 19.Khimiya psevdogalogenidov (Chemistry of Pseudohalides) Golub, A.M., Keler, Ch., and Skopenko, V.V., Eds., Kiev: Vishcha Shkola, 1981, p. 161.Google Scholar
- 20.Sverdlova, O.V., Elektronnye spektry v organicheskoi khimii (Electronic Spectra in Organic Chemistry), Leningrad: Khimiya, 1985.Google Scholar
- 21.Quantitative Trace Analysis of Biological Materials, McKenzic, H.A. and Smythe, L.E., Eds., Amsterdam: Elsevier, 1988, p. 524.Google Scholar
- 22.Saldadze, K.M., Pashkov, A.B., and Titov, V.S., Ionoobmennye vysokomolekulyarnye soedineniya (High-Molecular Ion Exchangers), Moscow, 1960.Google Scholar
- 23.Kokotov, Yu.A., Ionity i ionnyi obmen (Ionites and Ion Exchange), Moscow: Nauka, 1980, p. 78.Google Scholar