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Occurrence of Naturally High Cadmium Levels in Soils and Its Accumulation by Vegetation¹

ABSTRACT

A survey of soils in the Santa Monica Mountains of Los Angeles and Venture Counties, Calif., was conducted to determine the relationship between parent materials and soil Cd contents. Twenty-four series were sampled and analyzed for Cd after digestion in 4N HNO₃. Residual soils developed from shale parent materials had the greatest Cd concentrations, with a mean of 7.5 µg/g, whereas soils developed from sandstone and basalt had the lowest Cd concentrations, with a mean of 0.84 µg/g. Alluvial soils with parent materials from mixed sources had an intermediate mean Cd content of 1.5 µg/g. A more extensive survey of the dominant soil series of the area was carried out and the Millsholm series, mapped in 30% of the area, was found to have a mean Cd content of 7.3 µg/g. A greenhouse vegetable study conducted with seven soils from the area, representing a range of Cd concentrations, showed that the Cd present naturally in these soils was absorbed by the vegetables in amounts sufficient to be of public health concern.

Key Words: soil classification • zinc • radish • Swiss chard • pepper • DTPA

¹ Contribution of the Dep. of Soil and Environmental Sciences, University of California, Riverside, CA 92521. Financial support of the Kearney Foundation of Soil Science is gratefully acknowledged.

² Associate Professor, Staff Research Associate, Professor, and Staff Research Associate, respectively, Dep. of Soil and Environ. Sci., Univ. of California, Riverside.

Received for publication January 29, 1981.

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