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Magnetic screening as a cost-effective and non-time-consuming approach has been successfully applied to wood biomass (wood chip and/or wood pellet) obtained from the trimming of the branches of roadside trees in Hiroshima Prefecture, Japan. It appears to be a suitable method for the contamination assessment of wood biomass. The heavy metal contents, magnetic susceptibility and saturation isothermal remanent magnetism (SIRM) of wood biomass specimens for 15 roadside sites and 1 forest site were measured. We measured 15 metals. Generally, the obtained content values were less than the European Standard EN 14961-2. However, the content values of some metals (Cu, Zn, Cd) slightly exceeded this standard for some samples. A simple correlation analysis revealed the existence of relationships and high correlations between magnetic parameters and metals such as Fe, Zn, Pb, Al, K and Cr. The specimens whose SIRMs are approximately 90 mA/m or more do not meet the specified Europe Standard. Specimens that have significantly positive values of magnetic susceptibility also do not meet the standard. It was shown that a simple inspection of heavy metal contamination in wood biomass can be performed by measuring its SIRM or magnetic susceptibility.

Magnetic Screening for Heavy Metal Pollution in the Wood Biomass Obtained from the Roadside Trees