Ontology type: schema:ScholarlyArticle
1988-08
AUTHORS ABSTRACTUsing the Arrhenius thermodynamic equation, which relates rates of processes to temperature through the quantity Ea, the ‘Heat (or Energy) of Activation’, we have evaluated the thermal relationships for several parameters of Hg cycling. It is shown that release from isolated leaves (shoots) of Hg0 is a two-step process with a higher Ea value below 21 °C than above (28 vs 14 kcal mol−1). Open field air Hg measurements over a mixed stand of grasses and other plants in volcanic soil show strikingly similar behavior to detached organs. Mercury release from volcanic soil was uniform over a wide temperature range, resembling plant and open field emissions above 18 to 21°C with anEa value of 13 kcal · mol−1. We conclude that Hg release below 18 to 21 °C is limited by a physiological process, whereas above that range, release is controlled by the physical process of vaporization itself. Plant concentration of total Hg from 5 to 33 °C (air temperature), is a more complex function involving direct accumulation and re-release of Hg0 from the atmosphere, release from tissue storage, and root uptake with reduction. More... »
PAGES443-448
http://scigraph.springernature.com/pub.10.1007/bf00163747
DOIhttp://dx.doi.org/10.1007/bf00163747
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