二(乙基黄原酸基)金属配合物为中性载体高选择性碘离子电极的研究  

Di(ethylxanthate) Complexes of Metal (II)as Neutral Carriers for Highly Selective Iodide Electrodes

作　　者：袁若[1] 林守群 沈国励[1] 田德余[2] 俞汝勤[1] 

机构地区：[1]湖南大学化学计量学及化学传感技术研究所,长沙410082 [2]国防科学技术大学材料科学与应用化学系,长沙410073

出　　处：《化学学报》1996年第5期516-520,共5页Acta Chimica Sinica

基　　金：湖南省自然科学基金;国家教委博士点基金资助的课题

摘　　要：本文研究了二(乙基黄原酸基)金属配合物为中性载体的阴离子选择性电极,其中二(乙基黄原酸基)钴(Ⅱ)对碘离子有高的选择性,且电极呈现反Hofmeister行为,其选择次序是:1^->SCN>NO_2^->Br^->ClO_4^->SO_4^(2-)>NO_3^->Cl^-,采用交流阻抗和光谱分析技术研究了电极的响应机理,并将电极用于药品分析,结果令人满意.The present paper describes solvent polymeric membrane anion selective electrodes based on di(ethylxanthate) complxes of metal(II) [cobalt(II), mercury (II) andzinc(II)] as neutral carriers. The electrode incorporating cobalt(II) - di(ethylxanthate) has high selectivity toward the iodide ion and demonstrates anti - Hofmeister behaviour. The electrode showed a near - Nernstian potentiometric response for 10-1 ~ 10-6mol/L I- with a detection limit of 7. 9 × 10-7mol/L and a slope of 54 mV/pI- (20℃). The electrode has low resistance, fast response time, fair stability and reproducibility. The selectivity sequence observed is iodide > thiocyanate > nitrite > bromide > perchlorate > sulfate > nitrate > chloride. The response mechanism of the electrode was also studied with the a. c. impedance and spectroscopic techniques.

关 键 词：乙基 黄原酸基 配合物 碘 离子选择性电极 

分 类 号：O613.44[理学—无机化学] O657.1[理学—化学]