镍(Ⅱ)与5-(5-碘-2-吡啶偶氮)-2,4二氨基甲苯络合物吸附波的研究及应用  

Study on the adsorptive wave of complex of nickel(Ⅱ) with 5-(5-iodine-2-pyridylazo)2,4-diaminotoluene and its application

作　　者：韩权[1,2] 霍燕燕[2] 杜倩[1] 杨晓慧[1] 杨龙虎[2] 

机构地区：[1]西安文理学院化学与化工系,陕西西安710065 [2]延安大学化学与化工学院,陕西延安716000

出　　处：《冶金分析》2012年第5期18-22,共5页Metallurgical Analysis

基　　金：陕西省自然科学基础研究计划项目(2010JM2018);西安市科技计划项目(CXY1134WL38)

摘　　要：研究了镍(Ⅱ)与新试剂5-(5-碘-2-吡啶偶氮)-2,4-二氨基甲苯(5-I-PADAT)络合物的极谱行为。结果表明,在pH6.0的Na2HPO4-NaH2PO4缓冲液中,镍(Ⅱ)络合物产生一灵敏的极谱波,其峰电位Ep为-1 100mV(vs.SCE),镍质量浓度分别在0.06～0.4μg/mL和0.4～3.5μg/mL范围内与峰电流Ip″有良好的线性关系,检出限为24.9ng/mL。经多种电化学方法研究证明该波为络合物吸附波,其电极过程为不可逆过程,电子转移数为2。所拟方法用于镍矿石中镍含量的测定,结果的相对标准偏差为1.9%(n=6),测定值与火焰原子吸收光谱法的测定值相符。The polarographic behavior of complex between nickel （Ⅱ） and new coloring reagent 5-（5-io- dine-2-pyridylazo）-2,4-diaminotoluene （5-I-PADAT） was studied. The results showed that nickel（Ⅱ） had a sensitive polarographie wave in Naz HPO4-NaHzPO4 buf{er solution at pH 6.0 with peak current of Ep =-1 100 mV （vs. SCE）. The mass concentration of nickel in range of 0.06-0.4 ug/mL and 0.4 --3.5 ug/mL was linear to the peak current （Ip＂）. The detection limit was 24.9 ng/mL. Several elec-trochemical methods proved that this wave was adsorption wave of complex. The electrode process was irreversible, and the electron transfer number was 2. The proposed method was applied to the de- termination of nickel in nickel ore with relative standard deviation of 1.9 % （n=6）, and the determination values were in good agreement with those obtained by FAAS.

关 键 词：镍(Ⅱ) 5-(5-碘-2-吡啶偶氮)-2 4-二氨基甲苯 络合物 极谱吸附波 

分 类 号：O657.14[理学—分析化学]