College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, P R China.
J Agric Food Chem. 2011 May 11;59(9):4418-23. doi: 10.1021/jf200288e. Epub 2011 Apr 7.
An ionic liquid n-octylpyridinium hexafluorophosphate (OPFP) modified carbon paste electrode was developed. This ionic liquid modified carbon electrode showed better electrochemical activities compared with the traditional carbon paste electrode which employed the paraffin oil as the binder. With the electrochemically deposited bismuth film, the developed electrode exhibited well-defined and separate stripping voltammetric peaks for cadmium and lead. The linear range of the bismuth film electrode was from 1.0 μg L(-1) to 100.0 μg L(-1) for both metal ions with a deposition time of 120 s and a deposition potential of -1.2 V in pH 4.5 acetate buffer solution. The detection limit was 0.10 μg L(-1) for cadmium and 0.12 μg L(-1) for lead with a deposition time of 180 s. The electrode was also applied to determine cadmium and lead in soil sample extracts. Results suggested that the proposed electrode was sensitive, reliable and effective for the determination of trace heavy metals.
研制了一种离子液体正辛基吡啶六氟磷酸盐（OPFP）修饰碳糊电极。与传统的以石蜡油为粘合剂的碳糊电极相比，这种离子液体修饰的碳电极显示出更好的电化学活性。通过电化学沉积铋膜，所开发的电极对镉和铅表现出清晰可分的溶出伏安峰。在 pH 4.5 乙酸盐缓冲溶液中，沉积时间为 120 s，沉积电位为-1.2 V 时，对于两种金属离子，铋膜电极的线性范围均为 1.0 μg L(-1)至 100.0 μg L(-1)。镉的检测限为 0.10 μg L(-1)，铅的检测限为 0.12 μg L(-1)，沉积时间为 180 s。该电极还应用于土壤样品提取物中镉和铅的测定。结果表明，该电极对于痕量重金属的测定具有较高的灵敏度、可靠性和有效性。
