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  • Article title : Heavy metal contamination in an urban watershed in southeastern Michigan, USA
    Article type : Geochemistry
    Location : International Geological Congress,oslo 2008

    Fulltext :

    Heavy metal contamination in both soil and the shallow groundwater was discovered and monitored over a period of several years to determine its impact on surface water quality the a heavily urbanized Rouge River watershed in southeastern Michigan, USA. A spatially dispersed set of soil samples were collected to capture the inherent variability of soils and historic land use. The analysis focused on 11 metals (arsenic, barium, cadmium, chromium, copper, lead, mercury, nickel, selenium, silver and zinc) that are part of the USEPA’s list of the most common pollutants. Metal concentrations in the soils were measured at three depths: near surface (<.5m), shallow subsurface (0.5-10m) and depths greater than 10m across six soil units in glacial terrain. Additional analyses assessed the metal concentrations in each depth profile across three general land use categories: residential, commercial and industrial. Metal concentrations in the shallow groundwater were then obtained and compared to their corresponding mean concentrations within the vadose zone soils. The results suggest that former and current land use activities have resulted in significant adverse impacts on the study region. Metal concentrations in the near-surface soils were the highest with lead present at 15.5 times that of background in industrial areas and approximately 16 times the background in residential areas. Cadmium, mercury and zinc were also present in near-surface soils at levels several times that of their respective background concentrations. Total chromium levels were found in the shallow groundwater beneath industrial sites at 20 to 30 times the maximum contaminant level (MCL) for drinking water. More importantly, recent work suggests that the chromium is in a hexavalent form and is spreading across the watershed into residential areas and is now found, along with lead and mercury in the surface water and sediments of the watershed. Because the Rouge River is a tributary to the Detroit River, it represents a significant source of contamination to the lower Great Lakes.

    Address : 1Univ. of Michigan, United States-2Amsted Industries, United States
    Celebration date : 8 Monday September 2008
    Author name : Murray, Kent1; Kaufman, Martin1; Rogers, Daniel2
    
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