Biuck HABIBI
,
Mehri ABAZARI
,
Mohammad Hossien POURNAGHI-AZAR
催化学报
doi:10.1016/S1872-2067(11)60438-5
A simple and sensitive electrochemical detection of caffeine (CAF) using a single-walled carbon nanotubes on carbon-ceramic electrode (SWCNT/CCE) is reported. CAF was oxidized at the surface of the modified electrode to produce an anodic peak at 1.38 V versus the saturated calomel electrode in 0.01 mol/L, pH 1.7 H2SO4 solution in cyclic voltammetry. The experimental parameters, namely, type of electrolyte, pH value, and amount of SWCNTs casted, were optimized. Using the optimum conditions, the anodic peak current in differential pulse voltammetry was linear with CAF concentration in the range of 2.5×10-7-1.0×10-4 mol/L. The detection limit was 1.2×10-7 mol/L (S/N=3). The modified electrode exhibited good stability and can be easily regenerated. The relative standard deviation of the peak current obtained for a 5.0×10-5 mol/L CAF solution was 3.0%. The influence of some important biological compounds, namely, ascorbic acid, do-pamine, and uric acid and addictive compounds like codeine, morphine, and acetaminophen on the CAF anodic peak current was examined. The method was successfully applied for the determination of CAF in some practical samples.
关键词:
caffeine
,
electrocatalysis
,
electrochemical determination
,
single-walled carbon nanotube
,
carbon-ceramic electrode
唐荣
,
钱言
,
秦品珠
,
干方群
,
程婷
,
崔皓
材料导报
doi:10.11896/j.issn.1005-023X.2016.12.025
亚硝酸盐是水中最常见的污染物之一,其检测长期以来一直是国内外研究的热点问题.制备了聚苯胺载银修饰玻碳电极(Ag/PANI/GCE)并将其应用于水中亚硝酸根的电化学检测.初步研究了亚硝酸根在电极表面的电化学行为的影响因素,并分析了所制备电极材料检测亚硝酸根的灵敏度、稳定性以及抗干扰性能.结果显示,所制备的Ag/PANI/GCE电极材料的电化学稳定性好,可以对水中的亚硝酸根浓度进行有效的检测,同时具有稳定性好、灵敏度较高、抗干扰性能强等优势,具有较高的研究价值和较好的应用前景.
关键词:
聚苯胺
,
纳米银
,
亚硝酸根
,
电化学检测
