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Determination of Major Elements in Sepoilite by Inductively Coupled Plasma-Optical Emission Spectrometry with Opening Acid Dissolution

Authors :
WANG Li-qiang
WANG Jia-song
XU Tie-min
WU Liang-ying
ZENG Jiang-ping
ZHENG Zhi-kang
WEI Shuang
Source :
Yankuang ceshi, Vol 39, Iss 3, Pp 391-397 (2020)
Publication Year :
2020
Publisher :
Science Press, PR China, 2020.

Abstract

BACKGROUND Sepiolite is a widely used fibrous magnesium-rich silicate clay mineral. Sepiolite is mainly composed of silicon and magnesium, with minor aluminum, potassium, sodium and other impurities. Determination of the major element of sepiolite usually adopts the classical chemical analytical method. After the alkali melting treatment, the sample is determined by volumetric method, photometry and atomic absorption spectrometry, which is inefficient and time-consuming. Moreover, potassium and sodium cannot be simultaneously determined. OBJECTIVES To find an efficient method for the determination of seven major elements in sepiolite. METHODS The samples were digested by hydrofluoric acid, nitric acid, and perchloric acid. Contents of major elements such as Al2O3 were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES). The dosage of hydrofluoric acid was optimized. The analytical spectral lines were Al 396.153nm, Ti 334.940nm, K 766.490nm, Na 589.592nm, Ca 422.673nm, Mg 285.213nm and Fe 238.204nm, and elements were determined by axial observation. The content of magnesium in sepiolite was high, and there was a certain matrix effect during ICP-OES analysis. A series of high magnesium mixed standard solutions were prepared to match the matrix. RESULTS The linear correlation coefficient of the standard curve of each element was greater than 0.9990, the detection limits of the method were 0.53-3.25μg/g, the relative standard deviations (RSD, n=10) of the measured results were 0.66%-5.65%, and the recoveries of each element were 95.3%-108.5%. CONCLUSIONS Acid dissolution is easy to operate compared with the alkali fusion method. The results are consistent with those obtained by classical chemical analytical methods and thus meet the analytical requirements of sepiolite samples.

Details

Language :
English, Chinese
ISSN :
02545357 and 20190603
Volume :
39
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Yankuang ceshi
Publication Type :
Academic Journal
Accession number :
edsdoj.0924c9cfe394c66bf17ac5db92274f8
Document Type :
article
Full Text :
https://doi.org/10.15898/j.cnki.11-2131/td.201906030079