Determination of Copper, Lead, and Zinc in Rock Samples by Flame Atomic Absorption Spectrometry
This paper mainly studies the determination of copper, lead, and zinc in rock samples by flame atomic absorp-tion spectrometry. The pre-treatment method using a graphite digestion instrument and HF-HCl-HNO3-HClO4 acid system to digest samples has relatively good results. The acidic medium can be hydrochloric acid or nitric acid solution, and the concentration should be 2％ to 5％. According to the experiment, the detection limits for copper, lead, and zinc are 0.012 μg/mL,0.057 μg/mL,0.009 μg/mL, with lower limit of 0.048 μg/mL,0.228 μg/mL,0.036 μg/mL, the RSD value (precision) of the method is in the range of 1.0％～3.6％, and the spiked recovery is in the range of 97.29％～101.0％, meeting the requirements of rock and mineral analysis specifications. The method for the determination of copper, lead, and zinc by flame atomic absorption spectrometry has the characteristics of simple operation, short experimental time, less interference, and good accuracy and precision.
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