IR micro-imaging technology is a new kind of analytical technology, which combines direct-visualizing image and infrared spectroscopy analysis. Each pixel in the IR micro-image is a whole IR spectrum, therefore, IR micro-image contains not only the information of spatial distribution but also the information of spectrum with hundreds of wavelength points. In this study, the feasibility of using IR micro-imaging to detect cypermethrin on the surface of apple skin was discussed, both cypermethrin single substance powder and the apple skin that was sprayed with cypermethrin single substance solution were used as research objects, IR micro-image and infrared spectrum were all analyzed. The results showed that IR micro-image of cypermethrin single substance powder could effectively reflect the information of spatial distribution, and the characteristic peak corresponding to molecular structure of cypermethrin could also be observed in the IR spectrum which extracted from IR micro-image of cypermethrin single substance powder. In the infrared spectrum of the apple skin that sprayed with cypermethrin single substance solution, four characteristic absorption peaks corresponding to cypermethrin which were located at 1591 cm-1, 1489 cm-1, 1290 cm-1and 801 cm-1were observed, which confirmed that there was cypermethrin existed on the apple skin. The present study indicated that the detection of cypermethrin on the surface of apply by IR micro-imaging technology was feasible, which provided a good foundation for the detection of fruit and vegetable pesticide residues by IR micro-imaging technology.

A Gram positive bacterium strain 12-3 for degrading DDT effectively was isolated from the DDT contaminated site of the shipyard in Guangzhou by enrichment culture, which could utilize DDT as the sole carbon source for growth. This strain was identified as Pseudomonas species. Based on the phenotype, physiological and biochemical identification, and fatty acids identification. Testing theirs DDT degradation rate with HPLC, the results showed that in a shaky flask containing 20 mg/L DDT, this strain could degrade DDT with degradation efficiency of 51.6% in 8 days at 30°C, pH 8.0.

Animal facilities produce large amounts of harmful gases, and many of them have a pungent odor such as ammonia, hydrogen sulfide and other malodorous gases. The malodorous gases generated by animal house not only affect the health of people and livestock but also pollute the air. The detection of the malodorous gases can effectively improve efficiency of livestock production and reduce environmental pollution. More and more gas detection method is applied to the detection of the malodorous gases generated by animal house. This paper summarizes contact sensors for monitoring of malodorous gases in animal house recently, including semiconductor sensors electrochemical sensors and electronic nose. The basic principle and the characteristics of these methods were illustrated and the applications on the detection of malodorous gases in animal house were described. Meanwhile, the researches of malodorous gases monitoring for livestock production applied contact sensors were listed. The status quo and future development of the contact sensors for malodorous gases generated by animal house were summarized.

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