锌(Ⅱ)-2-(5-溴-2-吡啶偶氮)-5-二乙氨基酚-亚硝酸钠体系的极谱吸附波  

Investigation of Adsorptive Wave of Zinc(Ⅱ)-2-(5-Bromo-2-Pyridylazo)-5-Diethylphenol-Sodium Nitrite

作　　者：杜芳艳[1] 邓保炜[1] 张慧[1] 

机构地区：[1]榆林学院化学与化工学院,陕西省榆林市西沙崇文路2号719000

出　　处：《光谱实验室》2010年第6期2434-2438,共5页Chinese Journal of Spectroscopy Laboratory

摘　　要：在(CH)_6N_4-HCl缓冲溶液中(pH5.6),当有NaNO_2存在时,Zn(Ⅱ)-2-(5-溴-2-吡啶偶氮)-5-二乙氨基酚络合物有一灵敏的吸附波,峰电位在-0.448V(vs.SCE)左右,该波的二阶导数峰峰电流与锌质量浓度在6.8×10^(-9)-1.69×10^(-7)mol/L范围内呈线性关系(r=0.9989,n=10)。检出限为0.001mg/L。本方法回收率在95.1%—104.9%之间。经多种电化学方法证明该波为络合物吸附波,其电极过程为不可逆过程。此外还试验了多种离子对峰电流I_P″的影响。所拟定的方法可用于红枣中微量锌(Ⅱ)的测定。In （CH2）6N4-HCl （pH5. 6）-NaNO2 buffer solution, zinc （ II ）-2-（5-bromo-2- pyridylazo）-5-diethylphenol complex causes sensitive polar graphic wave at the potential of -0. 448mV（vs. SCE）. The 2nd-order derivative peak current is liner with zinc（ II ） concentration in the rang of 6.8× 10-9 1.69 × 10- 7mol/L （r = 0. 9989, n = 10）, with detection limit of 0. 001mg/L. The recovery is between 95.1%-104.9% . Several electrochemical methods were used to study the properties of the wave. It is proved to be an adsorptive wave of the zinc complex, which electrode process is an irreversible reduced. The interference of diverse ions on the peak current was investigated. The proposed method has been applied to determine trace zinc in jujube with satisfactory result.

关 键 词：吸附波 2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br—PADAP) 亚硝酸钠 锌 

分 类 号：O657.14[理学—分析化学]