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文章以金属钴为基体,在其表面形成对磷酸二氢盐有良好电化学响应的氧化钴敏感膜,成功的制备了磷酸盐离子选择性电极。详细讨论了不同活化时间和不同活化溶液对磷酸盐检测的线性响应范围、响应斜率及检测限的影响。实验结果表明:该基于钴的磷酸盐离子选择性电极在0.025 mol/L邻苯二甲酸氢钾的底液中,对磷酸二氢盐在10-4~10-1mol/L浓度范围内呈线性响应,其响应斜率为-48.27 mV/dec,检测限为2.27×10-5mol/L,相关系数R2为0.99。该电极具有良好的稳定性和重现性。已成功用于实际自来水样中磷酸二氢盐的检测,结果满意。
In this paper, cobalt (Co) as substrate, a cobalt oxide sensitive membrane with good electrochemical response to dihydrogenphosphate was formed on the surface of the membrane, and a phosphate ion selective electrode was successfully prepared. The effects of different activation times and different activation solutions on the linear response range, response slope and detection limit of phosphate detection were discussed in detail. The experimental results show that the cobalt-based phosphate ion-selective electrode is linear in the concentration range of 10-4-10-1 mol / L in 0.025 mol / L potassium hydrogen phthalate solution, Response, the response slope of -48.27 mV / dec, detection limit of 2.27 × 10-5mol / L, the correlation coefficient R2 was 0.99. The electrode has good stability and reproducibility. Has been successfully used in the actual tap water samples of dihydrogen phosphate detection, the results are satisfactory.