硝酸盐含量常用于判断水体质量和受污染程度,是重要的水质检测指标。以玻碳电极为基底电极、聚3,4-乙烯二氧噻吩(PEDOT)为固态接触层、聚氯乙烯(PVC)为敏感基膜制备了一种新型全固态硝酸根离子选择性电极,并考察了该电极的电化学特性。...硝酸盐含量常用于判断水体质量和受污染程度,是重要的水质检测指标。以玻碳电极为基底电极、聚3,4-乙烯二氧噻吩(PEDOT)为固态接触层、聚氯乙烯(PVC)为敏感基膜制备了一种新型全固态硝酸根离子选择性电极,并考察了该电极的电化学特性。结果表明,以PEDOT为固态接触层能有效促进电极离子—电子之间信号传导,提高电极的稳定性。该电极在1×10^(-1)~1×10^(-5)mol/L范围内的硝酸铵溶液中呈良好的能斯特响应,响应斜率可达53.7 m V/dec,响应时间在50 s以内。该电极的重现性、选择性好,使用寿命超过3个月。展开更多
采用循环伏安法,在玻碳电极上电沉积聚苯胺作为固态接触层,再将铵离子敏感膜溶液滴涂于固态接触层表面,制得了全固态新型铵离子选择性电极,并优化了固态接触层和敏感膜的制备工艺,提高了电极的性能。测试结果表明,该电极在10-1~10-5mol/...采用循环伏安法,在玻碳电极上电沉积聚苯胺作为固态接触层,再将铵离子敏感膜溶液滴涂于固态接触层表面,制得了全固态新型铵离子选择性电极,并优化了固态接触层和敏感膜的制备工艺,提高了电极的性能。测试结果表明,该电极在10-1~10-5mol/L范围内呈现能斯特响应,响应斜率为59.30 m V/dec,检测下限低至5.0×10-6mol/L,重复测定的相对标准偏差小于2%;与商用电极相比,消除了Na+的干扰并提高了K+的选择性;用于实际废水分析时,电极检测结果准确、性能稳定,具有良好的应用前景。展开更多
A new solid-state mercury ion-selective electrode was prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28- bis[(1′-naphthalene) se...A new solid-state mercury ion-selective electrode was prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28- bis[(1′-naphthalene) selenopropoxy] calix[4]arene, dioctyl phthalate and potassium tetrakis(4-chlorophenyl) borate. The response of the electrode is linear with a good Nernstian slope of 31.5 mV/decade over an Hg 2+ ion concentration range of 5.0×10 -9—5.0×10 -2 mol/L and a detection limit of 1.0×10 -9 mol/L. The response time to achieve a 95% steady potential for Hg 2+ detection is less than 30 s, and the electrode is suitable for use within the pH range of 2—4. The selectivity for Hg 2+ relative to several alkali, alkaline earth, transition and heavy metal ions is good. The mechanism of the potential response of this system was also discussed.展开更多
文摘硝酸盐含量常用于判断水体质量和受污染程度,是重要的水质检测指标。以玻碳电极为基底电极、聚3,4-乙烯二氧噻吩(PEDOT)为固态接触层、聚氯乙烯(PVC)为敏感基膜制备了一种新型全固态硝酸根离子选择性电极,并考察了该电极的电化学特性。结果表明,以PEDOT为固态接触层能有效促进电极离子—电子之间信号传导,提高电极的稳定性。该电极在1×10^(-1)~1×10^(-5)mol/L范围内的硝酸铵溶液中呈良好的能斯特响应,响应斜率可达53.7 m V/dec,响应时间在50 s以内。该电极的重现性、选择性好,使用寿命超过3个月。
文摘采用循环伏安法,在玻碳电极上电沉积聚苯胺作为固态接触层,再将铵离子敏感膜溶液滴涂于固态接触层表面,制得了全固态新型铵离子选择性电极,并优化了固态接触层和敏感膜的制备工艺,提高了电极的性能。测试结果表明,该电极在10-1~10-5mol/L范围内呈现能斯特响应,响应斜率为59.30 m V/dec,检测下限低至5.0×10-6mol/L,重复测定的相对标准偏差小于2%;与商用电极相比,消除了Na+的干扰并提高了K+的选择性;用于实际废水分析时,电极检测结果准确、性能稳定,具有良好的应用前景。
文摘A new solid-state mercury ion-selective electrode was prepared by directly coating the surface of a glassy carbon electrode with tetrahydrofuran solution containing PVC, 25,27-dihydroxy-26,28- bis[(1′-naphthalene) selenopropoxy] calix[4]arene, dioctyl phthalate and potassium tetrakis(4-chlorophenyl) borate. The response of the electrode is linear with a good Nernstian slope of 31.5 mV/decade over an Hg 2+ ion concentration range of 5.0×10 -9—5.0×10 -2 mol/L and a detection limit of 1.0×10 -9 mol/L. The response time to achieve a 95% steady potential for Hg 2+ detection is less than 30 s, and the electrode is suitable for use within the pH range of 2—4. The selectivity for Hg 2+ relative to several alkali, alkaline earth, transition and heavy metal ions is good. The mechanism of the potential response of this system was also discussed.
