Detect The Heavy Metal Elements Of Biological By LIBS

Element is divided into macro elements and trace elements, many of trace elements are closely related with huaman’s health and disease, immunity and infection, reproductive and teratogenic, cancer and carcinogenesis, nutrition and longevity, growth and disorders and other chronic diseases. The deficiency or excess of trace elements will disrupt the balance of the body, causing diseases. In the former, the method of analysis elements is atomic fluorescence spectrometry, atomic absorption spectrometry, biological detection.The methods of former must have a sample processing, and the process is complex, can’t realize rapid, real-time, non-destructive test. Therefore, it is necessary to develop a new technology to realize the analysis the elements on line. The laser-induced breakdown spectroscopy detection technology(LIBS) refers to a beam of high intensity laser pulses through lens focused onto the sample, and then produced plasma spectroscopy, which is collected by spectrometer and detection system, and then qualitative and quantitative analysis of the elements. The equipment is simple, doesn’t require tedious sample pretreatment, and can test all samples, high sensitivity, and can be rapid, real-time, non-contact remote detection is widely used in the industry, the pollution of the environment, heritage protection, biomedicine, deep space exploration and other fields.This paper firstly summarizes LIBS technology, discussed the concept of plasma, plasma formation mechanism and LIBS advantages and disadvantages. Then analysis the research of abroad and home. Summarize the plasma radiation mechanism in detail. This paper introduces a set of LIBS system, introduces the system device function, and optimizes the experimental parameters, summed up the experimental optimum parameters, for each sample, the parameters such as the laser pulse energy, delay time are different. Before experiment, we should set the optimum experimental parameters. In the experiment, the sample is on the step motor for moving, the sample include lead worker’s nail, the fish and so on. The laser focus on the sample, and the plasma spectroscopy acquisition, realize online analysis of LIBS. Then analysis the element’s spectroscopy, through calibrate the elementMg、Pb、Ba and so on, also analyze the detection limit of the element, at the same time diagnose the plasma temperature and election density,at last analyze the error of data and its reason.The conclusion sums up the main contents of this article, points out the innovation and deficiency, and puts forward solutions.