Carbon nanotube composite PVC coated stainless steel disc electrode for detection of Ga(III) |
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Authors: | Abdolkarim Abbaspour Hamed Valizadeh Ehsan Mirahmadi |
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Affiliation: | 1. Chemistry Department , College of Sciences, Shiraz University , Shiraz, 7145685464 , Iran abbaspour@chem.susc.ac.ir;3. Chemistry Department , College of Sciences, Shiraz University , Shiraz, 7145685464 , Iran |
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Abstract: | This study demonstrates the application of the composite of multi-walled carbon nanotube polyvinylchloride (MWCNT-PVC) based on Bismarck Brown R for gallium sensor. MWCNT has a role to enhance the hydrophobicity of the membrane, which leads to a more stable potential signal. In addition by applying polypyrrol on the surface of this sensor a reduction in the drift of potential occurred and equilibrium potential was achieved faster. Compared to previous studies, using a stainless steel disc instead of a wire electrode causes to obtain an easily and more homogeneous coated electrode. The sensor shows a good Nernstian slope of 19.70?±?0.37?mV?decade?1 in a wide linear range concentration of 1.0?×?10?7 to 1.0?×?10?2?M of Ga(NO3)3. The detection limit of this electrode was 7.7?×?10?8?M of Ga(NO3)3. This proposed sensor is applicable in a wide pH range of 2 to 8. It has a short response time of about 8?s and has a good selectivity over twenty four various metal ions. The practical analytical utility of this electrode is demonstrated by measurement of Ga(III) in rock and different water samples. |
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Keywords: | sensor ion selective electrode Ga(III) MWCNT polypyrrol Bismarck Brown R coated disk electrode |
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