Contaminant-Induced Irreversible Changes in Groundwater Chemistry - Contaminant Geochemistry - page 476

Table 17.5 Half-lives of selected herbicides in groundwater (Cavaller et al. 1991 ). Reprinted
from Cavaller et al. ( 1991 ). Copyright 1991 with permission of John Wiley and Sons
Herbicide R 2 Storage temp C Concentration (lg/L) t (est.) (d)

Alachlor 15 1.0 1518 0.644

15 5.0 1446 0.851

22 1.0 1409 0.693

22 5.0 808 0.815

Metolachlor 15 1.0 749 0.675

15 5.0 1074 0.797

22 1.0 857 0.724

22 5.0 548 0.894

Propanil 15 1.0 275 0.837

15 5.0 215 0.871

22 1.0 259 0.881

22 5.0 196 0.868

Dichlorprop 15 1.0 1235 0.892

15 5.0 824 0.857

22 1.0 1286 0.763

22 5.0 196 0.898

2,4-D 15 1.0 831 0.757

15 5.0 1907 0.857

22 1.0 982 0.763

22 5.0 969 0.896

Fig. 17.19 Frequencies of detection of pesticide compounds in shallow groundwater reported in
41 land-use studies, adjusted to a common detection threshold of 0.01 lg/L (Kolpin et al. 1998 ).
Reprinted with permission Kolpin et al. ( 1998 ). Copyright (1998) American Chemical Society