摘要:
研究了基于氮杂冠醚为中性栽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8.0×10-5～1.0×10-1 mol/L,检测限为4.0×10-5 mol/L,斜率为20.0 mV/dec.,响应时间为20.0 s.该电极用于EDTA的电位滴定,结果令人满意.
Abstract:
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.
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