%0 Journal Article
%T Determination of Melamine in Fresh Milk by Electrochemistry with Solid Phase Microextraction at Bismuthyl Chloride Modified Graphite Epoxy Composite Electrode
%A Yongchun Zhu
%A Yanjia Zhang
%A Jingyi Li
%A Yanli Han
%A Guobin Dong
%A Hongbo Zhang
%J American Journal of Analytical Chemistry
%P 612-618
%@ 2156-8278
%D 2011
%I Scientific Research Publishing
%R 10.4236/ajac.2011.25069
%X Melamine as an important chemical raw material and a harmful additive in foods has attracted many people¡¯s attention. In the present paper, The graphite-epoxy composited solid phase electrode was modified with bismuth layer by cyclic voltammetric deposition of bismuth from Bi(NO3)3 aqueous solution including 0.10 M HNO3, and hydrolyzed into micro bismuthyl chloride on-sites. Melamine in fresh milk was extracted with solid phase micro-extraction on the bismuthyl chloride modified graphite-epoxy composited solid electrode. The adsorption of melamine on bismuthyl chloride particle surfaces follows a Freundlich adsorption model, and results in the decrease of the reduction peak current of bismuth in bismuthyl chloride, and determined by differential pulse voltammetry from fresh milk in a larger concentration range of 10¨C4 ? 10¨C12 M with detection limit of 2.5 ? 10¨C12 M and relative standard deviation of 2.7%. The method is sensitive, convenient and was applied in the detection of melamine in fresh milk with relative deviation of 4.2% in content of 0.45 mg/kg melamine in the fresh milk.
%K Melamine
%K Bismuthyl Chloride Modified Electrode
%K Adsorption
%K Differential Pulse Voltammetry
%K Solid Phase Micro Extraction
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=7302