水溶液中Cd~(2+)的火焰原子吸收测试条件的优化

为优化火焰原子吸收法测定水溶液中的Cd2+含量的测试条件,分别采用单因素简单比较法、正交实验设计极差分析及正交实验回归方法考察了狭缝宽度n,空心阴极灯灯电流I,燃烧器高度H以及乙炔/空气流量比P对于仪器灵敏度的影响。结果表明:狭缝宽度对灵敏度的影响最大、灯电流次之,燃烧器高度和乙炔/空气流量比的影响很小。三种方法得到的优化实验条件虽不相同,但吸光度十分接近,相互间差异小于仪器的测试误差。综合考虑仪器的稳定性、乙炔消耗量等因素,确定灵敏度最佳的火焰原子吸收实验条件为灯电流3 mA,狭缝宽度1.0 mm,燃烧器高度6 cm,乙炔/空气流量比0.167。

Cd~(2+) Testing Condition Optimization in Flame Atomic Absorption Spectrometry

In order to optimize test condition of detecting content of Cd~(2+) in water by using flame atomic absorption spectrometry,single factor comparison method,range analysis and regress analysis based on orthogonal experiment data were used to investigate the effect of width of the slit(n),lamp current(I),burner height(H) and the proportion of ethyne to air(P) on sensitivity of the instrument.The result shows that the slit width plays the most important role on the sensitivity among the four factors,and the lam...