A Method for Identifying Pollution Sources of Heavy Metals and PAH for a Risk-Based Management of a Mediterranean Harbour

Table 2

Weights of each chemical on the overall variance.

PCA of chemicals	(A) % overall variance	(B) % overall variance; (after Zn elimination)
Arsenic	0.31	1.23
Cadmium	0.36	1.48
Cobalt	0.01	0.10
Total chromium	0.09	0.45
Chromium VI	0.00	0.00
Mercury	0.48	1.75
Nickel	0.15	0.67
Lead	13.75	51.72
Copper	2.09	7.80
Tin	0.14	0.91
Zinc	76.29	—
Benzo(a)anthracene	0.15	0.73
Benzo(a)pyrene	0.10	0.47
Benzo(b)fluoranthene	0.10	0.43
Benzo(k)fluoranthene	0.09	0.40
Benzo(g,h,i)perylene	0.07	0.30
Chrysene	0.15	0.70
Dibenzo(a,h)anthracene	0.02	0.06
Indeno(1,2,3-c,d)pyrene	0.06	0.27
Pyrene	0.31	1.43
Sum-PAH	0.86	3.89
Hydrocarbons C < 12	0.00	0.01
Hydrocarbons C > 12	4.39	25.19