Comparison of Two Different Sample Digestion Methods for Determination of Tungsten, Molybdenum, and Bismuth in Polymetallic Ore by Inductively Coupled Plasma-Optical Emission Spectrometry

DANG Ming-ming; YANG Ping; LEI Yong; WEN Zhi-min; ZHANG Bi-lan

doi:10.15898/j.cnki.11-2131/td.202103050032

2021 Vol. 40, No. 4

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DANG Ming-ming, YANG Ping, LEI Yong, WEN Zhi-min, ZHANG Bi-lan. Comparison of Two Different Sample Digestion Methods for Determination of Tungsten, Molybdenum, and Bismuth in Polymetallic Ore by Inductively Coupled Plasma-Optical Emission Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(4): 603-611. doi: 10.15898/j.cnki.11-2131/td.202103050032

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DANG Ming-ming, YANG Ping, LEI Yong, WEN Zhi-min, ZHANG Bi-lan. Comparison of Two Different Sample Digestion Methods for Determination of Tungsten, Molybdenum, and Bismuth in Polymetallic Ore by Inductively Coupled Plasma-Optical Emission Spectrometry[J]. Rock and Mineral Analysis, 2021, 40(4): 603-611. doi: 10.15898/j.cnki.11-2131/td.202103050032

Comparison of Two Different Sample Digestion Methods for Determination of Tungsten, Molybdenum, and Bismuth in Polymetallic Ore by Inductively Coupled Plasma-Optical Emission Spectrometry

1.
Department of Resources and Environment, Hunan Nonferrous Metals Vocational and Technical College, Zhuzhou 412000, China
2.
Quality Testing Center, Hunan Shizhuyuan Nonferrous Metals Co., LTD, Chenzhou 423037, China

More Information

Corresponding author: YANG Ping, 2424705729@qq.com

Received Date: 05 March 2021

Revised Date: 23 April 2021

Accepted Date: 17 May 2021

Publish Date: 28 July 2021

Abstract

Abstract

BACKGROUND
Currently, tungsten, molybdenum, and bismuth contents are mainly determined by the traditional potassium thiocyanate colorimetric method and EDTA volumetric method. These methods are based on single-element analysis, which has a complicated operation process, low analysis efficiency, and long detection cycle. It is difficult to meet the requirements of accurate and rapid determination of many samples.
OBJECTIVES
To improve the traditional single-element analysis method for the determination of tungsten, molybdenum, and bismuth in polymetallic ore.
METHODS
A rapid method for the simultaneous determination of tungsten, molybdenum, and bismuth in the ore sample was developed by comparing the two digestion methods of HCl-H₃PO₄-HClO₄-HNO₃ and HCl-HClO₄-HNO₃, and was subsequently combined with inductively coupled plasma-optical emission spectrometry.
RESULTS
Tungsten, molybdenum, and bismuth in the sample were digested more thoroughly using the four-acid digestion method with a reasonable addition of phosphoric acid. The relative error between the determined and certified values of each element ranged from -5.36% to -1.39%, which indicated higher accuracy. The relative standard deviation was ≤ 4.18%, and the detection limits of the method ranged from 0.0027% to 0.0037%. The method was employed for the analysis of actual samples of the polymetallic ore from a certain area in Chenzhou, Hunan Province. The recovery of each element ranged from 95.0% to 103.0%. All the technical indexes were better than those of the three-acid digestion method.
CONCLUSIONS
The developed method significantly improved the analysis efficiency and gave accurate and reliable results. The method has been verified by actual samples and is suitable for batch detection of tungsten, molybdenum, bismuth, and other major and trace elements in the polymetallic ore samples.
- polymetallic associated ore /
- four-acid digestion /
- three-acid digestion /
- inductively coupled plasma-optical emission spectrometry /
- tungsten /
- molybdenum /
- bismuth

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References

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