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采用HNO3/H2SO4预消解、HNO3/H2O2高压消解,硫脲-抗坏血酸预还原等手段,建立了高压消解-双道氢化物发生-原子荧光光谱同时测定苦丁茶原植物中砷和汞含量的分析方法。讨论并优化了分析测定条件,结果表明,砷和汞的线性范围分别为1.0×10-3—11.0×10-3mg.L-1和1.0×10-4—10.0×10-4mg.L-1,相关系数r分别为0.9986、0.9970,检出限分别是4.73×10-5mg.L-1和8.70×10-6mg.L-1;相对标准偏差(n=6)砷不大于4.25%,汞不大于4.92%。应用于5种苦丁茶原植物砷和汞含量的测定,该方法操作性强、用时短、灵敏度高。
High pressure digestion - double channel hydride generation - atomic fluorescence spectrometry was established for the simultaneous determination of arsenic and mercury in the original plants of Kudingcha by HNO3 / H2SO4 precondiysis, HNO3 / H2O2 high pressure digestion and thiourea - ascorbic acid prereduction. method. The analytical conditions were discussed and optimized. The results showed that the linear ranges of arsenic and mercury were 1.0 × 10-3-11.0 × 10-3mg.L-1 and 1.0 × 10-4-10.0 × 10-4mg.L-1, respectively , The correlation coefficient r were 0.9986, 0.9970, the detection limits were 4.73 × 10-5mg.L-1 and 8.70 × 10-6mg.L-1 respectively; the relative standard deviation (n = 6) was not greater than 4.25% Not more than 4.92%. It is applied to the determination of arsenic and mercury in 5 kinds of Ku Ding Cha original plants, which has the advantages of strong operability, short time-use and high sensitivity.