Improved electroanalytical characteristics for flumetralin determination in the presence of surface active compound.
The use of square wave voltammetry (SWV) and square wave adsorptive stripping voltammetry (SWAdSV) in conjunction with a cyclic renewable silver amalgam film electrode for the determination of flumetralin is presented. Poor separation of two overlapped reduction peaks is significantly improved when hexadecyltrimethylammonium bromide is used as a component of the supporting electrolyte solution (together with BR buffer pH 9.5). The SW technique parameters were investigated and found optimal as follows: frequency 50 Hz, amplitude 40 mV, and step potential 5 mV. Accumulation time and potential were studied to select the optimal conditions in adsorptive voltammetry. The analytical curve was linear for the flumetralin concentration range from 1.0 × 10-6to 1.0 × 10-5mol dm-3and from 5.0 × 10-9to 1.0 × 10-7mol dm-3for SWV and SWAdSV, respectively. Detection limit of 6.5 × 10-10mol dm-3was calculated for accumulation time 60 s at -0.2 V. The repeatability of the method was determined at a flumetralin concentration level equal to 5.0 × 10-9mol dm-3and expressed as %RSD = 5.0% (n= 6). The proposed method was applied and validated successfully by studying the recovery of herbicide content in spiked environmental samples.
Faculty of Chemistry, Department of Inorganic and Analytical Chemistry, University of Lodz, 92-236 Łódź, Poland.
Dariusz
0000-0002-0990-321X
D
Guziejewski
Faculty of Chemistry, Department of Inorganic and Analytical Chemistry, University of Lodz, 92-236 Łódź, Poland.
Sylwia
S
Smarzewska
Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 53210 Pardubice, Czech Republic.
Radovan
R
Metelka
Faculty of Chemistry, Department of Analytical Chemistry and Instrumental Analysis, Maria Curie-Skłodowska University, 20-031 Lublin, Poland.
Agnieszka
A
Nosal-Wiercińska
Faculty of Chemistry, Department of Inorganic and Analytical Chemistry, University of Lodz, 92-236 Łódź, Poland.
Witold
W
Ciesielski
Electrochemistry; Herbicides; Plant growth regulator; Silver amalgam film electrode; Square wave voltammetry