The paper reports on a study to evaluate dredged materials (DM) by determining the elemental content and mineralogical characteristics of 10 freshwater and estuarine DM from eastern and central U. S. waterways. Dredged materials exhibited variable accumulations of nutrients and metals reflecting varying degrees of waterway contamination. The levels of Al, Ca, K, Mg, P, and S were generally higher in DM than in reference Minnesota soils. Cadmium, Cr, Ni, Pb, and Zn concentrations in DM were 2 to 6 times, and Cu 20 times, those observed in the reference soils. Manganese concentrations were substantially less in DM than in the soils. Mineralogy varied with geographical location, contributing watershed, and environmental conditions. All DM contained kaolinite and illite. Amounts of montmorillonite varied. Cyrstalline Fe//2O//3 was associated with DM clay fractions.
|Original language||English (US)|
|Number of pages||7|
|Journal||Journal of Environmental Quality|
|State||Published - Jan 1 1982|