Voltammetric determination of phenmedipham herbicide using a multiwalled carbon nanotube paste electrode
Phenmedipham is an herbicide used especially in the sugar beet harvest to
fight against broad-leaved weeds and studies of its voltammetric behavior
and detection have not been done before. The superior properties of carbon
nanotubes such as electrical conductivity, mechanical strength, and wide
potential ranges make them attractive for chemical sensors and the
phenmedipham compound gave an oxidation peak at +++1320 mV (vs. Ag/AgCl) on
the nanostructured multiwalled carbon nanotube paste electrode. Square wave
voltammetric measurements recorded for phenmedipham showed that the peak
current increased linearly between 0.02 and 2.0 mg/L with a regression
coefficient of rrr = 0.9989, and the limit of detection and limit of
quantification were calculated as 6.96 μμ\mu g/L and 23.2 μμ\mu g/L,
respectively. The applicability and the selectivity of the improved square
wave voltammetric method for the phenmedipham assay were investigated in the
presence of certain herbicides and fungicides such as carbendazim, benomyl,
aclonifen, ethofumesate, metamitron, and p-acetanisidide (methacetin).
Phenmedipham at 1 mg/L with the same amount of these pesticides was
determined to have recoveries of 103.5 ±±\pm 0.7, 94.5 ±±\pm 2.8, 104.3
±±\pm 1.8, 101.9 ±±\pm 3.1, 93.8 ±±\pm 1.7, and 101.3 ±±\pm 1.8,
respectively (n = 3). The method was also applied to the phenmedipham assay
in saturated tea sugar prepared as a spiked natural sample and 1.0 g/L
phenmedipham in the sugar solution was successfully determined with a
relative error of --5.0% and a relative standard deviation of 3.16%.
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