化学原子化-原子吸收光谱法测定金银花中镉含量的方法研究

Determination of cadmiumcontent in honeysuckle by chemical atomizeratomic absorption spectrophotometry

目的:采用化学原子化-原子吸收光谱法,建立金银花中重金属镉的测定方法。方法:采用PE-AA400原子吸收分光光度计,MCA-201微型化学原子化器,波长228.8 nm,狭缝2.7 mm/1.35 mm,灯电流4 mA,氩气流量为1.2 L.min-1。结果:镉浓度在0.1～8.0μg.L-1范围内,具有良好的线性关系,校准方程为A=0.1356C+0.0117(r=0.9998);方法回收率(n=9)为95.5%。结论:化学原子化-原子吸收光谱法测定金银花中痕量镉,灵敏度高,无背景影响,操作简单快速,成本低廉。

Objective： To establish a chemical atomizeratomic absorption spectrophotometry （AAS） method for deter- mination of cadmium content in honeysuckle. Methods ： The contents of cadmium were measured by PE - AA400 a- tomic absorption speetrophotometer and Mini - chemical Atomizer MCA - 201 at the wavelength of 228.8 nm. En- trance slit was 2.7 mm/1.35 ram,lamp current was 4 mA,and the flow of argon was 1.2 L · min^-1. Results：A good linear relationship was observed when he cadmium concentration ranged in 0. 1 - 8.0 p,g · mL ^- 1, with the cal- ibrator equation A = 0. 1356C ＋ 0. 0117 （ r = 0. 9998 ） ; The recovery （ n = 9 ） was 95.5%. Conclusion： The estab- lished method has a high sensitivity with no influential background, it is also easy -to -operate and with low cost.