摘要
本文报道了一种镍离子选择性电极,它以我们合成的异菸酸十六烷酯作中性载体,该电极对浓度范围为10^(-1)～8×10^(-5)mol/L的镍离子有线性响应,斜率为-25.5±0.4 mV/pC_((Ni)^(2+))(20℃).相对于钠、钾、锂、钙、锡、铁、钴、铜离子的选择性系数分别为:8.1×1^(-5)、8.6×10^(-5)、8.2×10^(-5)、4.1×10^(-3)、7.5×10^(-4)、3.2×10^(-2)、8.0×10^(-2)、4.4×10^(-1).电极重现性优良,响应较快,用交流阻抗法研究了电极膜的传导机理,实验结果表明电极过程受扩散过程控制。
The present paper describes a new nickel ion selective electrode with a neutral carrier, hexadecyl iso-nicotinate synthesized in our laboratory. The electrode shows a linear response to Ni2+ ions in the range of 10-1 - 8×10-5 mol/L with a slope -25. 5 ± 0. 4 mV/pC(20±1℃). The potentiometric selectivity coefficients for nickel ions with respect to Na4+ , K+ , Li+ , Ca2+, Sn2+, Fe2+, Co2+and Cu2+ are 8. 1×10-5, 8. 6×10-5, 8. 2×10-5, 4. 1×10-3, 7. 5×10-4, 3. 2 × 10-2, 8. 0 × 10-2 and 4. 4 × 10-1, respectively. The electrode has a fair reproducibility and quick potential response. The conductivity mechanism of the membrane was studied with A. C. impedance method. The experimental results show that the transfer process of Ni2+ ions across the solvent polymeric membrane is controlled by the diffusion process.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第1期27-30,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
中国科学院长春应用化学研究所电分析化学开放研究实验室资助
关键词
镍
离子选择电极
异菸酸
十六烷酯
Hexadecyl iso-nicotinate, Nickel ion selective electrode, Neutral carrier
