摘要
新型敏感材料研究将有助于探索新的敏感特性和机理。用硫酸镍、硫酸钴镀紫铜基体工作表面,制备了钴镍合金磷酸根离子敏感电极。结果表明,镀钴电极的响应斜率约为51mV/dec,线性范围为10^(-5)～10~2mol·L^(-1);当电极表面钴镍合金的比例(Ni/Co)为3/2和2/3时,响应斜率分别为37mV/dec和41mV/dec。线性响应范围均为10^(-4)～10^(-1)mol·L^(-1)[H_2PO_4^-]。实验发现,随着镀液中镍含量的增加,电极线性响应范围下降。本文对Ni-Co合金传感器响应特性进行了初步探索。
New phosphate ion sensitive electrodes have been prepared by electroplating a layer of Co or Co/Ni alloy film on the surface of a copper base. The current during 8-hour electroplating process was controlled at 3A/dm3 with a 1 mol·L-1 cobalt (Ⅱ) sulfate solution or a solution containing Co (Ⅱ) and Ni sulfates of a total concentration of 1 mol·L1. The electrode with cobalt plating film showed potcntiometrie response toward dihydrogen phosphate ion in a linear concentration range from 10-5 mol·L 1to 10 2 mol· L 1 with a slope of about 51 mV/dec. in 0. 05 mol· L-1 potassium acid phthalate buffer medium. When Ni-Co ratio were 3
: 2 and 2:3. the electrodes of Co-Ni alloy plating films possessed potentiometric response toward dihydrogcn phosphaste ion with a slope of about 37 mV/dec. and 41 mV/dec. , respectively, with the same linear concentration range from 1×10-4 to 1×10-1 mol · L -1 in 0. 05 mol
· L 1 potassium acid phthalate buffer medium. The mechanism of the electrode response was discussed in terms of nonsloichemistry concept.
出处
《化学传感器》
CAS
1998年第1期63-66,共4页
Chemical Sensors
