Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (1): 10201-010201.doi: 10.11889/j.0253-3219.2016.hjs.39.010201

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Rapid determination of platinum and rhodium in Pt-Rh alloy by wavelength dispersive X-ray fluorescence spectrometry

WANG Guangxi1, GE Liangquan1, LUO Lianghong2, LI Dan1, LAI Wanchang1, CHEN Cheng1   

  1. 1 College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China;
    2 CDGM Glass Co., Ltd., Chengdu 610100, China
  • Received:2015-11-25 Revised:2015-12-15 Online:2016-01-10 Published:2016-01-14
  • Supported by:

    Supported by Sichuan Provincial Department of Education Natural Science Key Project (No.15ZA0070), National 863 Project (No.2012AA061803),National Natural Science Foundation of China (No.41574128)

Abstract:

Background: Pt-Rh alloy is widely used in industry. Therefore, it is of importance to determine the content of platinum and rhodium in Pt-Rh alloy rapidly. Purpose: This study aim is to establish a rapid and accurate analysis method for the Pt-Rh alloy measurement. Methods: Wavelength dispersive X-ray fluorescence (XRF) spectrometry was applied to the measurement of platinum and rhodium in Pt-Rh alloy by setting 60 kV, 50 mA as excitation conditions, and using 100 μm brass filter, 300 μm pitch collimator, PX10 analyzer crystal and scintillation detector to measure Lα line of Pt and Kα line of Rh for analysis. In order to eliminate interference caused by sample cup mask, collimator mask of 27 mm in diameter were taken for measurement. The empirical coefficient method was used to correct matrix effect and set up calibration curves of Pt and Rh. Results: The calibration curves have better linear correlations and less K and RMS (Root Mean Square) values. The experimental results show that the relative errors of Pt and Rh are less than 0.09% and 0.54%, the relative standard deviations are 0.11% and 0.17% (n=10), and the detection limits are 208 μg·g-1 and 37 μg·g-1, respectively. The measurement time of one single sample is only 74 s. The relative errors of Pt and Rh in preparation of Pt-Rh alloy measured by this method contrast the formula values are less than 0.06% and 0.20%, respectively. The contents of Rh in samples of diluting and smelting Pt-Rh alloy are measured. Compared with the calculated value, the relative error is less than 0.29%. Conclusion: This method can meet the demand of analyzing large quantities of Pt-Rh alloy samples and provide accurate and reliable scientific data for production practice.

Key words: Wavelength dispersive X-ray fluorescence spectrometry, Pt-Rh alloy, Matrix effect

CLC Number: 

  • TL99