Pesticide occurrence in groundwater near irrigated rice fields

Submitted by Paula Gautério (paulaporto_g@hotmail.com) on 2014-02-12T22:33:17Z No. of bitstreams: 1 Ocorrência de agrotóxicos em águas subterrâneas de áreas adjacentes a lavouras de arroz irrigado.pdf: 223427 bytes, checksum: f1e4d4c15ed0f3dee9e8151907dcf25c (MD5)Approved for entry into archive by Gabriela Silva da Rosa (gabrielasilvadarosa@gmail.com) on 2014-02-22T21:18:33Z (GMT) No. of bitstreams: 1 Ocorrência de agrotóxicos em águas subterrâneas de áreas adjacentes a lavouras de arroz irrigado.pdf: 223427 bytes, checksum: f1e4d4c15ed0f3dee9e8151907dcf25c (MD5)Made available in DSpace on 2014-02-22T21:18:33Z (GMT). No. of bitstreams: 1 Ocorrência de agrotóxicos em águas subterrâneas de áreas adjacentes a lavouras de arroz irrigado.pdf: 223427 bytes, checksum: f1e4d4c15ed0f3dee9e8151907dcf25c (MD5) Previous issue date: 2011The objective this study was to monitor pesticide residues in groundwater at three different times and in seven regions producing rice in southern Brazil, in the 2007/08 season. Imazethapyr and fipronil were found in all regions studied. All groundwater samples from the Planície Costeira Interna to Lagoa dos Patos and Santa Catarina contained at least one pesticide. The lowest number of contaminated samples were detected in the Southern region. The highest frequency of contaminated samples was found after drainage of the rice fields. Only fipronil exceeded limits of potability, in 27% of samples, according European Community criteria