论文部分内容阅读
目的建立微波消解-氢化物发生原子荧光光谱法测定中药材中铋的方法。方法中药材样品经硝酸-过氧化氢进行微波消解后,用氢化物发生原子荧光光谱法测定其中铋含量,并对消解条件和分析条件进行了优化选择。结果铋在2.0-40.0μg/L范围内线性关系良好,相关系数r=0.9999,方法检出限为0.208μg/L,仪器测定铋标准溶液相对标准偏差(RSD)为2.86%,国家一级标准物质茶叶(GBW07605)中铋的测定结果与标准含量一致。样品加标回收率为87.9%-93.0%,样品测定的相对标准偏差(RSD)为3.2%-8.3%。结论该方法测定中药材中的铋简便快速,灵敏度高,结果准确可靠,易于推广普及。
Objective To establish a method for the determination of bismuth in Chinese herbal medicines by microwave digestion - hydride generation atomic fluorescence spectrometry. Methods The samples of Chinese herbal medicines were subjected to microwave digestion with nitric acid-hydrogen peroxide. The contents of bismuth in the samples were determined by hydride generation atomic fluorescence spectrometry. The digestion conditions and analytical conditions were optimized. Results The linearity of bismuth in the range of 2.0-40.0 μg / L was good with a correlation coefficient of 0.9999. The detection limit was 0.208 μg / L. The relative standard deviation (RSD) of bismuth standard solution was 2.86%. The national standard Material tea (GBW07605) bismuth determination results consistent with the standard content. The recoveries of spiked samples ranged from 87.9% to 93.0%. The relative standard deviations (RSDs) of samples were 3.2% -8.3%. Conclusion The method for the determination of bismuth in Chinese herbal medicines is simple and rapid, high sensitivity, accurate and reliable, easy to popularize.