related processes will be investigated. For tracing the interaction of a soil pollutant
with plant systems (e.g. plant uptake of pesticides), also the rhizosphere needs to be
considered requiring sample depths down to 50–100 cm. Finally, if the potential for
groundwater contamination by soil pollutants are of interested, the total unsaturated
soil system down to aquifer has to be sampled.
sampling points
A
B
Fig. 2.6 Possible sampling strategy for analyzing river water affected by a point source
100 g
1 g
10 mg
5:5
≠
21:18
aliquots
Fig. 2.5 Scheme exemplifying the relationship between aliquotation and representativity of
samples
12
2 Sampling