Determination of gallium, indium, thallium, germanium and tellurium in geological samples by inductively coupled plasma mass spectrometry with ethanol as a signal enhancer
LI Wei-liang, CHENG Xiu-hua, ZHANG Ming-zu, CHEN Lu-yang
Xi’an Center of Geological Survey, Xi’an 710054, China
Abstract：With organic reagents for sensitization, a method for the determination of gallium, indium, thallium, germanium and tellurium in geological samples by inductively coupled plasma mass spectrometry was proposed. The effect of methanol, ethanol and acetone in the concentration range of 0.5%-10% on the signal intensity of the analyte elements was investigated and the results showed that 4% ethanol had the most obvious enhancement effect on the mass spectral signal. The maximum emission power and the atomizing gas flow were established as 1 400 W and 0.8 L/min. The interferences from polyatomic and doubly charged ionic were eliminated by selection of isotopic, and the signal drift in the determination was corrected with rhodium as internal standard. The detection limits of this method were as follows: 0.023 μg/g for gallium, 0.021 μg/g for germanium, 0.012 μg/g for indium, 0.023 μg/g for tellurium, and 0.010 μg/g for thallium. The method was corroborated with rock certified reference materials GBW07103-GBW07108. The results were within the allowable error ranges of the certified values, and relative standard deviations were all less than 7.0% (n=10).
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LI Wei-liang, CHENG Xiu-hua, ZHANG Ming-zu, CHEN Lu-yang. Determination of gallium, indium, thallium, germanium and tellurium in geological samples by inductively coupled plasma mass spectrometry with ethanol as a signal enhancer. , 2014, 34(3): 13-18.
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