pyrethroid deposition under cages dominated mainly by the hydrodynamics of each
study site. These pyrethroid concentrations were comparable with those in previous
studies (Table 6), with cypermethrin ranges close to those reported in Scotland
[80, 81], but lower than those reported in Chile.
Table 5 Pyrethroid concentrations (ng g
À1
, d.w.) in sediment from the northern Chilean Patagonia
Farm
Treatment
Distance (m)
Mean Æ SD (n)
Range
SF-1
DE
0
2.15 Æ 1.21 (4)
1.16–3.83
100
2.23 Æ 1.56 (6)
0.46–4.67
500
0.96 Æ 0.59 (11)
0.37–2.41
0–500
1.55 Æ 1.19
0.37–4.67
SF-2
CP
0
1.48 Æ 2.28 (3)
0.13–4.11
100
0.52 Æ 0.77 (6)
0.13–2.09
500
0.49 Æ 0.12 (6)
0.36–0.71
0–500
0.70 Æ 1.06
0.13–4.11
SF-3
DE
0
0.72 Æ 0.78 (6)
0.07–2.04
100
0.71 Æ 0.65 (7)
0.09–1.98
500
1.60 Æ 2.35 (11)
0.15–6.24
0–500
1.12 Æ 1.69
0.07–6.24
SF-4
CP
0
0.06 Æ 0.05 (4)
0.02–0.13
100
0.06 Æ 0.04 (3)
0.03–0.10
500
0.10 Æ 0.11 (11)
0.02–0.37
0–500
0.08 Æ 0.09
0.02–0.37
Table 6 Comparative analysis of pyrethroid concentration levels detected in this study and those in
previous published reports
Pyrethroid
Country
Concentration (ng g
À1
, d.w.)
Reference
Cypermethrin
Scotland
0.03–7.20
[80, 81]
Norway
<15.00
[29]
Chile
18.00 to 1,323.70
[77]
Chile
0.02–4.11
This study
Deltamethrin
Norway
<15.00
[29]
Chile
<10.40
[77]
Chile
390.00–1,020.00
[78]
Chile
0.07–6.24
This study
Bold values are the data obtained in the frame of this research, while the other data are from the
literature search
194
F. Tucca and R. Barra