| Along with the development of industry, the environment pollution is gradually serious, thereinto the air pollution is one of environmental problems that caused dramatical attention. The urban atmospheric particles matters carried the various kinds of heavy metals was an important route of heavy metals' long distance migration,because atmospheric particles matters have long distance migratory property. Atmospheric particles matters contact with soils and water resources after their settlement bring pollution to ground environment. Studied the composition and content of heavy metals in atmospheric will have momentous academic and pratice significance in estimating the harm to human body,environmental quality assessment and to table a proposal of polluted airborne paticles.Cuttently, the priaery means of detection of heavy metals in atmospheric particles matters are samle digestion industively coupled plasma-atomic emission spectroscopy. However, this sample preparation method has many drawbacks, including the sample likely to be contaminated, the transfer of losses, long analysis tine and reagents, large human resource consumption.Therefore, this method can not meet the growing demand for airquality testing task. But directly introduction solid sample into instruments needs no sample preparation and detection speed, these aspects were important research content, and have not been reported by other researchers after spreading of powder samples in the traditional arc spectroscopy. The present study of direct solid sample introduction is focused on industively coupled plasma-atomic emission spectroscopy. However, the costs and useage charges of industively coupled plasma-atomic emission spectroscopy is expensive, so this method has irreparable birth defects in daily tasks of air quality testing.And now these direct solid sample introduction methods has some shortcopmings,including complex installations,non-uniform samping, low injection efficiency. There is not a sample uniform, efficient, universally accepted method of solid sampling.We had a very simple powder injetion device in this article, and achieved a good result. And we build a new detection method based on microwave plasma torch-atomic emission spectrometry, provided a reference for detection of heavy metals in atmospheric pariculate matter. The reaseach contents and conclusions were as follows:1.Briefly described the status of atmospheric aerosol pollution, the theory and status of heavy metals in atmospheric particals analysis, summarized the conventional detection methods, described the deficiencies of these methods, pointed that the analysis of airborne particles of heavy metals by microwave plasma rorch- atomicemission spectrometry using solid sampling moments is of great value. 2. Introduced testing technology and equipment of harmful heavy metals in airborne particles based on ICP-AES, focusing on the injection methods. Systematically summarized the principles, devices, applications, advantages and disadvantages of these methods.3.Describes the principle, structure and advantages of microwave plasma moments, and build the microwave plasma tube- atomic emission spectroscopy system with powder injection device, focusing on the powder injection device.4.Optimized the experimental conditions of microwave plasma tube- atomic emission spectroscopy system with powder injection device, determined the best working conditions for the instrument, and provided a good reference information for future analysis of the practical application. And then tested Hg, As, Pb in silica powder, in order to simulate the heavy metals analysis in atmospheric particles. The detection limits of Hg reaches 2.07μg/m3, the detection limits of As reaches 20.9μg/m3, the detection limits of Pb reaches 0.088μg/m3. This method is simple instrumentation, speed, and its human resource consumption is small.5. Summarized the content of this article and prospects for future research work. |
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