Application Study Of X-Ray Fluorescence Analysis Technology In Element Of Heavy Metals Analysis In Soil

The paper topic selection comes from “863Project” resources subject “High-Precision X-Ray Fluorescence Detection Instruments Research”(Project Number:2012AA06180301). Due to rapid development of social and economic, so we can livein the achievements of industrial civilization today, and no concern to theenvironment problem has become key factors to harm our quality of life.For the moment, soil environmental pollution has become the most attentionamong the many problems of environmental pollution. The source of soil is humanresources, all kinds of resources needed for daily life can without soil.The quality ofSoil environmental is not only concerns the growth and the environment quality of allkinds of plants and animals, but also is closely related to human body health. So theresearch on the main causes of heavy metal polluting soil is a very urgent researchdirection.For the moment, The research of heavy metal element in soil is divided into twocategories: one is the restoration of heavy metal pollution in soil; Another is analysisof the heavy metal element in soil. Research of heavy metal pollution for soil is theprecondition for the repair of soil conditions, Only figure out the real situation ofheavy metal contaminated soil, The corresponding repair measures can are putforward. In real conditions, the commonly used analysis methods are: AFS, AAS, UV,XRF, ICP, ICP-MS.In this paper, using the wavelength dispersive X-ray fluorescence spectrumdetection technology to build the systemic analysis method of X-ray fluorescencespectrometric on farmland soil heavy metal. This paper discusses about the accuratemeasurement of X-ray fluorescence spectrum analysis all kinds of influence factorsand the corresponding correction methods, on the commodity grain production area ofsouth on behalf of the area of southwestern city, east China, south China city andother places of the urban-rural fringe farmland soil samples. The achievements of thisstudy are as follows:（1）This paper introduces X-ray fluorescence analysis of latest research achievements in the field of application. Discussed about in the field of soil heavymetal detection X fluorescence analysis the present situation of the application ofdetection technology and the main problems currently. Using X-ray fluorescencespectrum detection technology is presented in this system to detect method of soilheavy metals.（2）Research instruments and sample processing various aspects achieve theoptimization of conditions, such as the choice of experimental apparatus of highvoltage, electric current; Correction Angle, deducting background; Determine themeasurement of time. Greatly influenced to The results of the analysis by the labsample preparation conditions of saturated thickness and compactness. Through theexperiment, and the optimization of each element measuring conditions forexperimental apparatus: through the experiment in sample preparation As below15Mpa pressure count rate and quality of the samples, in this case the quality of thesample is only reached more than4g, to reach saturated thickness; When thethickness of the specimen is saturated by experiment As the count rate and samplepreparation of the relationship between the pressure, in this case the system pressureis reached more than15Mpa its minimal impact. The optimum test conditions for soilsample: after drying, production15Mpa pressure, thickness of saturated-samplequality more than4g.（3）By X-ray fluorescence spectrometry, using the theory of alpha factorcorrection matrix effect to build work curve for correcting Cu, Cr, Ni, Zn, As, Pbelements. The correction factor for each element: Cr of SiO2alpha coefficient is0.3112, of Fe2O3alpha coefficient is0.2711, the CaO alpha coefficient is3.1803; Niof Fe2O3alpha coefficient is0.7443, the CaO alpha coefficient is0.1252; Cu ofFe2O3alpha coefficient is0.8223, the CaO alpha coefficient is0.2943; Pb of Fe2O3alpha coefficient is0.5052, the CaO alpha coefficient is0.1167; Zinc of Fe2O3alphacoefficient is0.63, the CaO alpha coefficient is0.1153; As for Pb overlap interferencefactor correction coefficient of0.295285. Alpha coefficient is0.0001, of Fe2O3forCaO alpha coefficient is0.0001.（4）Evaluation of the accuracy and precision of X fluorescence spectrometry, toverify this method detection limit. Method the precision of relative standard deviation(RSD) were less than6.2%, the method of the accuracy of the relative error is lessthan3.09%, reduce the instrument measuring the detection limit of each element,make its between0.9to2.0.（5）Using the X-ray fluorescence spectrum analysis model is detected heavy metals in farmland soil of the Integration of urban and rural areas in three areas. Theexperimental results show that heavy metal pollution situation of urban-rural fringe isintensifying, and Its pollution level varies with the development of industry. theIntegration of urban and rural areas in three areas of heavy metal pollution is notserious, it under control. Because of differences in survey area, the relative contents offarmland soil heavy metal is higher in east China area, south China is relatively better,southwestern area content value is near the background value. The experimentalresults show that X fluorescence spectrum analysis method is used to detect thecontent of soil heavy metal is appropriate.