Residues of pesticides and some metabolites in dissolved and particulate phase in surface stream water of Cachapoal River basin, central Chile

In the last twenty years, pesticide use in Chile has increased more than 160%, generating a greater risk of water resources pollution. The objective of this study was to assess the presence of 22 pesticides and 12 degradation products in surface water samples from the Cachapoal River basin, Central...

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Veröffentlicht in:Environmental pollution (1987) Jg. 251; S. 90 - 101
Hauptverfasser: Climent, María José, Herrero-Hernández, Eliseo, Sánchez-Martín, María Jesús, Rodríguez-Cruz, María Sonia, Pedreros, Pablo, Urrutia, Roberto
Format: Journal Article
Sprache:Englisch
Veröffentlicht: England Elsevier Ltd 01.08.2019
Schlagworte:
agricultural land
atrazine
Chile
cyprodinil
diazinon
Dissolved phase
dry season
imidacloprid
metabolites
Particulate phase
pesticide residues
Pesticides residues
Pollution
pyrimethanil
risk
rivers
solid phase extraction
spatial variation
streams
Surface water
tebuconazole
temporal variation
water quality
watersheds
Chile
Pesticides residues
Pollution
Particulate phase
Dissolved phase
Surface water
ISSN:0269-7491, 1873-6424, 1873-6424
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Zusammenfassung:In the last twenty years, pesticide use in Chile has increased more than 160%, generating a greater risk of water resources pollution. The objective of this study was to assess the presence of 22 pesticides and 12 degradation products in surface water samples from the Cachapoal River basin, Central Chile, an area characterized by intense agricultural activity. Pesticide concentrations in the dissolved phase (DP) and particulate phase (PP) in samples collected in the dry season and after precipitation events was assessed. The solid-phase extraction technique was used to preconcentrate the samples and GC/MS and LC/MS were used to detect pesticides. The results present spatio-temporal variations in the proportion and concentration of pesticides and their degradation products in both the DP and PP for each site and sampling period. The most ubiquitous compounds in the dissolved phase were atrazine, atrazine-2-hydroxy (HA), cyprodinil, pyrimethanil, and tebuconazole, while in the particulate phase HA, imidacloprid, diazinon and pyrimidinol were detected. The results presented in this study make up the first record of pesticides in the dissolved and particulate phases in surface water in Chile. They show that the problem of pesticide contamination undoubtedly affects the quality of bodies of water in agricultural areas in Chile and support the need for a proper assessment of the water quality of the Cachapoal River in the future. [Display omitted] •First study in Chile that reveals the occurrence of pesticides in the particulate phase of aqueous samples.•Acephate, DIHA, diuron and pyrimethanil, highest concentrations in dissolved phase.•Triazine-derived degradation products, highest concentrations in particulate phase.•Increase in number of detected pesticides in dissolved phase from upper to lower area of Cachapoal River basin.•It is necessary evaluate the possible pollution of groundwater because can it be used for domestic purposes. The occurrence of pesticides in the dissolved and particulate phase of aqueous samples in the main agricultural region of Chile was revealed. Water samples of Cachapoal River basin were evaluated in the dry season and after precipitation events.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0269-7491
1873-6424
1873-6424
DOI:10.1016/j.envpol.2019.04.117