| With an steadily increasing amount of our country zinc concentrate imports, it is urgently required ourfor finding a quick detection method to the zinc concentrate, from this, the customs passing speed of thegoods imported energy resources can be promoted. In this paper, a method of microwave digestion wasproposed, and zinc, cadmium content of import zinc concentrate were rapidly determinated by using flameatomic absorption spectrophotometry. In addition, the mercury content was tested by atomic fluorescencespectrometer. It achieve an objective that three elements of zinc, cadmium, mercury were continuouslydeterminated in same digestion solution. The sample was handle with hydrochloric acid, nitric acid,hydrogen peroxide and measured by the flame atomic absorption spectrometer under optimum condition.For another, the determination conditions were selected and the effect factors such as the deflection angle,different acids, acidity and coexisting ions on determined elements concentration were also discussed.According to the experimental conclusion, a simple, accurate, and rapid determination method wasachieved. The sample known zinc content was determined by the method. Both this method and GBmethod were used to determine samples respectively, for comparison, and the results did not showappreciable difference. The test results meet the requirements of relevant standards, and the method has theadvantages of high accuracy, simple, economic, reliable.Objective：The samples were treated with microwave digestion, and zinc, cadmium content of import zincconcentrate were rapidly determinated by using flame atomic absorption spectrophotometry. In addtion, themercury content was tested by atomic fluorescence spectrometer. It achieve an objective that threeelements of zinc, cadmium, mercury were continuously determinated in same digestion solution. Us ing thismethod, the detection rate of zinc concentrates for import and export was improved, and the customsclearances of the import and export goods were promoted.Methods：The zinc concentrate samples were treated with the acerbic system of hydrochloric acid, nitricacid and hydrogen peroxide by microwave digestion instrument. After the sample digested completely, thesolution was introduced into a flame atomic absorption spectrometer and the determination of the cadmiumcontent, zinc content was conducted, the mercury content was tested by atomic fluorescence spectrometerusing the same digestion solution. In the study, some influences such as the burner deflection Angle of theatom absorption spectrometer, reaction medium and acidity and coexisting ions on zinc, cadmiumconcentration, and the effects of negative high voltage, lamp current, furnace, carrier gas and shielding gasflow rate of atomic fluorescence spectrometer, reaction medium, acidity and coexisting ions on mercurycontent. The experiment of optimization condition has made in this study.Results: The experimental results show that the determination method achieve a character of simple,accurate, rapid. The sample known zinc content was determined by the method. Both this method and GBmethod were used to determine samples respectively, for comparison, and the results did not showappreciable difference.The measuring range, relative standard deviation, the detection limit of the method,the calibration curve and linear correlation coefficient meet the rapid detection requirements.Conclusion: In combination with other advantages of experiments in sample decomposition, by improvinginstrument conditions and controlling the experimental conditions, the speed and scope to examine thecontent of zinc, cadmium, mercury in zinc concentrates make advances. This method realized shortdigestion time, less reagent consumption, less pollution, safety and environmental protection, moreover,the volatilization of trace elements was avoided. The process of continuous determination for multielements has been realized by instrument conditions optimization and analys is of influencing factors. |
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