Trace cobalt sorption on 21 sediment types from the Hanford site, Washington

Studies were conducted at the Hanford site in Washington State to measure the 200 East and 200 West Separation Areas' sorption properties for trace cobalt (60Co). Twenty-one sediment types were delineated from five wells. Twenty-one empirical distribution coefficient (Kd) equations were developed for trace 60Co sorption of 21 sediment types from the Hanford Site 200 Separation Areas. The coefficients in these equations for 60Co were internally of the same general form. Average coefficient values were computed for 60Co and compared with individual sediment type coefficients. These data are required for the transport modeling of 60Co in varied sodium, calcium, and potassium soil-water systems. A sensitivity analysis of retardation factor values for two selected sediment chemical systems were evaluated to determine if additional 200 Separation Areas' sediment measurements are required. Retardation factors were compared for paired sediment types which occupy similar stratigraphic locations in the sampled wells. 20 references, 7 figures, 11 tables