Imidacloprid (IMI) is a systemic insecticide, which is
widely used
for seed treatment and pest control in vegetables. The unwarranted
presence of traces of IMI in vegetables and groundwater is a matter
of grave concern which needs to be detected and quantified in order
to effect remedial measures for the sake of food safety. In this work,
we communicate the fabrication of tungsten sulfide (WS2) nanosheets and the construction of an amperometric sensor for the
precise determination of IMI. The sensor performances were evaluated
by using cyclic voltammetry (CV). The presence of surface-active sites
and the fast electron transfer on WS2/GCE favored the electrochemical
reduction of the aromatic nitro group in IMI. The developed IMI sensor
displayed a linear range of IMI detection from 10 to 90 μM with
a detection limit of 0.28 μM. The developed WS2/GCE
sensor also displayed good sensitivity, with a value of 3.98 μA
μM–1 cm–2. The electrochemical
measurements demonstrated the superior selectivity of the constructed
WS2/GCE sensor for IMI detection, which makes it suitable
for practical applications.
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