(1)当土壤电阻率大于100Ω· m时，可以使用-0.65V_cse和-0.75V_cse极化电位指标。

   使用较正的极化电位指标时，要注意土壤电阻率的数值准确性，地表测量的土壤电阻率有时会**管道实际所处环境的土壤电阻率。比如受阴极保护的管道，防腐层破损点附近的土壤电阻率可能会大幅度降低;管道处于砂石中，但底部可能有积水等，也会造成土壤电阻率大幅度降低。因此，即便土壤电阻率**100Ω·m， ，也应尽量使用- 850mV_cse极化电位指标。

(2) 当土壤电阻率大于100Ω·m、温度**40℃时，可以确认管道阴极保护较小指标。

Minimum index of soil resistivity and cathodic protection
(1) When the soil resistivity is greater than 100 Ω· m, -0.65Vcse and -0.75Vcse polarization potential indicators can be used.
When using positive polarization potential indicators, pay attention to the accuracy of soil resistivity. The soil resistivity measured on the surface is sometimes higher than the soil resistivity of the actual environment where the pipeline is located. For example, for cathodic protection pipelines, the soil resistivity near the damage point of the anti-corrosion coating may be significantly reduced; The pipeline is in sand and gravel, but there may be ponding at the bottom, which will also cause a significant reduction in soil resistivity. Therefore, even if the soil resistivity is higher than 100 Ω· m, - 850mVcse polarization potential index should be used as far as possible.
(2) When the soil resistivity is greater than 100 Ω· m and the temperature is higher than 40 ℃, the minimum index of pipeline cathodic protection can be confirmed.