Research Of The Rapid Determination Technology For Environmental Monitoring And Food Safety

The rapid determination technology for environmental monitoring and food safety is a very important technical support of the environment protection and food safety plan. It is also significance to the sustainable development and people's health. This research was financial supported by the key project"Rapid Screening Instrument of Pesticide Residue in Vegetables and Fruits", from National Ministry of Science and Technology. The rapid determination technology for environmental monitoring and food safety was systematically studied in this paper. The major contents and conclusions of this research were presented as following:1. Sub-critical Water Extraction (SbWE), a simple and efficient pretreatment technique, was studied as a green extraction method of environment and food samples. SbWE was firstly used as a rapid on-site pretreatment method for food safety. The formaldehyde, sodium formaldehyde sulfoxylate and pesticide residue of methamidophos in food samples were extracted efficiently. The results showed that SbWE technique has the advantages of simple, rapid, efficient and green. Based on the research of SbWE, the miniature sub-critical water extractor for rapid determination was developed.2. The portable multi-channel spectrometer with multi-sample simultaneous measurement function was studied in this research. System-on-a-Chip (SoC) technique was firstly used in the development of portable intelligent analyzer to replace the traditional system-on-a-board design. By using SoC, the structure of a spectrometer was simplified. SoC not only enhanced the stability and reliability of the spectrometer, but also reduced the hardware cost. With the simple structure, small outline and friendly interface, this spectrometer is particularly suitable for the rapid determination of environment monitoring and food safety.3. New algorithms for the rapid determination of environment monitoring and food safety were studied in this research. Automatic screening algorithm of abnormal data for linear regression calculation, improved algorithm for kinetic analysis and temperature calibration algorithm for enzyme analysis were successfully used in the portable spectrometer.4. More than ten kinds of chemical reagent kits for rapid determination of environment monitoring and food safety coupled with the portable spectrometer were studied, such as Cr(VI), Pb, Cd, NO2-, ,NO3-, formaldehyde, sodium formaldehyde sulfoxylate, COD, NH4+, PO43+, CN-, F, Cl2, etc. The analytical characteristics of these chemical reagent kits, such as accuracy, precision and linearity, were compared with standard laboratory methods.5. The integration of SbWE pretreatment technique, portable multi-channel spectrometer and chemical reagent kits for rapid determination of environment monitoring and food safety was realized. A integrated technique for rapid determination of environment monitoring and food safety was provided based on the portable multi-sample & multi-parameter rapid analyzer.