Mn, Zn, Ni, Cu, Pb and Cr from a steel industry were studied in soils from an alpine valley near Turin (NW Italy). Dusts fell onto the agricultural lands in the valley floor as first demonstrated by a lichens analysis. Soil analysis showed that total metals were often very high without differences between topsoils and deeper layers, except Pb. In order to assess the risky zones a geostatistical approach was considered, lacking the parameters needed for modeling and because of the complex terrain. A spatial dependence for several metals was detected, but isarithmic maps from Kriging showed that the fallout of these single elements was not uniform. From a multivariate analysis a linear combination of total metals was computed: its score, used as a global index, well described the spatial distribution of the fallout. An effect of the high mountain walls on the fallout peaks was then suggested. Mn, Zn, Ni, Cu, Pb and Cr from a steel industry were studied in soils from an alpine valley near Turin (NW Italy). Dusts fell onto the agricultural lands in the valley floor as first demonstrated by a lichens analysis. Soil analysis showed that total metals were often very high without differences between topsoils and deeper layers, except Pb. In order to assess the risky zones a geostatistical approach was considered, lacking the parameters needed for modeling and because of the complex terrain. A spatial dependence for several metals was detected, but isarithmic maps from Kriging showed that the fallout of these single elements was not uniform. From a multivariate analysis a linear combination of total metals was computed: its score, used as a global index, well described the spatial distribution of the fallout. An effect of the high mountain walls on the fallout peaks was then suggested.
Heavy metals in soils near a steel-making industry: a case study in a complex valley situtation in Italy
ZANINI, Ermanno;BONIFACIO, Eleonora;
1992-01-01
Abstract
Mn, Zn, Ni, Cu, Pb and Cr from a steel industry were studied in soils from an alpine valley near Turin (NW Italy). Dusts fell onto the agricultural lands in the valley floor as first demonstrated by a lichens analysis. Soil analysis showed that total metals were often very high without differences between topsoils and deeper layers, except Pb. In order to assess the risky zones a geostatistical approach was considered, lacking the parameters needed for modeling and because of the complex terrain. A spatial dependence for several metals was detected, but isarithmic maps from Kriging showed that the fallout of these single elements was not uniform. From a multivariate analysis a linear combination of total metals was computed: its score, used as a global index, well described the spatial distribution of the fallout. An effect of the high mountain walls on the fallout peaks was then suggested. Mn, Zn, Ni, Cu, Pb and Cr from a steel industry were studied in soils from an alpine valley near Turin (NW Italy). Dusts fell onto the agricultural lands in the valley floor as first demonstrated by a lichens analysis. Soil analysis showed that total metals were often very high without differences between topsoils and deeper layers, except Pb. In order to assess the risky zones a geostatistical approach was considered, lacking the parameters needed for modeling and because of the complex terrain. A spatial dependence for several metals was detected, but isarithmic maps from Kriging showed that the fallout of these single elements was not uniform. From a multivariate analysis a linear combination of total metals was computed: its score, used as a global index, well described the spatial distribution of the fallout. An effect of the high mountain walls on the fallout peaks was then suggested.
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