Mined Land Reclamation Using Polluted Urban Navigable Waterway Sediments: I. Trace Metals1
- A. van Luik2
As part of a study assessing the suitability of sediments from the Calumet-Sag Channel, Illinois (Cal-Sag), for use as a mined land reclamation medium, the concentrations of 11 trace metals were determined in 34 sediment samples representing 10 cores. The cores were taken at 2.4-km intervals along the length of the Cal-Sag using a gravity corer. The cores (107 to 173 cm in length) were divided into sections representing approximately 30 to 50 cm of core depth each. Each of these sections was sampled by compositing a sample from along its length. Silt and clay content were determined in addition to the concentrations of the 11 trace metals. Trends in the metal concentration data suggested that As and Hg had a different source and/or history in the Cal-Sag sediments than Ba, Cd, Cr, Cu, Pb, and Zn. Nickel, selenium, and silver levels were determined for 10 of the samples. Implications of trace metal levels in terms of using Cal-Sag sediments as a plant-growth medium in mined land reclamation are discussed. Zinc levels may preclude use of Cal-Sag sediments for the production of some specific Zn-sensitive agronomic crops and may require longterm monitoring after placement in productive use to allow management of potential Zn phytotoxicity. Mean total trace metal concentration values for this Cal-Sag sediment sampling were (mg/kg): As, 19; Ba, 320; Cd, 9.4; Cr, 110; Cu, 120; Pb, 510; Hg, < 0.42; Ni, 38; Se, 0.10; Ag, 4.9; and Zn, 2580.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © . .