Reagent Free Electrochemical-Based Detection of Silver Ions at Interdigitated Micro Electrodes Using in Situ pH Control
semanticscholar(2020)
摘要
Silver ions, the most toxic
form of silver, can be present in drinking water due to their release from
silver nanoparticles which are widely used in consumer products. Due to their
adverse health effects, a quick portable approach for detection in drinking
water is needed. Herein we report on the development of an electrochemical
sensor for silver ions detection in tap water using linear sweep voltammetry
with in situ pH control; enabled by closely space interdigitated electrode
arrays. The in situ pH control approach, allows the pH of a test solution to be
tailored to pH 3 thereby eliminating the current need for acid addition. A
calibration curve between 0.2 - 10 µM was established for silver detection in
sodium acetate when 1.25 V and 1.65 V was applied at the protonator electrode
during deposition and stripping, respectively, as a proof of concept study. For
the final application in tap water, 1.65 V was applied at the protonator
electrode during deposition and stripping. The chlorine ions, present in tap
water as a consequence of the disinfection process, facilitated the silver
detection and no additional electrolyte had to be added. Combination of
complexation of silver ions with chlorine coupled with in situ pH control resulted
in linear calibration range between 0.25 and 2 µM in tap water without the need
for acidification.
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