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随着地球化学研究的逐步深入对痕量As、Sb、Bi、Cd及In、Ge、Tl的测定要求为10~(-5)—10~(-6)％。为此即使采用“ICP”法也很难达到这样低的检出限。 本文采用比较简单的室电极,直流电弧,以碘化钾,硫磺,焦硫酸钾,炭粉作反应剂—缓冲剂,并采用饱和的K_2S_2O_7(内含少量I_2和KI)溶液浸泡电极,减少样品蒸气向电极外壁扩散及抑制造岩元素的大量蒸发,提高被测元素灵敏度和减少Si,Mg谱线对Sb、As谱线的干扰,同时研究了在各种条件下,电弧温度与电子密度的关系,找出最佳的分
With the gradual deepening of geochemical research, the requirements for the determination of trace amounts of As, Sb, Bi, Cd, In, Ge and Tl are 10 -5 to 10 -6%. For this reason even with the “ICP” method is also very difficult to achieve such a low detection limit. In this paper, a simpler room electrode and DC arc were used to react with potassium iodide, sulfur, potassium pyrosulfate and carbonaceous powder as reactants and buffers, and the electrode was saturated with saturated K 2 S 2 O 7 solution containing a small amount of I 2 and KI to reduce the sample vapor The diffusion of the outer wall of the electrode and the massive evaporation of the rock-forming elements are suppressed, the sensitivity of the measured element is increased and the interference of the Si and Mg lines on the Sb and As lines is also reduced. Meanwhile, the relationship between the arc temperature and the electron density under various conditions is studied, Find the best score