Abstract：The composition of coal is complicated. The content of cadmium in coal is low, and it is easily volatile. According to these characteristics, the coal was firstly pretreated by oxygen plasma low temperature ashing. Then, the palladium nitrate was added as matrix modifier to make cadmium form non-dissociative substance in ashing process. The determination method of cadmium in coal by graphite furnace atomic absorption spectrometry(GFAAS) with slurry sampling was established. The influence of sample matrix was mainly studied. The samples before and after low temperature ashing were compared and analyzed. The results indicated that the analytical sensitivity and precision could be significantly improved by low temperature ashing treatment. The ashing temperature and atomization temperature of slurry sample and the dosage of matrix modifier were optimized. The ashing temperature and atomization temperature was 650 ℃ and 2 200 ℃, respectively. The optimal mass concentration of matrix modifier (i.e., palladium nitrate) was 1.0 g/L. Under the optimized conditions, the standard slurry sample showed good linear in range of 0.1-2.0 μg/L for cadmium. The linear correlation coefficient was 0.999 5. The detection limit was 0.012 mg/kg. The actual sample and certified reference material of coal were analyzed according to the experimental method. The relative standard deviation (RSD, n=5) was between 2.9% and 5.9%. The found results were consistent with those obtained by airtight digestion method or the certified values.
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LONG An-ying, LIU Quan-heng, WU Sheng-jin, WANG Shi-kui, LI Yue. Determination of cadmium in coal by low temperature ashing-slurry sampling graphite furnace atomic absorption spectrometry. , 2016, 36(4): 28-33.
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