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

Table 5

P4 soil test results.

Number	pH value	Available nitrogen (mg/kg)	Available potassium (mg/kg)	Water-soluble salt (g/kg)	Total organic carbon (TOC) (g/kg)	Total carbon (TC) (g/kg)	Bicarbonate ions () (mg/kg)	Carbonate ions (^-) (mg/kg)
P4FD1	5.45	444.27	29	1.9	4.1	7.03	21.85	0
P4FD2	5.10	408.41	33	2.8	5.1	8.63	22.15	0.35
P4FD3	6.22	473.45	30	2.7	2.7	4.63	21.9	0
P4XD1	4.87	385.23	31	14.8	1.2	2.4	22.4	0
P4XD2	4.79	378.81	32	14.9	5	8.4	22.65	0.25
P4XD3	6.01	374.84	29	1.6	2.8	4.7	22.45	0