石英管原子捕集技术的机理探讨

本文通过制作等浓度曲线。气流曲线、测得最大吸光区在石英管上部、与国外文献报道一致.以Ag、Cu、Au为例,研究各种测定条件,探讨了石英管原子捕集的干扰。试液0.5ppm,捕集时间2分钟时,测定出Ag的特征浓度为0.0019ppm;试液4ppb,捕集10分钟时,特征浓度为0.3ppb,比Lau报道的要出3倍,捕集0.01ppm Au,10分钟时,特征浓度为0.9ppb。本法直接测定选用锅炉水和地球化学标准样GSD-1中的Ag,得到满意结果;直接测定B165流纹斑岩矿和B161花岗岩矿中的Au,出峰明显,为原子吸收直接测定金提供了一个有发展前途的方法。

Investigation on the Technique of Trapping Atoms (in Quartz Tube)

By making use of experimental data to plot out the iso-intensity graph and the atom gas-flow graph, one can ascertain that the maximum light absorp tion zone takes it's site at the upper portion of the quartz tube. This infer- ence validates the conclusion in Reference Literature (1) . Experiments on Ag and Au have been conducted, and the interference that should stem from the trapping of atoms in the quartz tube have been investigated, in order to make sure of what technical condition that must be earned for satisfactory results. A characteristic concentration of 0.019 ppm (solution 0.5 ppm, duration of trapping 2 minutes)and a characteristic concentration of 0.3 ppb for Ag samples( solution 4ppb, duration of trapping 10 minutes) have been achieved with the outcome about three folds higher than that which was repor- ted in Reference Literature(1) , Furthermore, a characteristic concentration of 0.9ppb was achieved from trapping the atoms of Au for 10 minutes, This technique can be directly employed with satisfaction for determination of Ag in medical water boilors or in various minerals. Clear peaks could be seen when the measurement was done for determination of Au content in the B155 mineral and the B161 mineral, This up-to-date technique is undoubtedly worthy of further development.