摘要
研究了新显色剂 4 - (2 -吡啶偶氮 ) -邻苯三酚 (PAPG)与 Zn( )的显色反应。在 p H =8.6的缓冲溶液中 ,该试剂与 Zn( )反应生成稳定的蓝色配合物 ,其最大吸收波长为 6 0 3nm ,对比度 10 3nm,表观摩尔吸光系数为 3.14× 10 4 L· mol- 1 · cm- 1 。Zn( )质量浓度在 0 .0 0 2～ 1.0 4 m g/ L范围内服从比耳定律。该方法应用于人发中 Zn的测定 ,同时用原子吸收法对照 。
The chromogenic reactions of a new organic reagent PAPG with Zn(Ⅱ) was thoroughly studied. At 20 ℃ and μ 0.1, PAPG reacts with Zn(Ⅱ) to form a stable,blue color,negatively charged,2∶1 complex,in the pH range 7.5 to 9.5 .The surfactants such as OP have obvious sensibilization for the chromogenic reaction,forming a ternary micell complex.The λ max of complex is 603 nm,the apparent molar absorptivities 3.14×10 4 L·mol -1 ·cm -1 . Beer ,s law is obeyed in the range of 0.002 to 1.04 mg Zn(Ⅱ) per L.Based on this ,a new method for the determination of trace amount of zinc in samples(men ,s hair) was obtained with satisfactory results.
出处
《南京工业大学学报（自然科学版）》
CAS
2002年第4期100-102,共3页
Journal of Nanjing Tech University(Natural Science Edition)
基金
南京工业大学校基金资助
