摘要
建立了用槲皮素修饰碳糊电极测定痕量铅的新方法 ,在 0 .1 0mol L甲酸盐缓冲液 (pH 4.3 )中 ,于 -0 .1 0V(vs.SCE)搅拌富集 ,再在 -0 .70V静止还原 40s后 ,阳极化扫描 ,于 -0 .42V左右获得一灵敏的铅阳极溶出峰。在最佳条件下 ,富集不同时间 ,其二次导数峰电流与Pb2 + 在 1 .0× 1 0 - 8～ 8.0× 1 0 - 7mol L和 2 .0× 1 0 - 9～ 6.0× 1 0 - 8mol L两个范围内呈线性关系 ,检出限为 8.0× 1 0 - 1 0 mol L(S N =3 )。同时初步探讨了电极反应机理。
The voltammetric determination of trace lead was carried out at quercetin modified carbon paste electrode. Lead(II) was selectively accumulated on the electrode by the formation of the electroactive complex with quercetin in 0.10 mol/L formate buffer (pH4.3). The ensuing measurement was performed by anodic linear scan stripping voltammetry after reducing the lead(II) to metallic lead at -0.70 V for 40 s, and the second derivative peak was obtained at -0.42 V. under optimum conditions, two linear ranges were 1.0 x 10(-8) similar to 8.0 x 10(-7) mol/L with 150s accumulation time and 2.0 x 10(-9) similar to 6.0 x 10(-8) mol/L with 300s accumulation time, respectively. The detection limit was found to be 8.0 x 10(-10) mol/L with 300s accumulation time. The developed method was applied to the determination of lead in water samples with good results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2001年第8期916-918,共3页
Chinese Journal of Analytical Chemistry
