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作者在研究有机络合剂对铬(Ⅵ)的增感效应时发现,在空气-乙炔富燃焰中,柠檬酸、酒石酸使铬(Ⅵ)的吸光度增加20%,而柠檬酸钠、酒石酸钠、酒石酸钾钠可使铬(Ⅵ)的吸光度增加70%。同是有机络合剂,差别仅在于含钠离子与否,而对铬的增感效应的差别竟如此之大。为了解产生这种差别的原因,进一步研究了在空气-乙炔火焰中,钠离子对铬吸光度的影响。研究结果表明,钠离子不仅可使铬的吸光度增加40%以上,而且可以消除因铬的价态不同带来的测定误
In the study of the sensitizing effect of organic complexing agents to chromium (Ⅵ), citric acid and tartaric acid increased the absorbance of chromium (Ⅵ) by 20% in air-acetylene rich flame, while sodium citrate, sodium tartrate , Potassium sodium tartrate can increase the absorbance of chromium (Ⅵ) by 70%. The same is the organic complexing agent, the only difference is that with sodium ions or not, and the difference between the sensitizing effect of chromium was so great. To understand the reasons for this difference, the effect of sodium ions on the absorbance of chromium was further investigated in the air-acetylene flame. The results show that sodium ion can not only increase the absorbance of chromium by more than 40%, but also eliminate the measurement error due to the difference in the valence of chromium