铋电极差分脉冲伏安法测定水中痕量2,4-二硝基苯肼

以自制铋电极作为工作电极，建立了铋电极差分脉冲伏安法测定2，4-二硝基苯肼的分析方法。实验结果表明：以0.1 mol/L NaOH+0.1 mol/L KCl混合溶液（pH=13.0）配制测定底液，在扫描速率为100 mV/s的条件下，2，4-二硝基苯肼于-0.53 V处产生灵敏的氧化峰;在2，4-二硝基苯肼浓度为3.0×10-8~1.0×10-5 mol/L范围内，空白和试样的氧化峰电流强度差值与对应2，4-二硝基苯肼浓度的对数呈良好的线性关系，检出限达8.37×10-9 mol/L;将该方法应用于工业废水中痕量2，4-二硝基苯肼的检测，回收率为95.6%~103.1%，相对标准偏差小于3%。

Determination of Trace 2,4-Dinitrophenylhydrazine by Differential Pulse Voltammetry with Bismuth Electrode

The differential pulse voltammetry method for determination of 2，4-dinitrophenylhydrazine was established using the self-made bismuth electrode as working electrode. The experimental results show that：When the mixed solution with 0.1 mol/L NaOH and 0.1 mol/L KCl (pH=13.0) is used as substrate solution and the scanning rate is 100 mV/s，a sensitive oxidation peak of 2，4-dinitrophenylhydrazine is appeared at -0.53 V;When the concentration of 2，4-dinitrophenylhydrazine is 3.0×10-8-1.0×10-5 mol/L，the difference of peak current intensity between the blank and the sample has a linear relationship with the logarithmic value of 2，4-dinitrophenylhydrazine concentration，and the detection limit is 8.37×10-9 mol/L;When trace 2，4-dinitrophenylhydrazine in the industrial wastewater is determined by this method，the recovery rate is 95.6%-103.1%，the relative standard deviation is less than 3%.