کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1695356 | 1519111 | 2012 | 4 صفحه PDF | دانلود رایگان |
Modified montmorillonite (MMT)-modified expanded graphite electrode (EGE) was used as an amperometric sensor for o-aminophenol determination. The electrochemical behavior of o-aminophenol on the electrodes EGE, MMT-modified EGE and modified MMT-modified EGE was investigated. The response of o-aminophenol was noticeably improved with the modified MMT-modified EGE, which was attributed to the higher accumulation efficiency of modified MMT. The effect of the concentration of the supporting electrolyte was examined, and 0.5 M H2SO4 was finally employed. The calibration curve was linear for o-aminophenol concentrations from 1 to 100 μM (r = 0.9978) and from 100 to 1000 μM (r = 0.9984). The detection limit was as low as 0.5 μM (S/N = 3).
► A sensitive o-aminophenol sensor based on modified MMT-modified EGE was developed.
► The amperometric sensor greatly improved the oxidation signal of o-aminophenol.
► The enhanced response is attributed to the higher adsorption ability of modified MMT.
Journal: Applied Clay Science - Volume 55, January 2012, Pages 173–176