摘要
Abstract
[Objective] The aim was to explore the affecting factors for the digestion of soil heavy metal Pb.[Method] The absorbance trend within the area was expressed by change of two-dimensional planar contour for the first time.We used Minitab 16 software to analyze the test results by range and variance method.[Result] The factors affecting Pb digestion was in order of HF,HNO3,HClO4,gas flow,HCl,assistant gas flow,lamp current and combustion height.Test results showed that after adding 9 mL HNO3,5 mL HF and 3 mL HClO4 in soil samples,and microwave digestion,the working conditions of atomic absorption spectrophotometer were as followed: Pb wavelength 217.0 nm,slit width 1.3 nm,burner height 4 nm,assistant combustion gas rate 2.4 L/min,the lamp current 4.0 mA,and propane flow rate 4.0 L/min.Under the above optimal conditions,the optimal absorbance value was 0.302.[Conclusion] The results provide theoretical basis for precisely determining absorbance values of heavy metals in soil.关键词
混合正交优化/极差分析/方差分析/重金属/PbKey words
Mixed orthogonal optimization/Range method/Variance method/Heavy metal/Pb分类
资源环境
