Fabrication and application of a new modified electrochemical sensor using nano-silica and a newly synthesized Schiff base for simultaneous determination of Cd2+, Cu2+ and Hg2+ ions in water and some foodstuff samples

A coumarin-derived useful scaffold exhibiting Cu2+ induced fluorescence quenching and fluoride sensing (On–Off–On) via copper displacement approach

“…However, when the emission spectra of treated contaminated water samples were acquired significant fluorescence quenching occurred ( Figure S26) with naked-eye sensitive color of solutions diminished ( Figure 12A, B and C). The recovery of Cu 2+ with respect to standard calibration curve was excellent (113 to 91%) and we could able to detect 0.02 µM (1.29 ppb) Cu 2+ in real contaminated water samples ( Figure S27) which was comparable to other reported standard methods [33][34][35][36] (Table-3 ESI). Thus, it is important to mention that probe 6 can be potentially utilized to detect copper contamination in the environment with high sensitivity and selectivity.…”

Electrochemical determination of inorganic mercury and arsenic—A review

“…Mesoporous silica based carbon paste electrode was modified with thiol groups for detection of Hg(II) up to limit of detection 3µg/L with 20 min accumulation time (Yantasee et al 2003). Silica nanoparticles was used to prepare carbon paste electrode that were modified with either a derivative of 5-mercapto-1-methyltetrazole or Schiff base (Afkhami et al 2013). These modified electrodes gave limit of detection 20µg/L and 0.05µg/L respectively in real waste water samples.…”

Electrochemical nanosensors: advances and applications

“…Afkhami et al have utilized nano-silica as a means of simultaneously detecting trace levels of cadmium, copper, and mercury in a range of water and food samples. 120 Nanosilica was chosen over other nanomaterials because of its high specific surface area and its potential for high diffusion rates due to its three-dimensional structure. A Schiff base (BTPP) which could form complexes with targeted heavy metal ions was synthesized and used to easily modify the nano-silica due to an abundance of silanol groups located on the particles' internal surface allowing it to operate as an effective sorbent for heavy metals in aqueous media.…”