CAJ | 학술논문

研究了表面活性剂存在下，Cd(Ⅱ)与2-［5-溴-2-吡啶偶氮］-5-二乙氨基苯酚(5-Br-PADAP)的显色条件.在pH=8的氨性缓冲溶液中，有OP的条件下，Cd(Ⅱ)与5-Br-PADAP形成1∶2的红色络合物.络合物的显色温度范围宽，稳定时间长，最大吸收波长在560 nm，其表观摩尔吸光系数为3.51×105 L*mol-1*cm-1.镉含量在0～400 μg/L范围符合比耳定律.该方法可用于铅渣中微量镉的测定，灵敏度高，重现性好.图1，表2，参5.
연구료표면활성제존재하，Cd(Ⅱ)여2-［5-추-2-필정우담］-5-이을안기분분(5-Br-PADAP)적현색조건.재pH=8적안성완충용액중，유OP적조건하，Cd(Ⅱ)여5-Br-PADAP형성1∶2적홍색락합물.락합물적현색온도범위관，은정시간장，최대흡수파장재560 nm，기표관마이흡광계수위3.51×105 L*mol-1*cm-1.력함량재0～400 μg/L범위부합비이정률.해방법가용우연사중미량력적측정，령민도고，중현성호.도1，표2，삼5.
The condition of colour reaction of Cadmium(Ⅱ) with 2-［(5-bromo-2-pyridyl)azo］-5-diethylaminophenol(5-Br-PADAP)in the presence of Surfactant has been studied.The Cadmium(Ⅱ) can react with 5-Br-PADAP to form 1∶2 red complex in the NH3*H2O-NH4Cl buffer solution (pH8.0) containing OP.The colour reaction can be accomplished in wide range of temperature and the colour is stable for at least 20 h.Complex has a maximum absorption wavelength at 560 nm.The apparent molar absorptivity is 3.51×105 L*mol-1*cm-1.Beer's law is obeyed in the range from 0 to 400 μg/L for Cadmium(Ⅱ).This method possesses advantages of high sensitivity and good repeatability.It is applied to the determination of trace Cadmium in lead slag with satisfactory results.1fig.,2tabs.,5refs.