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All soil metals are predominantly associated with organic matter (50%) which reduces their bioavailibility and thus their risk for ecological and human health. The Cu isotope data show that Cu in soil organic matter is enriched in 65Cu, while the lighter isotopes (63Cu) remain in the dissolved bioavailable Cu fraction (Δ65Cuorganic-bioavailable is +0.12 ± 0.13‰). This suggests the preferential complexation of 65Cu with soil organic matter after dissolution of Cu deposited to the soil. Thus, Cu isotope data can effectively indicate p
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