Skip to main content
padlock icon - secure page this page is secure

Pesticides and nitrates in groundwater from oriziculture areas of the ‘Baixo Sado' region (Portugal)

Buy Article:

$61.00 + tax (Refund Policy)

The aim of this study was the groundwater evaluation to pesticide compounds and nitrates in oriziculture areas of the ‘Baixo Sado' region (Portugal), based on their use, predictive approaches, and field and laboratory work. One or more of the pesticide compounds analysed (chlorfenvinphos, cycloxydim, 3,4-dichloroaniline, endosulphan, MCPA, molinate, oxadiazon, profoxydim, propanil) were detected in 62% of 171 water samples collected from 22 wells used for public supply, domestic supply, and irrigation, during 2002 and 2003. From the total samples, 6% presented maximum concentration levels of at least one of the compounds above 0.1µgL −1 . Mixtures of pesticide compounds were observed in 25% of the total groundwater samples, with up to five substances being detected in each one. The concentration sum of all was above 0.5µgL −1 in four water samples. All the analysed compounds, with the exception of the insecticide chlorfenvinphos, occurred in groundwater. Molinate was the most frequently detected (55%), particularly with maximum concentration levels above 0.1µgL −1 . Detection frequencies were higher in water samples collected from irrigation wells (78%). Groundwater exposure to total pesticides and nitrates was analysed. Maximum concentration levels were 59.6µgL −1 and 183mgL −1 respectively. A seasonal variation pattern could be observed for both parameters in water samples collected from some wells. The results from this study show that sustainable use of pesticides and nitrogen fertilizers is required in order to achieve an overall contamination reduction from these compounds in the aquatic environment.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: Groundwater; Nitrates; Pesticides; Portugal; Rice

Document Type: Research Article

Affiliations: 1: Universidade Técnica de Lisboa, Instituto Superior de Agronomia (DPPF), Tapada da Ajuda 1340-017, Lisbon, Portugal 2: Instituto do Ambiente, Rua da Murgueira, 9/9A 2610-124 Amadora, Portugal

Publication date: November 15, 2006

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more