Distinct Dispersion of As, Cd, Pb, and Zn in Farmland Soils near Abandoned Mine Tailings: Field Observation Results in South Korea

Table 3

Statistical summary of metal(loid) concentrations (mg/kg) in agricultural soils of the study area.

	Mean (N = 162)	Median	Min	Max	SD	CV	Skew.	Kurto.	(K–S test)	BMC	WS	NL	NL > BMC
As	5.99	5.14	0.78	25.00	3.77	62.9	2.871	10.194	0.00	6.24	6.00	25.00	1
Cd	0.88	0.66	0.10	5.50	0.87	98.5	2.627	8.946	0.00	0.14	0.35	4.00	2
Pb	76.20	49.44	8.78	567.95	82.85	108.7	3.678	15.405	0.00	20.07	35.00	200.00	9
Zn	128.93	93.73	37.67	646.78	100.60	78.0	2.593	8.083	0.00	71.07	90.00	300.00	11

SD: standard deviation; CV: coefficient of variation; Skew.: skewness; Kurto.: kurtosis; (K–S test): values of Kolmogorov–Smirnov test for normality of the raw data (for values higher than 0.05, the distribution is normal); BMC: background metal concentrations for unpolluted agricultural soils of South Korea [32]; WS: world soils unpolluted [33]; NL: national limits according to the soil quality standards of South Korea [31]; NL > BMC: number of samples with a concentration exceeding the national limit.