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Carrot

Lettuce

Potato

Apple tree

Carrot

Lettuce

Potato

Apple tree

Gas ^exchange

^^ Considered I Not considered

Figure 1. Principles of crop-specific plant uptake models.

Gas ^exchange

^^ Considered I Not considered

Figure 1. Principles of crop-specific plant uptake models.

Example compound: Benzo(a)pyrene (BaP) is used as example for the calculations. BaP is a polycyclic aromatic hydrocarbon (PAH). It is one of the strongest carcinogens registered. Its sources are incomplete burning processes from heating, traffic, industry, and smoking. It occurs practically everywhere in the environment. BaP is very lipophilic (characterized by the partition coefficient between n-octanol and water KOW, log KOW = 6.13) and semivolatile (characterized by the partition coefficient between air and water, Kaw, also known as dimensionless Henry's Law Constant, KAW = 1.39 x 10-5) [9].

1. Chemical equilibrium

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