氮化硼修饰碳糊电极对水中铅离子的检测

Detection of Pb2+ in water by boron nitride modified carbon paste electrode

以硼酸和尿素为原料,通过高温焙烧获得了纳米片组成的花状氮化硼颗粒,并考察了该氮化硼修饰对碳糊电极溶出伏安法检测铅离子灵敏度的影响。结果显示,氮化硼修饰能够显著提高碳糊电极对铅离子的检测灵敏度。当氮化硼投加量为10%、电解质(KCl)的pH和浓度分别为2.0和0.1 mol/L,于-1.0 V电位下预富集360 s,电极有最佳的铅离子检测灵敏度。在此条件下,Pb^2+的线性范围为0.2~5 mg/L,灵敏度为17.29 mA·L/mg。

The flower-like boron nitride particles consisting of nanosheets were obtained using boric acid and urea as raw materials by high temperature calcination. The effect of boron nitride modification on the detection sensitivity of stripping voltammetry for lead ions was investigated. The results showed that boron nitride modification could significantly improve the detection sensitivity of carbon paste electrode for lead ions. When the dosage of boron nitride is 10%, pH and concentration of electrolyte(KCl) are 2.0 and 0.1 mol/L, respectively, and the pre-concentration time is 360 s at potential of-1.0 V, the electrode has the best detection sensitivity of lead ions. Under the condition, the linear range of Pb^2+ is 0.2 to 5 mg/L and the sensitivity is 17.29 mA·L/mg.