pyrethroids in water, particles and sediments of freshwater and marine
environments, and the underlying partition and transport processes between those
phases. Pyrethroids are often applied to water bodies, and after introduction to the
dissolved phase, they partition between the different environmental compartments,
being subjected to a number of sinks, particularly degradation. The elucidation of the
occurrence, partition, and sinks of pyrethroids will allow to identify research lines
that would help to better constraint the environmental risk associated to pyrethroids
and to orientate protection measures.
2 Pyrethroid Sources and Emissions in Surface and Marine
Water Bodies
Because of their wide spectrum of targets, pyrethroids are used in a variety of
applications; agriculture and urban householding pest control compose two of the
major market shares. Accurate estimates of their use are made difficult because
nonprofessional uses are often not reported and by off the counter sales. The use of
pyrethroids by aquaculture activities leads to important amounts of pyrethroids
directly released to the marine environment, which can be important in specific
marine areas [5, 6]. Overall, pyrethroids represent more than one third of the
insecticide market, with a worldwide annual use of active ingredients around
7,000 tons per year between 1990 and 2013 (with peaks above 12,000 tons in
1997 and 2012) [7].
Structural and householding usages constitute an important part of the pyrethroid
market. Several studies report that these compounds are not completely eliminated in
conventional wastewater treatment plants (WWTPs) [8, 9], and thus they can be
introduced into the environment through WWTPs effluents. Pyrethroids from urban
sources were identified as the cause of toxicity in 80% of river sediments in the
vicinity of the city of Salinas in Southern California [10].
3 Occurrence and Composition of Various Pyrethroids
in Water Ecosystems
In order to estimate the potential impact of pyrethroids on aquatic environments,
research projects and monitoring programs have surveyed pyrethroid occurrence
mostly in the vicinity of agricultural and urban areas concerned by pyrethroid
primary use. California is the world location from which more data are available
as a result of numerous monitoring programs setup at the municipal to state level
[11]. As a result of their affinity for organic matter, pyrethroids have been detected
both in the water phase and in the sediments. Table 1 reviews water concentrations of
pyrethroid in the current literature, and Table 2 reports their levels in sediments.
Fate of Pyrethroids in Freshwater and Marine Environments
83
environments, and the underlying partition and transport processes between those
phases. Pyrethroids are often applied to water bodies, and after introduction to the
dissolved phase, they partition between the different environmental compartments,
being subjected to a number of sinks, particularly degradation. The elucidation of the
occurrence, partition, and sinks of pyrethroids will allow to identify research lines
that would help to better constraint the environmental risk associated to pyrethroids
and to orientate protection measures.
2 Pyrethroid Sources and Emissions in Surface and Marine
Water Bodies
Because of their wide spectrum of targets, pyrethroids are used in a variety of
applications; agriculture and urban householding pest control compose two of the
major market shares. Accurate estimates of their use are made difficult because
nonprofessional uses are often not reported and by off the counter sales. The use of
pyrethroids by aquaculture activities leads to important amounts of pyrethroids
directly released to the marine environment, which can be important in specific
marine areas [5, 6]. Overall, pyrethroids represent more than one third of the
insecticide market, with a worldwide annual use of active ingredients around
7,000 tons per year between 1990 and 2013 (with peaks above 12,000 tons in
1997 and 2012) [7].
Structural and householding usages constitute an important part of the pyrethroid
market. Several studies report that these compounds are not completely eliminated in
conventional wastewater treatment plants (WWTPs) [8, 9], and thus they can be
introduced into the environment through WWTPs effluents. Pyrethroids from urban
sources were identified as the cause of toxicity in 80% of river sediments in the
vicinity of the city of Salinas in Southern California [10].
3 Occurrence and Composition of Various Pyrethroids
in Water Ecosystems
In order to estimate the potential impact of pyrethroids on aquatic environments,
research projects and monitoring programs have surveyed pyrethroid occurrence
mostly in the vicinity of agricultural and urban areas concerned by pyrethroid
primary use. California is the world location from which more data are available
as a result of numerous monitoring programs setup at the municipal to state level
[11]. As a result of their affinity for organic matter, pyrethroids have been detected
both in the water phase and in the sediments. Table 1 reviews water concentrations of
pyrethroid in the current literature, and Table 2 reports their levels in sediments.
Fate of Pyrethroids in Freshwater and Marine Environments
83