Comprehensive sensors array recognization for the raw milk adulteration

The comprehensive sensors array was comprised of nonselective detectors and selective detectors.The nonselective detectors array consists of work electrode (such as palladium, platinum, gold, titanium, wolfram and silver electrodes) , Ag/AgCl reference electrode and platinum auxiliary electrode. The selective detectors array was composed of pH electrode, conductivity electrode and sodium ion analyzer electrode. And then established the raw milk adulteration detecting system by connected to electrochemical workstation and computer with the statistics software SPSS. The Holstein cattle raw milk, the milk samples adultered with different concenrtration of ureophil, melamine and sodium bicarbonate, aged milk, pasteurized milk, rancid milk were detected through this system with electrochemical method. The open circuit potential, ac impedance spectrascopy and differential voltammetry data was obtained by nonselective and selective detectors. Then these data were dealt with through pattern recognition methodes, and the euclidean distances between different samples with standard raw milk database. The comprehensive eucilidean distances were calculated in different statistical weight, and displayed through chart. The results showed that the nonselective sensors array had good distinguished ability to the adultered raw milk, however, the comprehensive sensors array was much better in distinguishing adulteration.