Study on The Influence of Direct Ground Liquid CO₂ Injection on Soil Chemical Properties in Subsidence Areas under Shallow Buried Geological Conditions

Table 7

Soil pH classification table [25].

pH	Soil acidity and alkalinity
<4.5	Very strong acidic
4.5∼5.5	Strong acidic
5.5∼6.0	Acidic
6.0∼6.5	Weak acidic
6.5∼7.0	Neutral
7.0∼7.5	Alkalescent
7.5∼8.5	Alkaline
8.5∼9.5	Strong alkaline
>9.5	Very strong alkaline