Evaluation of Carbonation Effects on Cement-Solidified Contaminated Soil Used in Road Subgrade

Table 1

Heavy metal pollution of soils in various regions.

Country	Location	Metal content (mg/kg)						References
		Cr	Pb	Cu	Zn	Cd	Ni
China	Guangdong	2600	150	4800	330	1.21	480	[9]
China	A rural area, Jianghan plain	253.8	4.88	64.6	—	20.3	589.5	[13]
Russia	Ekaterinburg	—	1027	370	—	—	663	[6]
France	Southern tailing area	—	9000	—	16,000	—	—	[5]
Turkey	73 places	830	968	167	165	1.7	249	[7]
Greece	Landfill site	172	93	356	344	18.8	66	[14]
Vietnam	Mining areas	135	—	1050	—	284	76.9	[8]
India	Nuggihalli, Karnataka	4863	84.1	153.6	—	—	1398	[15]
Background value in soil		133	31.8	41	114	0.314	58	[16]