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Fate of Pyrethroids in Farmland Ponds
10 Physicochemical characteristics, part II
The physicochemical characteristics are summarised in this chapter. The basic chemical properties are shown in Table 10.1 and the more environment related test parameters are shown
in Table 10.2.
Table 10.1
Basic substance characteristic (Linders et al., 1995, Spliid and Mogensen 1995).
Grundlæggende stof parametre (Linders et al., 1995, Spliid and Mogensen 1995).
| Substance |
Molecular Weight
MW
(g/mol)
|
Solubility
Sw
(μg/l)
|
Vapor pressure
Psat
(Pa)
|
Log octanol/water distribution coefficient
log Kow
|
| deltamethrin |
505.2 |
<2 |
4e-8 |
5.4 |
| fenvalerate |
419.9 |
16 |
2.3e-5 |
4.4-5 |
| fenpropathrin |
349.4 |
330 |
7.3e-4 |
5.08 |
| permethrin |
391.3 |
200 |
4.5e-5 |
6.5 |
The low solubilities and high log Kow values indicate that all the substances are hydrophilic. However, some variations between the values are noted.
Table 10.2
Environmental behaviour (Linders et al., 1995).
Miljø-parametre (Linders et al., 1995).
| Substance |
DT50 (days) |
Kom (l/kg) |
Photo degradation |
| |
Soil |
Sediment / water system |
Soil |
Sediment / water system |
DT50
(days)
|
| Deltamethrin |
18-30 |
|
>476 |
|
|
| Fenvalerate |
30-135 |
|
1100-1600 |
|
3.5-15 |
| Fenpropathrin |
13-54 |
<28 |
443-2712 |
|
19-95 |
| Permethrin |
13 |
<23-57 |
126-554 |
|
0.8-1.1 |
The values in Table 10.2 must be interpreted with caution, since only few data are available and they are subject to a very large uncertainties partly due to the variability in the
environment. However, in general the adsorption to organic matter seems high and some photo and chemical/microbiological degradation may take place.
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Version 1.0 September 2004, © Danish Environmental Protection Agency
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