Table 5.

Statistical information of heavy metal contents in asbestos pollution sources.

Statistics	As	Hg	Cd	Pb	Cr	Cu	Zn	Ni
Minimum value	8.87	0.016	0.038	3.39	890	4	13	1600
Maximum value	17.1	0.022	0.094	13.2	1560	16	20	2000
Average value	14.73	0.02	0.07	6.23	1339.17	10.33	13.33	1788.33
Standard deviation	2.10	0.00	0.02	2.93	218.50	3.50	2.29	135.70
Coefficient of variation	0.14	0.10	0.27	0.47	0.16	0.34	0.17	0.08