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Preparation of Graphite Modified Electrode by Direct Electrochemical Method and Its Application for Determination of Nitrite

YU Hao1,WANG Yi1,JIAN Xuan1,LI Yan-rui2,QI Guang-cai1(1.College of Chemistry and Chemical Engineering,Yan'an University,Yan'an Shanxi 716000,China; 2.Oil Production Plant of Wangjiachuan,Yanchang Oil Field CO.LTD,Yan'an Shanxi 716000,China)  
A graphite modified glassy carbon electrode was fabricated by cyclic voltammetry and was characterized with EIS and SEM techniques.Moreover,the electrochemistry behavior of nitrite was also studied on the resulting modified electrode.The results showed that the resulting modified electrode had high electrocatalytic activity to the oxidation of nitrite.Based on this,an amperometry for determation of nitrite was established in 0.10 mol·L-1 pH 7.0 phosphate buffer solution.Under the optimum conditions,the oxidation peak current have linear relationships with concentration of nitrite over the range of 2.69×10-6~8.13×10-4 mol·L-1(r=0.999 7) and 8.13×10-4~8.56×10-3 mol·L-1(r=0.999 2) with the detection limit of 8.68×10-7 mol·L-1(3sb).The sensitivity for the determination of nitrite was 42.68 and 10.91 μA·(mmol·L-1)-1.The proposed method was applied to detect nitrite in real sample with satisfactory results.
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