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The Phytotoxicity of Designated Pollutants

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Annual rept. no. 1. 1 Jul 1980-30 Jun 1981

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The phytotoxicity of gaseous hydrogen fluoride HF and jet fuel in vapor, spray and liquid states was investigated. The HF fumigation chamber and generating system was made operational, safe, and reliable. Plants exposed to 20-minute doses of HF gas developed typical foliar wilt, glazing, and necrosis dependent on gas concentration, plant species, and environment. Pictorial keys were constructed to aid in consistent grading of injured plants. Visible foliar response of six species to HF gas was comparable to their response to HC1 gas, but at smaller concentrations. Seed development was inhibited after exposure to HF under certain conditions. Literature concerning the effects of hydrocarbon fuels on plants was reviewed. Plants exposed to sprays and vapors of JP4 jet fuel developed water-soaked lesions and foliar necrosis depending on amount of fuel applied. The response of seeds to liquid fuel was tested. A toxic substance in jet fuel moved short distances horizontally across flats and vertically down through columns of soil. Watering or airing soil treated with jet fuel decreased phytotoxic response. Species differed in tolerance to the fuel. Initial studies indicated that shale-derived jet fuel was biologically more toxic than the same type of fuel derived from petroleum.

Subject Categories:

  • Biology
  • Air Pollution and Control

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