Biological and chemical sampling
Each year Vigo, Bilbao and Pasajes are visited and simples are taken over two or three days. Five or six zones at each port are analysed, one of which is believed to be clean, i.e. as a control, and the other four or five contaminated. "We place 20 or 30 mussels mounted on plastic supports and inside gauzes, and submerge them at a depth of two metres", explained Dr Etxebarria, "after a certain period, we collect them for analysis of level and type of contamination accumulated".
But using living beings to measure contamination also has its risks. "In some cases the contamination is high and the mussels can die", states Dr Etxebarria. This is why the UPV/EHU team has created a new method for monitoring contaminants: "by using polymeric mountings, we simulate chemically what the mussels do, i.e. accumulate contaminants". Moreover, in this way, it is possible to systemise the sampling.
Evaluation of the tools
The research led by Nestor Etxebarria is to finish in 2009, but they already have some provisional results. "The situation in the port of Bilbao is quite homogenous; we have taken samples in the areas of Getxo, Santurce and the exterior port (Bilbao, in the Basque Country) and the results are similar in each case. On the other hand, in Vigo (Galicia) we detected wide d
|Contact: Garazi Andonegi|