本文研究了火焰原子吸收法中有机络合剂对铬的增感效应。在空气-乙炔富燃焰中,0.5%的柠檬酸钠、酒石酸钠、酒石酸钾钠使铬的吸光度增加70%,并能消除钾、钠、钙、镍、铜、锡、锰镁的干扰。探讨了增感效应的机理,认为有机络合剂存在时,气溶胶离子的收缩效应增大、侧向扩散减少是增感的主要原因。 In this paper, the sensitizing effect of organic complexing agents to chromium in flame atomic absorption spectrometry was studied. In the air-acetylene rich flame, 0.5% sodium citrate, sodium tartrate and potassium sodium tartrate increased the absorbance of chromium by 70% and eliminated the interference of potassium, sodium, calcium, nickel, copper, tin and manganese. The mechanism of sensitization effect was discussed. It is concluded that the shrinkage effect of aerosol ions increases with the presence of organic complexing agent, and the decrease of lateral diffusion is the main reason for the sensitization.