Tuesday, November 6, 2007
231-3

Spacial Distribution of Heavy Metals in the Soils of Erath County of Northern Central Texas.

Mahendra Dia, Weindorf David, Thompson Carol, and Cummings Hennen. Tarleton State University, Box T 0050, Stephenville, TX 76401

The presence of heavy metals in soils is a potential threat to plants, animals, humans and the environment. The soils of Erath County, Texas were examined to determine the spatial variability of heavy metals (Pb, Cd, Zn, Ni, and Cr) near the major highways (US-281, 376 and I-20) as well as unpaved county roads. We hypothesize that heavy metals generated from combustion of motor fuel have accumulated near road sides. However, their persistence in the soil varies with the nature, origin and type of the soil. The soil samples were collected along both sides of roads at distances of 10, 50 and 100 meters from the edge of the road, and at a depth of 0-6 and 6-12 inches. Anticipated results are that levels of Pb, Cd, Zn and Cr will be highest at the surface and decline with depth and/or distance from the road. Also, we will look for disproportionate distribution pattern of metal deposition tied to prevailing winds.