Table 3.

Statistics and proportion of heavy metal contamination factors ( C ) in wetland sediments/soils

	Proportion (C < 1)		Proportion (C > 1)		Mean		Max
	East	West	East	West	East	West	East	West
Cd	66.67%	100.00%	33.33%	0.00%	0.93	0.61	1.83	0.89
Cr	14.29%	0.00%	85.71%	100.00%	1.32	1.82	1.78	3.25
Cu	100.00%	88.10%	0.00%	11.90%	0.64	0.79	0.91	1.27
Ni	52.38%	4.76%	47.62%	95.24%	1.01	1.40	1.48	2.27
Zn	76.19%	11.90%	23.81%	88.10%	0.79	1.64	2.16	4.62
Pb	76.19%	69.05%	23.81%	30.95%	0.96	0.71	2.12	1.31

Note: Proportion means the number percentage of sample sites whose C met the demand in brackets accounting for the number of all sample sites.