In soil toxicity

Li 2.5 Tolerated by most crops up to 5 mg L-1 mobile in soil. Toxic to citms at low concentrations (<0.075 mg L 1). Acts similarly to boron... 

Hickman, G. T., and J. T. Novak. 1987. Microcosm assessment of biodegradation rates of organic compounds in soils. Toxic Hazard. Wastes 19 153-62. 

Appearance Vapor Pressure and Saturated Air Concentration (at 20-25°C) Persistence In Soil Toxic Doses (for 70-kg man) Comments (see text for additional clinical description)... 

A number of studies have examined the role of various factors such as volatility and solubility on the efficacy of soil insecticides.(14) While the soil itself affects the efficacy of soil insecticides, the major determinate of biological activity is the amount of organic material in the soil.(15) Simmons, Lew, Silverman and Ali studied the effect of pyrethroids and some commercial insecticides on 3 instar southern com rootworm larva (Diabrotica undecimpunctata howardii).(16) They found that a combination of calculated lipophilicity and calculated volatility could predict soil pLCso based on the topical pLDso. The volatility was expressed as the log of the vapor pressure in nun Hg. We re-plotted the difference of the topical pLDso - soil pLCso with the calculated logP and calculated log volatility in a 3D graph shown in Figure 9. It can be seen as the compounds become more volatile (logVp < 5) that is a marked increase in soil toxicity. As the compounds become less lipophilic (more hydrophilic), they also become more toxic in the soil. 

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