Analysis of soil pollution distribution of heavy metal in residential area considering industrial type of each city

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Situation of soil pollution today by heavy metals in Japan was measured, and its characteristics was analyzed. Efficiency of some measurement methods of heavy metal soil pollution was also studied. The following conclusions were obtained.1. Hydrochloric acid extraction method was better than some other methods for investigating local characteristics of soil pollution.2. New sampling method, which collected ground soil dividing a sampling column into two layers, 2.5cm upper soil and 2.5cm lower soil, and new analyzing method, which analyzed the difference of the two layer soil, was proposed. This method was efficient for identifying the effect of the chemical fallout, and able to sampling the time of pollution approximately.3. Field survey in the central Japan area showed the great effect of metal mining industry and the existence of heavier pollution in several tens years ago than today in Pacific coast.4. Indices of human activity were proposed. Multiple linear regression analysis with the indices as independent variables and heavy metal concentration as dependant variables showed that Cr and Co were affected by the index of population density, that Sn seemed to have relationship to the distance from incineration plants, and that Zn and Cd was typically affected by mining industries.5. Health risks of direct intakes of soil were analyzed. It was shown that Pb and As had larger proportion in health risks than other heavy metals.6. 1N hydrochloric acid extraction method was good alternative to PBET, Physiologically Based Extraction Test.