Determination of boron,arsenic,bromine and tungsten in geochemical samples by cation resin exchange separation-inductively coupled plasma mass spectrometry
WANG Yanchao, HE Hanjiang, LIU Jinlong, ZHANG Xia, ZHANG Chengxin
China Chemical and Mine Bureau Research Institute of Geological, Beijing 100101, China
Abstract：In the multi-objective geochemical investigation, several testing methods are involved for the determination of four elements including boron, arsenic, bromine and tungsten. The analysis cost is high, and the detection efficiency is low. The sample was treated by alkali fusion with sodium hydroxide and sodium peroxide in experiments. After extraction with ethanol and boiling water, the 732-cation resin was adopted for exchange separation, realizing the separation of sodium ions from the target elements. A method for the determination of boron, arsenic, bromine and tungsten in geochemical samples by inductively coupled plasma mass spectrometry (ICP-AES) was established. The effect of 732-cation exchange resin dosage and the adsorption time on the determination was investigated. The results showed that Na+ in solution could be controlled below 0.05 g/L when the dosage of resin was 5 g and the adsorption time was 1 h. The influence of cleaning method on the memory effect was also studied. The results showed that the memory effect could be eliminated by cleaning with 2% ammonia water for 2 min after determination. For some samples with high contents, the cleaning time could be properly increased to 3 min. Under the optimized experimental conditions, the linear correlation coefficients of calibration curves for four elements were all greater than 0.999. The limits of detection were between 0.12 and 0.60 μg/g, and the limits of quantification were between 0.41 and 1.99 μg/g. The contents of boron, arsenic, bromine and tungsten in six certified reference materials of stream sediment and soil were analyzed according to the experimental method. The logarithmic differences (ΔlgC) between the determination results and certified values were between -0.043% and 0.048%, which could meet the requirements of DZ/T 0130-2006 The specification of testing quality management for geological laboratories. The contents of boron, arsenic, bromine and tungsten in geochemical samples were determined according to the experimental method and compared with the analysis method for multi-objective geochemical investigation. The results had no significant difference. The relative standard deviations (RSD, n=12) of determination results were between 2.0% and 4.7%.
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