Study on Short Term Stability Ability of XRF Determination of Nine Oxides in Cement
X-ray fluorescence analysis can achieve a wide range of linear detection of oxides in portland cement,and can avoid the problem that the concentration of titration and spectrophotometry will be far away from Lambert Beer's law when the concentration is large.However,with the continuation of the detection time in the actual detection,it is found that the short-term stability of the XRF method for detection of different oxides is different.Based on the method in GB/T176,the range of the mass fraction fluctuation range measured in a short time is between 0.02%～0.43%,and the mass fraction fluctuation range of CaO is as high as 0.43%,and the minimum fluctuation range of TiO2 is 0.02%.At the same time,the maximum value of RSDMAX of the results of a single test of each oxide is 5.20%for Na2O and 0.10%for CaO.Through comprehensive analysis of the mass fraction range of the nine oxides in general portland cement,it is found that the XRF method has the best measurement accuracy and stability for Fe2O3,MgO,Al2O3,and TiO2 in cement.In addition,it is particularly important to pay attention to the stability of the alkali content test results and use standard samples to verify the accuracy of the results.
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