Copper… on the one hand copper is an important trace element for life (for example as part of the red blood cells), on the other hand it is toxic. Water-soluble copper in inshore waters and soil is a danger for many microorganisms and plants. Therefore, it is important to understand the dispersion of water-soluble copper. When you add water-soluble copper (Cu) into soil, it instantly partitions between solid and solution phases. However, this state is not stable: with increasing “age”, its lability (bioavailability, toxicity, isotopic exchange-ability and extractability) decreases because of diffusion and reactions with the surrounding material. Theoretical models help to predict this time dependent change in lability, which depends on a lot of soil parameters like temperature, soil organic matter content and soil pH. Zeng, et al. (2017) published an improved model for copper lability which describes short and long term effect of water-soluble copper added to soil in one single model. In their model, copper lability depends on three processes:
The model showed good predicting ability when compared to experimental data of different soil samples with different chemical properties (like pH value, clay and organic carbon content and copper concentration), although other copper ageing processes like moisture, plant absorption, and microbial activities are not considered. "A new model integrating short- and long-term aging of copper added to soils"
Zeng S, Li J, Wei D, Ma Y (2017) PLOS ONE 12(8): e0182944.
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