Emerging contaminants in groundwater - NERC Open Research ...

OR/11/013
Log DT 50 water/sediment
4
3
2
1
0
‐1
‐2
0 1 2 3 4 5 6 7 8
Log K oc
Figure 4.4 Classification of leaching probability of all compounds using Koc and DT50 (after Worrall
et al, 2000). Compounds in red assessed as leachers
Log DT 50 water/sediment
4
3
2
1
0
‐1
‐2
0 1 2 3 4 5 6 7 8
Log K oc
Figure 4.5 Classification of leaching probability of final list compounds using Koc and DT50 (after
Worrall et al, 2000)
A classification similar to that proposed by Worrall et al. (2000) was applied, as shown in
Figure 4.4, where points along a diagonal line have a similar estimated leaching probability.
The line shown is a cut-off between leachers and non-leachers. This was used as Test 4 (see
Table 4.2). Values close to the line have been assessed as leachers. Compounds were assessed
as non-leachers where Log Koc > 4, Log DT50 100,000 ha and/or Weight applied >20,000 kg”. This left the 65
compounds shown in Figure 4.5 and listed in Table 4.3. Compounds meeting all five criteria
assessed as having the highest leaching hazard.
17