6-硝基苯并噻唑三氮烯与铜的显色反应研究——原子吸收分光光度计应用于分子吸收测定

Application of Atomic Absorpion Spectrometry to Analysis of Molecular Spectra

用原子吸收分光光度计取代可见 紫外分光光度计以Fe空心阴极灯为光源 ,测定 6 硝基苯并噻唑三氮烯与铜的显色反应 .在曲拉通X 1 0 0存在下 ,pH =1 0 .8～ 1 2 5酸度范围内 ,6 硝基苯并噻唑三氮烯与铜形成红色络合物 ,λmax=53 9.8nm ,ε表观 =1 4 6× 1 0 5L·mol- 1·cm- 1,铜含量在 0～ 60 0 μg/L范围内服从比尔定律 .应用于铝合金中铜含量的测定 ,RE为 0 4 2 % ,RSD为 1 3 % ,加标回收率为 1 0 0 4 % .

The color reaction of Cu(Ⅱ) with NBTDAB in the presence of emulsifier Triton X\|100 has been studied. The red Cu(Ⅱ) complex is formed in Na\-2B\-4O\-7\|NaOH buffer solution (pH=10.8～12.5). The maximal absorption is at 539.8 nm, with a molar absorptivity of \%ε\%\-\{539.8\}=1.46×10\+5 L\5mol\+\{-1\}\5cm\+\{-1\}. Beer's law is obeyed in the rang of (0～600 μg/L) for Cu(Ⅱ). The method has been applied to determining the trace Cu(Ⅱ) in aluminium alloy. The RE is 0.42 %, RSD is 1.3 %.The recovery is 100.4 %.