Distribution and Speciation of Heavy Metal(loid)s in Soils under Multiple Preservative-Treated Wooden Trestles.

Lateral Distribution of Cr, As, and Cu in Surface Soils The distribution of Cr in the soils at a distance within 0 and 1 m near all treatment boardwalks in this study showed a decreasing trend in the horizontal direction ( Figure 3 a).

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Overall, the proportions of each fraction in the soil profiles with four preservative treatments were in the following order of magnitude: residual > oxidizable > reducible > exchangeable, indicating that the residual fraction was still dominant and expressed an increasing trend with increasing profile depth, although the Cr in the residual fraction decreased compared with the background profiles ( Figure 7 b–e).

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