title: Study of the voltammetric behaviour of the ethalfluralin and methalpropalin and its determination in environmental matrices at hanging mercury drop electrode.
abstract: An electroanalytical method has been developed for the determination of the herbicides ethalfluralin[N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl) bezenamine] and methalpropalin [N-(2-methyl-2-propenyl)-2, 6-dinitro-N-propyl-4 (trifluoromethyl) benzenamine] by differential pulse adsorptive stripping voltammetry (DP-AdSV) on a hanging mercury drop electrode (HMDE) with universal buffer as supporting electrolyte. The optimum adsorption conditions were found to be pH 6.0, an accumulation potential of -0.6 V (HMDE vs SCE), an accumulation time of 80 s. and scan rate 45 mVs(-1). Calibration curve is linear in the range 1.30 x 10(-9) to 1.32 x 10(-5) M of ethalfluralin and 1.13 x 10(-5) to 2.0 x 10(-8) M of methalpropalin with detection limits of 1.08 x 10(-9) and 1.87 x 10(-8) M, respectively. The relative SD and correlation coefficients were found to be 1.24%, 0.998 and 1.34%, 0.995, respectively for ten replicates. The method is applied to the determination of the ethalfluralin and methalpropalin in formulations and environmental matrices.
authors.affiliation: Electroanalytical Labs, Department of Chemistry, Sri Venkateswara University, Tirupati,, 517 502, Andhra Pradesh, India.
authors.forename: T
authors.initials: T
authors.lastname: Thriveni
authors.forename: J Rajesh
authors.initials: JR
authors.lastname: Kumar
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Lee
authors.forename: N Y
authors.initials: NY
authors.lastname: Sreedhar
mesh_terms: D000588:Amines / Q000737:chemistry*; D028464:Cucurbita / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D004785:Environmental Pollutants / Q000737:chemistry; D005464:Fluorobenzenes / Q000737:chemistry*; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007194:India; D008628:Mercury / Q000737:chemistry*; D015394:Molecular Structure; D014274:Trifluralin / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D000588:Amines; D004785:Environmental Pollutants; D005464:Fluorobenzenes; D006540:Herbicides; C044697:benzotrifluoride; C027392:ethafluralin; D014274:Trifluralin; D008628:Mercury