Autocatalyst Analysis Developed Standard Substances

Reference materials are used to calibrate instruments, evaluate and verify thenew technology and methods, and control the quality of analysis to ensuremeasurement results reliable. Production, determination and characterization ofreference materials play a key role in improving and maintaining the measuringsystem consistent worldwide.Reference material for automotive catalysts analysis is developed based on thecurrent market demand on this subject. It provides a basis for calibrating theinstruments, evaluating measurement methods or assigning to other materials. Thisthesis studies on composition design, preparation technology, homogeneity testing,stability testing, characterization analysis and value traceability of reference Materialsfor auto catalysts analysis.Composition design for reference material through the analysis result of autocatalysts components obtained from market is made. The suitable catalysts areprepared and mixed fully. Homogeneity and stability were tested and confirmed.Characterization analysis and value traceability are made after the materials prepared.Laser particle analyzer and energy dispersive X-ray fluorescence spectrometry(EDXRF) are used for homogeneity testing, followed by determination of Pt,Pd,Rh bycoprecipitation-inductively coupled plasma atomic emission spectrometry(ICP-AES)for homogeneity confirming. According to variance analysis, the materials arehomogeneous for Pt, Pd, Rh. The property values Pt, Pd, Rh are determined bycoprecipitation-ICP-AES for stability testing. T-testing results indicate that thewell-prepared samples stored under the normal conditions are table in the trackingexamination period. The samples are collaboratively certified by ICP-AES,spectrophotometry and flame atomic absorption spectrometry. Six-group values forPd and five-group for Pt, Rh respectively are obtained. All datas are statisticallyprocessed using outlier testing, normality tests, outlier tests between average values,accuracy testing. The certified values for Pt, Pd, Rh are obtained, and the uncertainty for Pt, Pd, Rh are evaluated.Finally, we get a sort of reference material for automotive catalyst containing Pt319.9±1.5(μg/g), Pd1150±18(μg/g), Rh225.1±9.7(μg/g), which can be used for thecurrent automotive catalyst analysis. The life time is over one year. This referencematerial can meet the demands of current domestic automobile manufacturers andsecondary resources recycling business for automotive catalyst, and it can fill thedomestic blank.