Voltammetric sensors of bisphenol A, uric acid, dopamine and acetaminophen using layered double hydroxide modified multiwalled carbon nanotubes paste
<p>This study aimed to develop a voltammetric sensor for the determination of bisphenol</p><p>A (BPA), uric acid (UA), dopamine (DA) and acetaminophen (ACT) using multiwalled</p><p>carbon nanotubes incorporated with zinc/aluminium...
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| Main Author: | |
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| Format: | thesis |
| Language: | chi |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=7274 |
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| Summary: | <p>This study aimed to develop a voltammetric sensor for the determination of bisphenol</p><p>A (BPA), uric acid (UA), dopamine (DA) and acetaminophen (ACT) using multiwalled</p><p>carbon nanotubes incorporated with zinc/aluminium layered double hydroxidequinmerac</p><p>(Sensor 1), zinc/aluminium layered double hydroxide-quinclorac (Sensor 2)</p><p>and zinc/aluminium layered double hydroxide-clopyralid (Sensor 3). The surface</p><p>morphological was determined using field emission scanning electron microscope. The</p><p>electrochemical properties were characterized by cyclic voltammetry, square wave</p><p>voltammetry and electrochemical impedance spectroscopy. Several experimental</p><p>variables of voltammetric analysis such as composition ratios, type of supporting</p><p>electrolyte, pH of the solution and square wave voltammetry parameters were</p><p>optimized. The effective surface area of electrodes was determined by</p><p>chronocoulometry. At the optimum conditions, Sensor 1 showed three linear ranges for</p><p>the single determination of BPA (30 to 700 nM, 1 to 10 M and 30 to 300 M) with</p><p>detection limit of 4.4 nM. Sensor 2 showed simultaneous determination of UA and</p><p>BPA. The linear ranges for UA is from 0.3 to 30 M and 50 to 100 M while for BPA</p><p>is from 0.3 to 5 M and 10 to 100 M with detection limit are 0.065 M and 0.049 M,</p><p>respectively. Sensor 3 showed simultaneous determination of DA, ACT and BPA with</p><p>linear ranges from 7 to 500 M, 30 to 500 M and 3 to 500 M and with detection limit</p><p>of 0.172 M, 0.179 M and 0.136 M, respectively. All the developed sensors did not</p><p>interfere by several foreign ions. In a conclusion, the proposed electrodes exhibited</p><p>good analytical performance with excellent sensitivity and selectivity. In its</p><p>implication, these fabricated electrodes are applicable for determination of BPA, UA,</p><p>ACT and DA in baby bottle, baby teether, water samples, urine and pharmaceutical</p><p>tablets.</p> |
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