Cadmium pollution of agricultural soils peripheral to an industrial-urban complex

TL;DRAbstract

Soil Cd (1.0N HCl extract) was determined from soil samples taken at 256 sites at 3 soil depths within a 40 mile radius of a non-point pollution source (Houston-Galveston, Texas Complex) following prevailing wind-rose transects encompassing 8 counties, 46 soil series and measured as functions of soil pH, depth chroma, texture, drainage, carbonates, land use, distance and direction from non-point source. Surface soil Cd decreased with distance from source averaging 0.40 to 0.05 ppm within 5 to 40 miles radius respectively and generally follows prevailing wind patterns. For all soils, particularly fine-textured, Cd decreased with depth and markedly decreased at depths > 15 cm. Soil Cd correlated positively with pH. Fine-textured soils and carbonate soils held significantly more Cd than sandy and loamy soils. Well-drained soils with high chroma values held less Cd than poorly drained low chroma soils. Less Cd was found in forest soils than either cultivated or pastures and urban sites mos

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