Table 1. Pesticides and Degradation Products Included in This Studya,b,c,d.
| compound (abbreviation) | parent compounds | CAS no. | sale period | KfOC (mL g–1) | DT50 (days) | no. of well screens in the final data set (number of sample years) |
|---|---|---|---|---|---|---|
| atrazine (A) | 1912-24-9 | 1960–1994 | 70–429 (174) | 6–150 (75) | 298 (9) | |
| simazine (B) | 122-34-9 | 1957–2004 | 124–1585 (750) | 27–102 (60) | 298 (9) | |
| cyanazine (C) | 21725-46-2 | 1973–1996 | 30–427e (190) | 12–25 (16) | ||
| terbuthylazine (T) | 5915-41-3 | 1972–1996 | 151–333 (231) | 6–167 (72) | ||
| desethylatrazine (DEA) | A | 6190-65-4 | 79–110 (110) | 45–170 (45) | 298 (9) | |
| desisopropylatrazine (DIA) | A, S, C, T | 1007-28-9 | 130 | 298 (9) | ||
| desethyldesisopropylatrazine (DEIA) | A, S, C, T | 3397-62-4 | 298 (9) | |||
| 2,6-dichlorobenzamide | dichlobenil, chlorthiamid | 2008-58-4 | dichlobenil (1969–1996); chlorthiamide (1965–1980) | 31–51 (41) | 73–1848 (138) | 298 (9) |
| bentazon | 25057-89-0 | 1974 | 3–158 (60) | 3–35 (20) | 298 (9) |
a
Degradation products are shown in italic.
b
KfOC is the Freundlich sorption isotherm normalized to soil organic carbon.
c
DT50 is the half-life in topsoil.
d
KfOC and DT50 are all from the Pesticide Properties Database (https://sitem.herts.ac.uk/aeru/ppdb/).
e
Koc instead of Kfoc.