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Portugaliae Electrochimica Acta

versão impressa ISSN 0872-1904

Port. Electrochim. Acta v.26 n.4 Coimbra  2008

 

Glyphosate Determination in Soil, Water and Vegetables Using DPV Optimized by Response Surface Methodology

Reinaldo F. Teófilo1, Efraim L. Reis1,*, César Reis1, Gilmare A. da Silva1, José F. Paiva2 and Lauro T. Kubota3

1 Departamento de Química, Universidade Federal de Viçosa, UFV, 36570-000, Viçosa, MG, Brasil

2 Departamento de Química, Universidade Federal de Ouro Preto, UFOP, 35400-000, Ouro Preto, MG, Brasil

3Instituto de Química, Universidade Estadual de Campinas, UNICAMP, 13084-971, Campinas, SP, Brasil

 

Received 13th November 2007; accepted 19th April 2008

 

 

Abstract

A voltammetric procedure optimized by experimental design for glyphosate determination in soil, water and vegetable samples is described. The voltammetry experiments were performed using a hanging mercury drop electrode (HMDE). The DPV variables involved in the optimization process were: voltage step, pulse amplitude, pulse interval, voltage step time and concentration of the supporting electrolyte. A full 25 factorial design was chosen to evaluate these effects. From the results obtained by the factorial design the three most important factors were determined. These variables were evaluated with a central composite design. Under the optimized conditions, the operational range was from 0.050 to 100.0 mg dm-3 and the detection and quantification limits were 14 and 48 µg dm-3, respectively. The optimized method was successfully applied to glyphosate determination in soil, water and vegetables after purifying with an ion exchange resin and derivation.

 

Keywords: glyphosate, SWV, experimental design, voltammetry.

 

 

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References

1. D.D. Baird, R.P. Upchurch, W.B. Homesley, and J.E. Franz, in S.M. Carlisle and J.T. Trevors, Water Air Soil Pollut. 39 (1988) 409.        [ Links ]

2. O.P. de Amarante, T. dos Santos, N.M. Brito, and M.L. Ribeiro, Quim. Nova 25 (2002) 589.

3. M.L. Morrison and E.C. Meslow, For. Sci.30 (1984) 95.

4. J. Marsh, H.A. Davies, and E. Grossbard, Weed Res. 17 (1977) 77.

5. O.P. de Amarante, T. dos Santos, N.M. Brito, and M.L. Ribeiro, Quim. Nova 25 (2002) 420.

6. C.D. Stalikas and C.N. Konidari, J. Chromatogr. A 907 (2001) 1.

7. K. Sato, J.Y. Jin, T. Takeuchi, T. Miwa, K. Suenami, Y. Takekoshi, and S. Kanno, J. Chromatogr. A 919 (2001) 313.

8. Y. Zhu, F.F. Zhang, C.L. Tong, and W.P. Liu, J. Chromatogr. A 850 (1999) 297.

9. E. Borjesson and L. Torstensson, J. Chromatogr. A 886 (2000) 207.

10. A. Royer, S. Beguin, J.C. Tabet, S. Hulot, M.A. Reding, and P.Y. Communal, Anal. Chem.72 (2000) 3826.

11. C.D. Stalikas and G.A. Pilidis, J. Chromatogr. A 872 (2000) 215.

12. Z.H. Kudzin, D.K. Gralak, J. Drabowicz, and J. Luczak, J. Chromatogr. A 947 (2002) 129.

13. J. March, “Advanced Organic Chemistry: Reactions, Mechanisms, and Structure”, John Wiley and Sons, New York (1992).

14. W.F. Smyth, P. Watkiss, J.S. Burmicz, and H.O. Hanley, Anal. Chim. Acta 78 (1975) 81.

15. J.O. Bronstad and H.O. Friestad, Analyst 101 (1976) 820.

16. H.O. Friestad and J.O. Bronstad, J. Assoc. Off. Anal. Chem. 68 (1985) 76.

17. P. Gratteri, S. Furlanetto, E. LaPorta, S. Pinzauti, and R. Leardi, Farmaco 51 (1996) 231.

18. M.A. Alonso, S. Sanllorente, L.A. Sarabia, and M.J. Arcos, Anal. Chim. Acta 405 (2000) 123.

19. S. Furlanetto, S. Orlandini, G. Aldini, R. Gotti, E. Dreassi, and S. Pinzauti, Anal. Chim. Acta 413 (2000) 229.

20. C.F. Oduoza, Chemometrics Intell. Lab. Syst. 17 (1992) 243.

21. R.F. Teófilo, E.L. Reis, C. Reis, G.A. da Silva, and L.T. Kubota, J. Braz. Chem. Soc. 15 (2004) 865.

22. R.F. Teófilo, M.M.C. Ferreira, Quim. Nova 29 (2006) 338.

23. B.B. Neto, I.S. Scarminio, and R.E. Bruns, “Como Fazer Experimentos. Pesquisa e Desenvolvimento na Ciência e na Indústria”, Editora da Unicamp, Campinas (2001).

24. D.C. Montgomery, “Design and Analysis of Experiments”, John Wiley and Sons, New York (2001).

25. R.H. Myers and D.C. Montgomery, “Response Surface Methodology: Process and Product Optimization Using Designed Experiments”, John Wiley and Sons, New York (2002).

26. C. Burgess “Valid Analytical Methods & Procedures”, RS.C, Tyne and Wear (2000).

 

* Corresponding author. E-mail address: efraim@ufv.br

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