Abstract:
Arsenic, one of nature's most prevalent environmental toxins, was found to be
exceedingly abundant in the Earth's mantle during this thesis. Arsenic can manifest in
various oxidation states (-3, 0, +3, and +5), with arsenite (As
3+
) being particularly toxic
in natural water and surface soil. The extended presence of arsenic in these environments
posed a significant risk to human well-being. Recognizing the critical importance of an
effective sensing technique for the detection of As
3+
ions, this study aimed to safeguard
human health and well-being while preserving a beautiful and healthy biosphere.
The advantages of electrochemical sensing, such as easy instrumentation, high sensitivity,
strong selectivity, mobility, and on-site analysis capability, were considered. A
Nanocomposite Cu-Fe/GA@NS-rGO was synthesized to detect very low levels of As
3+
in
water and achieve sensitivity up to 0.7 nM. The morphological and physicochemical
characteristics of the synthesized material were investigated through Fourier-transform
infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The electrochemical behavior of
the Pencil graphite electrode (PGE) modified with Cu-Fe/GA@NS-rGO was examined using
cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).
It was demonstrated that, with the Cu-Fe/GA@NS-rGO/PGE, As
3+
could be sensed via
differential pulse voltammetry (DPV). As the concentration increased from 10 to 80 nM,
a substantial linear response was achieved, with a limit of detection of 0.7 nM. The
remarkable sensitivity of the Cu-Fe/GA@NS-rGO-modified PGE underscored its
electroanalytical capabilities, suggesting its practical applicability in its as-prepared state
for real-world scenarios.
