Design Of Multifunctional Liquid Phase Microextraction Based On S3C2440

There are some steps of sample preparation (extraction, purification, concentration) and analysis detection (identification, examination and content determination) should be performed for the analysis of target compounds in complex samples. With the development of computer technology, information technology and instrumentation technology, detection techniques and analysis methods were greatly promoted. So, there are many kinds of high sensitive and high selective detection method. However, the pretreatment technology of sample preparation can’t adapt to the development of analytical determination technology, which becomes the bottleneck of the analysis of target compounds in complex samples. Developing a sample separation, purification and concentration technology has become necessary and key problem of the target compounds in complex sample. The technology should not only can retain and extract the determination components, but also can remove the non measured ingredients relatively completely. In addition, it should have the characteristics of fast, simple, environmental friendly, high concentration ratio and can meet the requirements of detection technology. In order to develop a rapid, simple, economic, environmental friendly, automated sample preparation instruments, this dissertation studied and developed a multi-functional liquid phase microextraction system based on gas purge microsyringe extraction technique.Firstly, the embedded ARM9processor was selected for core control device and LCD module HCR50HD-SV2was selected for man-machine interface. Considering we haven’t transplanted the OS, software was developed under Windows ADS1.2environment.Secondly, this paper designed data acquisition circuits including a detection circuit of heating temperature, condensation temperature and actuator control circuit including driving circuit of heating, condensation, flow controller, fan control circuit and power supply circuit. Besides, a fuzzy-PID control algorithm was designed and tested by combining fuzzy control algorithm ideas and traditional PID control method. Test results showed that the temperature control in the50～350℃could get satisfactory control effect and could meet the system indicators.Finally,18kinds of poly cyclic aromatic hydrocarbons standard mixtures were extracted separately by the system of this paper and HS-SD-LPME technique whose extraction mechanism is similar to the system of this paper.The experimental results show that the recovery rate of this system exceeds80%and shows better extraction performance. Moreover, compared with the HS-SD-LPME technology, the system has higher recovery rate and gets the ability to extract volatile and semi volatile chemicals simultaneously and has the characteristics of simple operation and quick extraction.