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Measurement of magnetic susceptibility of soil adjacent a steel factory in Lanzhou and its environmental implications |
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Abstract Measurement and analysis of magnetic susceptibility and heavy metal concentrations of soil from a steel factory near Lanzhou City was developed. Results showed that the magnetic susceptibility in uppermost soil horizon (0~2cm) increased significantly relative to the deep soil. The value of susceptibility was 3.5 times of the background, but the frequency magnetic susceptibility was lower relative to the deep soil. The variation of magnetic susceptibility value in the different sampling positions showed that the soil around the steel factory was polluted by the anthropogenic dust input from steel factory. Pollution was mainly found in the downwind direction area, of which the strongest part was in a range of 2 km and a depth of 2 cm. Chemical element analysis showed a strong correlation between the magnetic susceptibility and metals, suggesting they have the same source. Magnetic susceptibility concentration factor (S) was adopted to determine the degree of soil pollution, and the results were basically the same with the Nemerow index. Therefore, S could be used as an indicator to determine the soil pollution.
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Received: 09 January 2011
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