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Lu S.-S.,Zhanjiang Enter Exit Inspection and Quarantine Bureau | Xu J.-L.,Zhanjiang Enter Exit Inspection and Quarantine Bureau | Qu Q.,Zhanjiang Enter Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The determination method of 14 components (including TFe, CaO, SiO2, MgO, Al2O3, MnO, TiO2, K2O, Na2O, Ni, Cu, Co, P and S) in iron ore by X-ray fluorescence spectrometry (XRF) with fusion sample preparation was established. The optimal flux for the decomposition of iron ore was mixed flux [m(Li2B4O7):m(LiBO2)=67:33] with dilution ratio of 1:20.The sample was pre-oxidized at 700 ℃ for 10 min. The problem of measurement strength decrease of low content elements and light elements caused by flux could be well solved. The matrix effect and spectral overlapping interference could be effectively eliminated after the use of theoretical α coefficient method and empirical coefficient method correction. The root mean square (RMS) of calibration curve after correction was small. The detection limits of testing components were between 0.61 μg/g and 335.09 μg/g. The precision test of iron ore sample was also conducted. The relative standard deviations (RSD) were between 0 and 8.7%. The certified reference material of iron ore was analyzed according to the experimental method, and the found results of each component were consistent with the certified values. Compared to other XRF methods for the analysis of iron ore, the proposed method was applicable for the determination of Co, Ni and Cu, and also Na and S which were difficult to be accurately determined. Moreover, it could meet the requirements of inspection efficiency and accuracy for import and export commodities. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved. Source


LU S.-S.,Zhanjiang Enter Exit Inspection and Quarantine Bureau | Xu J.-L.,Zhanjiang Enter Exit Inspection and Quarantine Bureau | Tian Q.,Zhanjiang Enter Exit Inspection and Quarantine Bureau | Hong W.-X.,Zhanjiang Enter Exit Inspection and Quarantine Bureau | Shi Y.-X.,Zhanjiang Enter Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2014

Ten components in limestone (CaO, SiO2, MgO, Fe2O3, Al2O3, MnO, TiO2, K2O, Na2O, SrO) were determined by X-ray fluorescence spectrometry with pressed powder pellet. Through experiment, it was determined that the sample should be prepared under the pressure of 30 t with 3.00 g of limestone sample, whose granularity was below 74 μm. It was found that, by using boric acid for edge and substrate during sample pressing, the sample bonding problem could be solved without bonding agent; By using empirical α coefficient method for correcting matrix effect, the dispersion of the calibration curve after correction was relatively small, which indicated the interference from overlapping lines was effectively eliminated. The detection limit of the testing components was in the range of 0.47-188.08 μg/g. Precision test was conducted on limestone sample. The relative standard deviation (RSD) was within 0.042%-5.7%. The limestone certified reference material was analyzed by the proposed method, and the results were consistent with the certified values. The proposed method could satisfy the requirements for efficiency and accuracy of entry-exit inspection. Source

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