Determination of Twelve Major, Minor and Trace Components in Phosphate Ores by X-ray Fluorescence Spectrometry with a Lower-dilution Ratio of Fused Bead Sample Preparation

The accuracy and precision are lower, and the detection limit is higher for the determination of F with low content and low fluorescence yield by using X-ray Fluorescence Spectrometry combined with lower dilution ratio fused bead samples preparation. In this paper a method has been reported for the determination of 12 major, minor and trace elements in phosphate ores by wavelength dispersive X-ray Fluorescence Spectrometry. A lower-dilution ratio (5∶1 reagent to sample) fused bead sample preparation mix was used for measurements. Chinese National Standard Materials with similar matrix elemental compositions to the samples were used to calibrate the matrix effect with the experience coefficient method. Results show that precision and accuracy of the method are greatly improved for 12 components, with lower detection limits and satisfactory results for unknown samples. Especially, precision, accuracy and detection limit of F were better than the analytical results in literature and were obtained by using a 10∶1 fused dilution ratio. Meanwhile, this method solved the technological problem by determining the F component using a pressed pellet sample, and other major and minor components by using fused bead pellet samples. The detection limit of F was also lowered by using this method.