冠醚化合物为载体的PVC膜新型铝离子选择电极研究

研究了基于氮杂冠醚为中性载体的阳离子选择性电极，该电极在pH为3．0的硝酸缓冲介质中对铝离子有近能斯特响应，其线性范围为8．0×10^-5～1．0×10^-1mol／L，检测限为4．0×10^-5mol／L，斜率为20．0mV／dec．响应时间为20．0S．该电极用于EDTA的电位滴定，结果令人满意．

A Novel Al3+-Selective Electrode with Crane Ether as the Neutral Carrier

A novel poly (vinyl chloride) (PVC) membrane sensor for aluminum ions was prepared by employing 1,1,6,6,11,11,16,16-eight methyls-21,22,23,24-four azacrown ether as a neutral carrier. The electrode exhibited a near Nernstian response over a wide concentration range from 8.0 × 10-5 to 1.0 × 10-1 mol/L and the detection limit of the sensor was 4.0×10-5 mol/L in the pH range of 2.0-4.0. The sensor exhibited a Nernstian slope of 20.0 mV per decade. The response time of the sensor was about 20.0 s and it could be used over a period of 3 months without any divergence in potential. The proposed sensor showed good selectivity toward Al3+ over a wide variety of other alkali, alkaline earth, transition and heavy metal ions. The electrode has been used as an indicator electrode in potentiometric titration of Al3+ with EDTA.