影响石墨炉中特征量的某些因素研究

原子吸收光谱分析发展过程中,绝对分析一直是人们所期望解决的问题。Slavin等发展的稳温平台石墨炉(STPF),以及测量积分吸光度,为绝对分析提供了有效的实验技术条件。L′vov等首先从理论上计算了元素特征量。Frech等曾指出石墨炉沿管长的温度梯度是限制绝对分析的一个重要因素。张展霞等考虑塞曼效应计算了一些元素的特征量理论值,Co、Cr和V的特征量实验值与理论值之比大于L′vov的结果。本文采用3种不同

Study on Factors Influencing Characteristic Mass in Graphite Furnace Atomic Absorption Spectrometry

Measurements of characteristic masses for Ag, Cd, Cr, Ga, Ge and In have been made over broad temperature intervals. The experimental results show that the values of m0 have appeared to be better than 10% -15% when the analytes are atomized in temperature intervals studied. Influences of atomization temperatures on the ratio m0[cmlc.]/m0[exp.] were studied when the analytes were e-vaporated from the wall, using the platform and the V-shaped boat techniques. For Ag and Cd the ratio m0[calc.]m0[exp.] does not change significantly in the temperature intervals studied. However, for the remaining four elements (Cr, Ga, Ge, In) the ratio m0[calc]/m0[exp] varies with temperature. The ratio m0[calc]m0[exp] of In or Ge was increased obviously in the presence of matrix modifier.