Electrochemical behavior for ternary complex of zinc(Ⅱ)- 2-(5-bromo-2-pyridylazo)-5-diethylamino phenol-sodium nitrite on carbon paste electrode and its application
LI Mei,DU Fang-yan*,DING Yu
Department of Chemistry and Chemical Engineering, Yulin College, Yulin 719000,China
Abstract：The electro-chemical behavior of a ternary complex zinc(Ⅱ)-2-(5-bromo-2-pyridylazo)-5-diethylamino phenol-sodium nitrate [Zn(Ⅱ)-5-Br-PADAP-NaNO2] on carbon paste electrode (CPE) was studied, and a method of square wave voltammetry (SWV)for the determination of trace zinc was established. The experiments indicated that, in hexamethylene tetramine-hydrochloric acid buffer solution at pH 5.4, when the concentration of 5-Br-PADAP and NaNO2 was 3.0×10-5 mol/L and 5.0×10-5 mol/L respectively with amplitude as 0.025 V and frequency as 60 Hz, Zn(Ⅱ)-5-Br-PADAP-NaNO2 complex produced a sensitive adsorption oxidation peak at 0.292 V(vs.SCE) after enrichment of 45 s at -0.40 V(vs.SCE) and scanning in the range of -0.40 V to 0.60 V at the scan rate of 100 mV/s by SWV. The concentration of zinc showed a good linear relationship with the peak current Ip of the complex within the range of 5.0×10-9-5.0×10-6 mol/L, with linear correlation coefficient of 0.998 9. The detection limit was 1.7×10-9 mol/L. The method has been applied to determine trace zinc in environmental water and tap water. The results were consistent with those obtained by dithizone photometric method, and the relative standard deviations (RSDs,n=6) were 1.9%-2.5%. The recoveries were 97%-105%.
黄作明,黄珣. 微量元素与人体健康[J]. 微量元素与健康研究(Studies of Trace Elements and Health),2010,27(6):58-62.
[2]
韩春雨,李雅静. 微量元素与人体健康[J]. 广东化工(Guangdong Chemical Industry), 2013,40(15):88,82.
[3]
王玉宝,陈玉静,李桂华. 双波长双指示剂-催化动力学光度法测定奶粉中的锌[J]. 分析试验室(Chinese Journal of Analysis Laboratory), 2010,29(2):118-120.
[4]
GHAEDI M, TAVALLALI H, SHOKROLLAHI A,et al. Flame atomic absorption spectrometric determination of zinc, nickel, iron and lead in different matrixes after solid phase extraction on sodium dodecyl sulfate (SDS )-coated alumina as their bis (2-hydroxyacetophenone)-1,3-propanediimine chelates[J]. Journal of Hazardous Materials, 2009,166: 1441-1448.
[5]
何绍攀,范广宇,蒋小明. 钨丝电热原子吸收光谱分析法测定痕量锌[J]. 分析化学(Chinese Journal of Analytical Chemistry),2010,38(5):707-710.
[6]
韩张雄,马娅妮,陶秋丽. 微波消解样品-电感耦合等离子体质谱法测定小麦中铜、锌、镉、镍和铅[J]. 理化检验:化学分册(Physical Testing and Chemical Analysis Part B:Chemical Analysis),2013,49(10):1199-1201.
[7]
YASUKO A,SHIGEHIRO K,KAORI S,et al.Determination of Al,Cr,Fe,Zn,Cd,Pb and Bi in crude drugs by inductively coupled plasma atomic emission spectrometry after coprecipitation with yttrium phosphate[J]. Journal of Health Science,2008,54(6) : 682-685.
[8]
赵立艳,曹婵月,陈贵堂,等.ICP-AES法测定两个等级的三种绿茶中九种矿物质元素含量[J]. 光谱学与光谱分析(Spectroscopy and Spectral Analysis),2011,31(4):1119-1121.
[9]
Locatellc,Torsig. Simultaneous squarewave anodic stripping voltammetric determination of Cr, Pb, Sn, Sb,Cu, Zn in presence of reciprocal interference: application tomealmatrices [J]. Microchemical Journal, 2004, 78(2): 175-180.
[10]
Shams E, Babaeia, Soltaninezhadm. Simultaneous determination of copper, zinc and lead by adsorptive stripping voltammetry in the presence of Morin [J]. Anal. Chim. Acta, 2004, 501 (1): 119-124.
[11]
刘振琼,郭子英,申婧翔. 差分脉冲溶出伏安法测定中药何首乌中的锌含量[J]. 化学分析计量(Chemical Analysis and Meterage), 2011,20(6) :65-67.
[12]
苏文斌. 铋膜电极差分脉冲溶出伏安法同时测定食物中的锌和铜[J]. 安徽农业科学(Journal of Anhui Agri.Sci.),2011,39(3) :1303-1305,1307.
[13]
马永钧,杨海青,彭波,等.铕离子掺杂类普鲁士蓝复合铋膜电极阳极溶出法测定痕量锌[J]. 西北师范大学学报:自然科学版(Journal of Northwest Normal University:Natural Science),2010,46(4):62-65,73.
[14]
张春梅,吴峰,李柏元,等. 石墨烯-Nafion／纳米金复合物修饰玻碳电极阳极溶出伏安法测定大米中痕量锌[J].理化检验:化学分册(Physical Testing and Chemical Analysis Part B:Chemical Analysis),2013,49(11):1321-1325.
[15]
李建平,陆继勇.固体汞合金电极电位溶出法同时测定痕量锌、镉、铅[J].应用化学(Chinese Journal of Applied Chemistry),2006,23(9):1006-1009.
GADHARI N S,SANGHAVI B J,KARNA S P,et al. Potentiomet-ric stripping analysis of bismuth based on carbon paste electrode modified with cryptand and multiwalled carbon nanotubes [J].Electrochim. Acta, 2010,56(2):627-635.
[18]
魏小平,梁青梅,李建平.锑电极电位溶出法测定锌、镉、铅[J]. 中国无机分析化学(Chinese Journal of Inorganic Analytical Chemistry),2011,1(4):91-93.
