摘要
通过配制五种不同pH的粉土土样,运用电化学阻抗谱(EIS)研究了pH对粉土电化学特性的影响,试验结果表明:pH对粉土Nyquist图影响表现为准Randles型曲线,即高频区一个圆弧和低频区的斜线;Bode图中阻抗模值随着频率上升而下降并随着粉土的pH的改变呈规律性变化;不同pH的粉土其等效电路模型主要包括溶液电阻、电荷传递电阻、常相位角元件及扩散电阻四个电化学元件,其中溶液电阻、电荷传递电阻、扩散电阻的数值均在粉土的pH为7时最大,而常相位角元件双电层电容参数值在粉土的pH为7时最小。
Through the preparation of five soil samples with different pH values,the effect of pH value on the electrochemical properties of silty soil was studied by the method of electrochem-ical impedance spectroscopy（ EIS）. The results show that the Nyquist curves of silt with different pH values present Quasi-Randles curve consisting of circular arc in high frequency region and oblique line in the low-frequency region. In the Bode diagram,the impedance modulus decreases with the increase of frequency and changes regularly with the change of the pH value of silty soil. The equivalent circuit model of silt with different pH values mainly includes four kinds of electrochemical elements： solution resistance,charge transfer resistance,the constant phase angle element and diffused resistance. Among them the parameter values of the solution resistance,charge transfer resistance and diffusion resistance acquire the maximum when the pH value of the solity soil is 7,while the parameter value of the double layer capacitance of the constant phase angle element is the smallest when the pH value of the solity soil is 7.
出处
《科学技术与工程》
北大核心
2017年第17期297-303,共7页
Science Technology and Engineering
基金
山西省自然科学基金(2014011036-1
2014131019)
山西省高等学校优秀创新团队项目(OIT2015)
天津大学水利工程仿真与安全国家重点实验室项目(HESS1613)资助
关键词
PH
粉土
等效电路
电化学阻抗谱
Nyquist图
BODE图
the value of pH
solity soil
equivalent circuit
electrochemical impedance spectroscopy（EIS）
Nyquist diagram
Bode diagram
