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Leakages from underground storage tanks and accidental spills have led to contamination of soils and groundwater with organic solvents. Bio-monitoring (phyto- monitoring) uses plant tissue concentrations of organic pollutants in deep-rooted species of trees for low-cost assessment of the groundwater concentrations. Disadvantages of this approach include the limite d number of said tree species in the contaminated area, and the limited number of core samples that can be taken from a single tree before it dies. A so...