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目的:采用正交试验设计确定最佳消解条件,采用原子吸收光谱法(AAS)测定红花中铬的含量,为制定微量元素的限度标准提供试验依据。方法:L9(34)正交试验设计优化微波消解条件,用石墨炉法(GF-AAS)测定铬。结果:最佳消解条件是酸体系为硝酸-盐酸(6∶2),最高消解温度185℃,持续25 min;测定15批红花的铬含量差异较大。15批红花中铬含量在0.53~88.15 mg·kg-1范围内,平均回收率为97.1%,RSD为2.2%(n=9)。结论:本文方法简单、准确,专属性强,可用于红花中铬元素的质量控制。
OBJECTIVE: To determine the best digestion conditions by orthogonal experimental design and determine the chromium content in safflower by atomic absorption spectrometry (AAS), providing the experimental basis for the development of the limit standard of trace elements. Methods: L9 (34) orthogonal design was used to optimize the conditions of microwave digestion. Chromium was determined by graphite furnace method (GF-AAS). Results: The best digestion conditions were nitric acid - hydrochloric acid (6: 2), the highest digestion temperature was 185 ℃ for 25 min, and the contents of chromium in 15 batches of safflower were significantly different. The average chromium recovery of 15 batches of safflower was 0.53 ~ 88.15 mg · kg-1, with an average recovery of 97.1% and a RSD of 2.2% (n = 9). Conclusion: The method is simple, accurate and specific. It can be used for the quality control of chromium in safflower.