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Fluoride Accumulation by Forage: Continuous vs. Intermittent Exposures to Hydrogen Fluoride¹

ABSTRACT

The pattern of fumigation with gaseous HF markedly affects the rate and amount of F accumulated by timothy (Phleum pratense L.) and red clover (Trifolium pratense L.) plants. F accumulation was greater after continuous fumigations than when the same HF dose was provided in alternate 48-hour exposures. The importance of the intermittent nature of exposures in addition to the pollutant concentration and duration of exposure in governing F accumulation suggests that pollution abatement action to protect livestock from ingested F should be based on the F content of forage rather than the concentration of airborne fluorides.

Key Words: fluorosis • Phleum pratense • Trifolium pratense

¹ Contribution from the Boyce Thompson Institute for Plant Research, Yonkers, N. Y. 10701. This work was financed in part with Federal funds from the Environmental Protection Agency under grant R-801070. The contents do not necessarily reflect the views and policies of the EPA, nor does mention of trade names or commercial products constitute endorsement or recommendation for use. We thank D. C. McCune for helpful suggestions.

² Associate Plant Physiologist and Research Associate, respectively.

Received for publication February 15, 1973.