Study On The Energy Dispersive X-ray Fluorescence Spectronmeter Field Testing Techniques Such As Iron And Copper, Cobalt Etc

According to the geological samples of dandong Kuandian area in the contentof Fe, Cu, Co, select the18elements to be determined the distribution gradient ofsamples forlaboratory setting, and the laboratory test of TFe2O3by chemicalmethod, ICP test using Cu, ICP-MS test using Co. For the indoor laboratoryrequirements, mainly to test the rate to the base factors in a sample, under itsinfluence, if not matching standard sample obtained by calibration test and samplematrix enough, testing data issued by XRF questionable. The Fe contents of18samples is in the range of3.42%-62.27, the content of Cu is14.1μ g/g-14654μg/g, content of Co is3.6μ g/g-555μ g/g, with its national standard substanceGBW07301-GBW07312,GBW07103-GBW07114,GBW07120-GBW07122,GBW07401-GBWGBW07408,GBW07423,GBW07424,GBW07426-GBW07430,GBW07145-GBW07149,GBWO7283and other common to build the method of curveand curve correction. Through the experiment, in the indoor laboratory establishedin accordance with the geological characteristics of samples of target zone of smallbenchtop energy dispersive X ray fluorescence spectrometer (EDXRF) testingmethod, the method of sample prepared by direct powder method, matrix correctionby empirical coefficient method, at the same time, in order to make the test resultsmore accurate, and convenient for off-line processing test data, the least squaremethod to set up the measurement value and the final value of the relationship between reported a regression equation, correlation coefficient of regressionequation in more than0.998. The precision of the method (RSD%) Fe, Cu below2.02%, the precision of Co is low, below9%, the detection limit of the instrumentsoftware method, respectively, Fe4.4μ g/g, Cu0.6μ g/g, Co0.8μg/g.Theinstrument error and sample error inspection, found that the sample error andits value can be approximately equal to the sample preparation andthe test errorand sample preparation process, has a great influence on the testresults. Indoor method of building is completed, we will this method transplanted tothe field flowlaboratory application. In view of the small benchtop energydispersive X ray fluorescence spectrometer on the test environment andsample requirements,lease container transformation of the housing as alaboratory work, interiorpartition is divided into two parts, as part of a testinstrument and sample preparation for use, with table and installation of airconditioning; another part ofthe drying box, storage samples and regulated powersupply test etc.. The core samples collected, using SP-60×100jawcrusher crushing to the particle size of less than6mm, then MP-Φ175discgrinder for crushing, crushing particle sizereached about60, then F×-8closedautomatic splitter sample division, divisionlevel is1/4, the division of samples bySZ-100high-speed vibration grinding machine for crushing, finally get the sample ofabout200meshes. Will be brokeninto200orders of the sample is placed in the drying oven is, in the condition of90℃, drying for2hours,then in accordance withthe indoor laboratory samplepreparation method of the sample. In the field of mobilelaboratory environment,we on123samples of Fe, Cu, Co three elements were testedand analyzed, with the external laboratory (TFe2O3by chemical method usingICP test, Cu test, ICP-MS test using Co) that provides results, this method of Fe, therelative error ofthe test data of Cu the relative external laboratory test data indicatethat most is in5%the following, Fe Cu, test the effect is ideal; and for Co test, therelative error can sometimes reach50%or more, can only be used as semiquantitative results.