摘要
该文研制了1-(2-吡啶偶氮)-2-萘酚(PAN)碳糊修饰电极(CMCPE),并且建立了微分脉冲伏安法测定Co(Ⅱ)的方法。分析过程包括一在搅拌条件下开路富集步骤,然后是在0.1mol·L^(-1)NaOH溶液中将富集在电极表面的Co(Ⅱ)氧化,最后利用微分脉冲阴极伏安法获得分析峰,测定下限约为5.9×10^(-9)mol·L^(-1)。只有较少的物质如V~Ⅱ、Ce~Ⅲ、EDTA等发生干扰,这些干扰很容易消除。电极应用于人发中Co(Ⅱ)的分析。
A 1 - (2 -Pyridylazo) -2 -naphthol modified carbon paste electrode was fabricated and a differential pulse cathodic voltammetric method was developed for the sensitive and selective determination of Co (Ⅱ). The analysis procedure consisted of an open circuit accumulation step in stirred sample solution. Then the accumulated Co(Ⅱ) was oxidized and subsequently a cathodic potential scan was applied to obtain the voltmmetric peak in next solution. Of the selected substances examined for interferences, only V, Ce, EDTA interfered. These interferences could be easily eliminated. The peak current - concentration relationship linear from 2. 0 × 10-9 to 1. 0 × 10-5 mol· L-1. The detection limit is 8. 5 × 10-10 mol · L-1. The electrode was used to the determination of CoⅡ in human hair.
出处
《化学传感器》
CAS
2003年第3期42-49,共8页
Chemical Sensors
