Determination of iron in low-iron quartz sand by high resolution continuum source graphite furnace atomic absorption spectrometry
ZHANG Liping1,2,3, YAO Mingxing*1,2,3, ZHANG Hongli1,2,3, XIAO Fang1,2,3, NI Wenshan1,2,3
1. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou 450006, China; 2. National Engineering Research Center for Comprehensive Utilization of Non-Metallic Mineral Resources, Zhengzhou 450006, China; 3. Key Laboratory for Polymetallic Ore Evaluation and Utilization, MNR, Zhengzhou 450006, China
Abstract：The development of innovative application technology of low-iron quartz resources required the accurate determination of iron content which was the key element affecting its quality. The sample was presoaked in 15 mL of hydrofluoric acid and 2 mL of nitric acid at 150 ℃ for 2 hours. Then 2 mL of perchloric acid was added for open acid digestion at 180 ℃. Finally, the extraction was conducted with 1 mL of nitric acid and 1 mL of water. The content of iron in the sample solution was determined by high resolution continuum source graphite furnace atomic absorption spectrometer at 248.327 nm. A method for determination of trace impurity iron in low-iron quartz sand was established. The experimental conditions including sample dissolution method, temperature program of graphite furnace, atomization reading time and effective pixels were optimized. The results showed that when the mass concentration of iron was in range of 20-100 ng/mL, the determination coefficient of the calibration curve equation between absorbance and mass fraction fitted by the least square method was up to 0.999 8. The limit of detection of method was 0.002 49 μg/g, and the limit of quantification was 0.007 47 μg/g. The content of impurity iron in eight low-iron quartz samples was determined according to the experimental method. The results were basically consistent with those obtained by inductively coupled plasma mass spectrometry. The relative standard deviation (RSD, n=5) of determination results were between 2.2% and 4.8%. The standard solution of iron was added for recovery tests. The recoveries were between 90% and 110%, which could meet the requirements of recovery in the national geological and mineral industry standard of DZ/T0130-2006.
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