bifenthrin responsible for most of the toxicity in half of sediments and also attributed
urbanization rather than agriculture as responsible for its emission [59].
In Southern America (Argentina), cyhalothrin was the dominant pyrethroid in
sediments of rivers flowing through large monocultural horticultural fields [45]. The
percentage of detected herbicides and pesticides varied seasonally according to their
application, while pyrethroid residues were consistently detected in sediments,
attesting for an environmental risk for the benthic biota.
An increasing body of literature evidences pyrethroid occurrence in Asian riverbed sediments and shows the prevalence of cypermethrin at many sites (Table 2). In
large cities of Vietnam, permethrin was the dominant pyrethroid, and its geographical repartition brings evidences that it is sourced by structural and householding
uses and disease vector controls rather than agricultural spraying [47]. Deltamethrin
was only detected once in this study but at very high levels from an undetermined
source. In Southern China, cypermethrin, cyhalothrin, permethrin, and deltamethrin
dominate over other pyrethroids in sediments of the Pearl River; their concentrations
may reach notably high values in small creek sediments collected upstream in the
river [49]. Cypermethrin and permethrin also dominate in sediments from an urban
creek, close to Guangzhou (Southern China, [25, 61]). In Beijing GuanTin reservoir,
fenvalerate and deltamethrin were the dominant pyrethroids [24]. In Pakistan
deltamethrin and permethrin were the dominant pyrethroids, with deltamethrin
present in all samples and reaching concentrations above environmental quality
thresholds (namely, NOEC of Hyalella azteca [26]).
Australia’s state Queensland has a low population and sugarcane and cotton
cultivation dominate its agricultural activities. Ametryn and prometryn were the
most frequent pyrethroids detected in sediments from irrigation drains and channels,
reaching high concentration levels, while bifenthrin occurred in only one cotton
production area [46].
In Europe, cyhalothrin and cypermethrin are ubiquitous at large river mouths,
whereas riverbed sediment also showed frequent amounts of bifenthrin and
tefluthrin, together with cypermethrin and cyfluthrin in some rivers of Italy and
France [62]. In sediments of the Ebro Delta (Spain), cypermethrin was detected in
some sediments, whereas deltamethrin, detected in the water, was below detection
limits in the sediments [28]. In contrast, cypermethrin, cyfluthrin, and esfenvalerate
were abundant in the paddy fields of Albufera de Valencia [30]. These paddy fields
are filled with water coming from a lake receiving agricultural and urban effluents,
and both surface water and groundwater contained high levels of dissolved phase
pyrethroids.
Similarly to the reports of seawater concentrations, pyrethroid abundances in
marine sediments are evaluated by a limited number of comprehensive studies. In an
intensely urbanized estuary in Southern California, bifenthrin and cyfluthrin were
the most frequently detected pyrethroids with their highest concentrations at 132 and
65 ng/g, respectively, at sites located near sources of runoff emissions from urban
watersheds. They accounted for a part of the toxicity of the sediments to a standard
amphipod Eohaustorius estuarius; however they were not the major toxicant at all
the studied stations [52]. Samples with the highest concentrations of pyrethroids
Fate of Pyrethroids in Freshwater and Marine Environments
93
urbanization rather than agriculture as responsible for its emission [59].
In Southern America (Argentina), cyhalothrin was the dominant pyrethroid in
sediments of rivers flowing through large monocultural horticultural fields [45]. The
percentage of detected herbicides and pesticides varied seasonally according to their
application, while pyrethroid residues were consistently detected in sediments,
attesting for an environmental risk for the benthic biota.
An increasing body of literature evidences pyrethroid occurrence in Asian riverbed sediments and shows the prevalence of cypermethrin at many sites (Table 2). In
large cities of Vietnam, permethrin was the dominant pyrethroid, and its geographical repartition brings evidences that it is sourced by structural and householding
uses and disease vector controls rather than agricultural spraying [47]. Deltamethrin
was only detected once in this study but at very high levels from an undetermined
source. In Southern China, cypermethrin, cyhalothrin, permethrin, and deltamethrin
dominate over other pyrethroids in sediments of the Pearl River; their concentrations
may reach notably high values in small creek sediments collected upstream in the
river [49]. Cypermethrin and permethrin also dominate in sediments from an urban
creek, close to Guangzhou (Southern China, [25, 61]). In Beijing GuanTin reservoir,
fenvalerate and deltamethrin were the dominant pyrethroids [24]. In Pakistan
deltamethrin and permethrin were the dominant pyrethroids, with deltamethrin
present in all samples and reaching concentrations above environmental quality
thresholds (namely, NOEC of Hyalella azteca [26]).
Australia’s state Queensland has a low population and sugarcane and cotton
cultivation dominate its agricultural activities. Ametryn and prometryn were the
most frequent pyrethroids detected in sediments from irrigation drains and channels,
reaching high concentration levels, while bifenthrin occurred in only one cotton
production area [46].
In Europe, cyhalothrin and cypermethrin are ubiquitous at large river mouths,
whereas riverbed sediment also showed frequent amounts of bifenthrin and
tefluthrin, together with cypermethrin and cyfluthrin in some rivers of Italy and
France [62]. In sediments of the Ebro Delta (Spain), cypermethrin was detected in
some sediments, whereas deltamethrin, detected in the water, was below detection
limits in the sediments [28]. In contrast, cypermethrin, cyfluthrin, and esfenvalerate
were abundant in the paddy fields of Albufera de Valencia [30]. These paddy fields
are filled with water coming from a lake receiving agricultural and urban effluents,
and both surface water and groundwater contained high levels of dissolved phase
pyrethroids.
Similarly to the reports of seawater concentrations, pyrethroid abundances in
marine sediments are evaluated by a limited number of comprehensive studies. In an
intensely urbanized estuary in Southern California, bifenthrin and cyfluthrin were
the most frequently detected pyrethroids with their highest concentrations at 132 and
65 ng/g, respectively, at sites located near sources of runoff emissions from urban
watersheds. They accounted for a part of the toxicity of the sediments to a standard
amphipod Eohaustorius estuarius; however they were not the major toxicant at all
the studied stations [52]. Samples with the highest concentrations of pyrethroids
Fate of Pyrethroids in Freshwater and Marine Environments
93