Abstract：The accurate determination of thallium in industrial wastewater from steel smelting is of great significance for monitoring the source of steel smelting wastewater and controlling thallium pollution. Since the content of thallium in the wastewater from steel smelting industry was usually very low and the matrix effect was significant, thallium ions were separated and enriched by solid phase extraction (SPE) using γ-aminoethyl aminopropyl trimethoxysilane(KH792) modified nano-silica as the adsorbent. 2.0 μg/L 103Rh was used as internal standard and 205Tl was selected as the detection object. A method for the determination of thallium in industrial wastewater from steel smelting by inductively coupled plasma mass spectrometry (ICP-MS) was established. The optimal SPE conditions were obtained as follows: the adsorption pH was 8.5; the adsorption time was 15 min; the sample volume was 40 mL; the adsorption rate was 1.5 mL/min; the elution was conducted with 5.0 mL of 1.0 mol/L nitric acid at rate of 0.5 mL/min; the enrichment factor was 8. Under the optimized experimental conditions, the calibration curve was plotted using mass concentration of thallium as x-coordinate and the ratio of signal intensity between thallium and internal standard as y-coordinate. The linear range for mass concentration of thallium was in range of 0.10-10.0 μg/L. The linear correlation coefficient was 0.999 9. The limit of detection was 0.002 3 μg/L, and the limit of quantification was 0.007 7 μg/L. The proposed method was applied for the determination of thallium in industrial wastewater from steel smelting. The relative standard deviations (RSD, n=7) of determination results were 0.55%-2.8%, and the recoveries were between 93% and 101%. The experimental method was applied to the determination of thallium in the simulated wastewater of steel smelting industry, and the found results were basically consistent with the theoretical values.
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