【摘要】 合成了一种新型对甲基苯磺酰化蛋氨酸镧配合物,并利用红外光谱、紫外光谱及热重分析对配合物及配体的结构进行了表征和确认。以对甲基苯磺酰化蛋氨酸镧配合物作为修饰剂,研制了修饰碳糊电极,该电极对镧离子具有能斯特响应,为此建立了溶液中镧离子的直接电位分析法。修饰电极对镧离子的能斯特响应工作曲线方程为E(mV)=-19.50pCLa(III)-363.50,相关系数R=0.9996,线性范围为4.0×10-2~4.0×10-6mol.L-1,检测下线为1.6×10-6mol.L-1,pH响应范围是3.2~6.0。试验了14种外加离子对测定的影响,结果表明Ca2+,Mg2+,Zn2+,Ba2+,Cu2+,Co2+等金属离子对测定有微弱干扰。利用该修饰电极对人工合成样品中镧离子含量进行测定。更多还原

【Abstract】 A novel La complex of 2-(4-methylphenylsulfonamido)4-(methylthio)butanoic acid was synthesized and characterized by elemental analysis,IR,etc.The complex was used to modify a carbon paste electrode to explore the selectivity of La3+.The sensor worked satisfactorily in the concentration range from 4.0×10-2 to 4.0×10-6 mol·L-1(detection limit 1.6×10-6 mol·L-1) with a Nernstian slope of 19.5 mV per decade in the pH range from 3.2 to 6.0.Under the optimum conditions,the common inorganic ions and organic ions did a little interference.The electrode was satisfactorily applied to the determination of La(Ⅲ) in the man-made sample.更多还原