Saturday, 15 July 2006

Heavy Metals in Murcia City (Se Spain): Preliminary Data.

Jose A. Acosta, Ángel Faz Cano, and Silvia Martínez-Martínez. Technical University of Cartagena, Area of Edafology and Agricultural Chemistry. Department of Agrarian Science and Technology, Paseo Alfonso XIII, nº 52, 30230, Cartagena. Murcia. Spain, Cartagena, Spain

This study is part of a research whose objective is to assess the effect of anthropic activities in different soil uses including urban, industrial, agricultural and undisturbed areas of the Murcia city and surrounding (SE Spain). Preliminary data of the heavy metals present in parks of the city are presented. Keeping in mind that the parks of the cities are places where the trace metals can be accumulated and where usualluchildren play, it is important to analyze the metal concentration in soil, with the objective of determining the risk for them. We examined the degree of heavy metal concentrations in 36 sampling points distributed inside the city. The soils were digested with nitric/percloric acid solution. The studied metals were Pb, Cu, Zn, Cd, Cr, Mn and Ni. These metals have different sources of contamination in urban parks: traffic, fillers brought to the parks, atmospheric deposition of next industrial areas or application of fertilizers and irrigation waters, etc. From the point of view of the studied city, this work shows that the next industrial areas are sufficiently far and are not increasing the content of heavy metals in the parks; therefore the risk of atmospheric deposition of heavy metals by this source is not important. On the other hand, it was shown that in areas with vegetation occurs heavy metal concentration higher than those areas without vegetation, except for the copper; perhaps due to application of fertilizers, compost and irrigation waters. Using reference values given by the Italian legislation it was shown that some samples present lead content that exceed the acceptable limit to consider a polluted soil for residential sites. The rest of metals doesn't exceed the limit allowed by this legislation. Averages of metal concentration are: 2.726 mg Cr/kg; 68.74 mg Mn/kg; 3.805 mg Ni/kg; 9.48 mg Cu/kg; 20.78 mg Zn/kg; 0.141 mg Cd/kg and 31.01 mg Pb/kg. On the other hand, correlation is appreciated among Pb-Cd (r = 0.773), Cu-Mn (r = 0.756), Ni-Mn (r = 0.843) and Ni-Cu (r = 0.710), suggesting that these metals had common sources.

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