Effects of Soil Properties on Pb, Cd, and Cu Contents in Tobacco Leaves of Longyan, China, and Their Prediction Models

Table 2

Descriptive statistics of total and bioavailable concentrations of Pb, Cd, and Cu in soils.

Item	Sample number	Min (mg/kg)	Max (mg/kg)	Average (mg/kg)	Standard deviation	Coefficient of variation (%)	Secondary standard	Overlimit ratio (%)
Pb	421	1.39	49.9	12.1	6.99	57.9	28.0	0.951
Cd	421	0.003	0.950	0.092	0.063	68.3	0.150	12.1
Cu	421	0.031	19.1	3.88	2.41	62.1	15.0	1.12