Coastline Levels of Dissolved Heavy Metals in the Estuarine Water-System of Vigo.

It was found that Cu and Zn concentrations were highly correlated between them ( Figure 4 ), showing a similar pollution origin, probably due to anti-fouling paints [ 38 ], in such a way that, by linear regression analysis between Cu or Cu/Fe ratio and the rest of elements or element ratios, the following highly significant equations were found: (1) Cu = 0.577 × Zn + 0.101691 × Se (R 2 = 92.96%) (2) Cu/Fe = 0.575306 × Zn/Fe + 0.104448 × Se/Fe (R 2 = 93.32%) In the comparison of Cu concentrations in different coastal areas ( Table 3 ), the Vigo estuary has lower levels than the highly polluted areas of Xiangshan Bay (China; [ 39 ]) and the Yellow Sea (South Korea; [ 40 ]) and shows occasional higher copper levels than the Laoshan Bay (China; [ 41 ]) and the Gulf of Cádiz (South Spain; [ 42 ]). 4.

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