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Tungsten Content of Soils, Plants, and Sewage Sludges in Iowa

Department of Agronomy, Iowa State Univ., Ames, IA 50011.

^* Corresponding author.

ABSTRACT

Information on the W content in environmental matrices is desired. Because of the antagonistic effect of W on Mo nutrition of plants and microorganisms, this study was conducted to assess the concentration of W in soils, plant materials, and sewage sludges in Iowa. Results showed that the total W in 18 soils ranged from 0 to 2 mg kg^–1, with mean and median values of 0.89 and 0.88 mg kg^–1, respectively. The corresponding values for 22 plant materials ranged from 0 to 0.35 mg kg^–1, with mean and median values of 0.18 and 0.17 mg kg^–1. Analysis of 44 sewage sludge samples from different wastewater-treatment plants in Iowa showed that the concentration of this element varied from 0.5 to 62 mg kg^–1, with mean and median values of 4.3 and 2.2 mg kg^–1, respectively.

Key Words: Heavy metals • Trace elements • Molybdenum

Projects 2112 and 2710. Journal Paper no. J-12611 of the Iowa Agric. and Home Economics Exp. Stn.

Received for publication March 5, 1987.