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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
16/07/1999 |
Data da última atualização: |
16/07/1999 |
Autoria: |
LAABS, V.; AMELUNG, W.; ZECH, W. |
Título: |
Pesticides in soil, sediment, and water samples from a small microbasin in the Brazilian cerrados. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
In: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999. |
Páginas: |
p.203-214. |
Idioma: |
Inglês |
Conteúdo: |
The expansion of intensive agriculture in the tropics is leading to increasing concern about environmental pollution from pesticides in these regions. This study was conducted in the Brazilian savannas, also known as the Cerrados, near Uberlandia, to determine the magnitude of biocide concentrations in the small catchment of the Pantaninho stream and its reservoirs. Samples of soils, surface and well water, and sediments were collected on 10-12 December 1995, and analyzed for 15 herbicides and inseticides. In all surface-water samples, atrazine was detected at concentrations of 0.05-0.13 ug/L. The sampled well water (used for drinking) on farms did not contain detectable residues of biocides. Sediments, taken from the stream's banks, were contaminated at two sampling locations with either cyhalothrin (at 4.0 ug/kg) or simazine (at 3.2 ug/kg). Soil samples from maize fields usually showed higher concentrations of simazine, atrazine, and chlorpyrifos (ranging from 80 to 180 ug/ka at 18 to 35 days after application) than did those from soybean fields. Fluazifop-butyl, monocrotophos, and cyhalothrin were found 0-8 days after application at concentrations between 5 and 25 ug/kg. Carry-over residues of metolachlor, atrazine, simazine, cyanazine, and trifluralin were also detected at concentrations of around 2-15 ug/kg, indicating that pesticides can accumulate in tropical soils. Sampling at depth in a maize field proved that simazine and atrazine, although mainly restricted to the top 10-cm layer (40-120 ug/kg), are highly mobile, as was triazine, which was continuously detected at the maximum sampling depht (70 cm) in concentrations of 2-4 ug/kg. Although, when compared with temperate regions, these concentration levels of biocides were medium to low, they showed a potential for accumulation and leaching, which, over the long term, may lead to pollution of water resources. MenosThe expansion of intensive agriculture in the tropics is leading to increasing concern about environmental pollution from pesticides in these regions. This study was conducted in the Brazilian savannas, also known as the Cerrados, near Uberlandia, to determine the magnitude of biocide concentrations in the small catchment of the Pantaninho stream and its reservoirs. Samples of soils, surface and well water, and sediments were collected on 10-12 December 1995, and analyzed for 15 herbicides and inseticides. In all surface-water samples, atrazine was detected at concentrations of 0.05-0.13 ug/L. The sampled well water (used for drinking) on farms did not contain detectable residues of biocides. Sediments, taken from the stream's banks, were contaminated at two sampling locations with either cyhalothrin (at 4.0 ug/kg) or simazine (at 3.2 ug/kg). Soil samples from maize fields usually showed higher concentrations of simazine, atrazine, and chlorpyrifos (ranging from 80 to 180 ug/ka at 18 to 35 days after application) than did those from soybean fields. Fluazifop-butyl, monocrotophos, and cyhalothrin were found 0-8 days after application at concentrations between 5 and 25 ug/kg. Carry-over residues of metolachlor, atrazine, simazine, cyanazine, and trifluralin were also detected at concentrations of around 2-15 ug/kg, indicating that pesticides can accumulate in tropical soils. Sampling at depth in a maize field proved that simazine and atrazine, although mainly restricted to the... Mostrar Tudo |
Palavras-Chave: |
Sediment. |
Thesagro: |
Água; Bacia Hidrográfica; Cerrado; Oxisol; Pesticida; Poluição Ambiental; Sedimento; Solo. |
Thesaurus Nal: |
Ferralsols; pesticides; pollution; soil; water; watersheds. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02879naa a2200337 a 4500 001 1545413 005 1999-07-16 008 1999 bl uuuu u00u1 u #d 100 1 $aLAABS, V. 245 $aPesticides in soil, sediment, and water samples from a small microbasin in the Brazilian cerrados. 260 $c1999 300 $ap.203-214. 520 $aThe expansion of intensive agriculture in the tropics is leading to increasing concern about environmental pollution from pesticides in these regions. This study was conducted in the Brazilian savannas, also known as the Cerrados, near Uberlandia, to determine the magnitude of biocide concentrations in the small catchment of the Pantaninho stream and its reservoirs. Samples of soils, surface and well water, and sediments were collected on 10-12 December 1995, and analyzed for 15 herbicides and inseticides. In all surface-water samples, atrazine was detected at concentrations of 0.05-0.13 ug/L. The sampled well water (used for drinking) on farms did not contain detectable residues of biocides. Sediments, taken from the stream's banks, were contaminated at two sampling locations with either cyhalothrin (at 4.0 ug/kg) or simazine (at 3.2 ug/kg). Soil samples from maize fields usually showed higher concentrations of simazine, atrazine, and chlorpyrifos (ranging from 80 to 180 ug/ka at 18 to 35 days after application) than did those from soybean fields. Fluazifop-butyl, monocrotophos, and cyhalothrin were found 0-8 days after application at concentrations between 5 and 25 ug/kg. Carry-over residues of metolachlor, atrazine, simazine, cyanazine, and trifluralin were also detected at concentrations of around 2-15 ug/kg, indicating that pesticides can accumulate in tropical soils. Sampling at depth in a maize field proved that simazine and atrazine, although mainly restricted to the top 10-cm layer (40-120 ug/kg), are highly mobile, as was triazine, which was continuously detected at the maximum sampling depht (70 cm) in concentrations of 2-4 ug/kg. Although, when compared with temperate regions, these concentration levels of biocides were medium to low, they showed a potential for accumulation and leaching, which, over the long term, may lead to pollution of water resources. 650 $aFerralsols 650 $apesticides 650 $apollution 650 $asoil 650 $awater 650 $awatersheds 650 $aÁgua 650 $aBacia Hidrográfica 650 $aCerrado 650 $aOxisol 650 $aPesticida 650 $aPoluição Ambiental 650 $aSedimento 650 $aSolo 653 $aSediment 700 1 $aAMELUNG, W. 700 1 $aZECH, W. 773 $tIn: THOMAS, R.; AYARZA, M.A., ed. Sustainable land management for the oxisols of the Latin American savannas: dynamics of soil organic matter and indicators of soil quality. Cali: CIAT, 1999.
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Embrapa Cerrados (CPAC) |
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Registros recuperados : 86 | |
3. | | LEHMANN, J.; CRAVO, M.; ZECH, W. Single tree effects on soil organic matter. In: SHIFT PROJECT ENV 45 (Manaus-AM). Water and nutrient fluxes as indicators for the stability of different land use systems on the terra firme near Manaus. Manaus: EMBRAPA-CPAA : BMBF, 1997. p. 58-66.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Amazônia Ocidental. |
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8. | | STEINER, C.; TEIXEIRA, W. G.; ZECH, W. The effect of charcoal in banana (Musa sp.) planting holes - an on-farm study in Central Amazonia, Brazil. In: WOODS, W. I.; TEIXEIRA, W. G.; LEHMANN, J.; STEINER, C.; WINKLERPRINS, A.; REBELLATO, L. (Ed.). Amazonian dark earths: Wim Sombroek's vision. Berlin: Springer, 2009. p. 423-432.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Amazônia Ocidental. |
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11. | | STEINER, C.; GARCIA, M.; ZECH, W. Effects of charcoal as slow release nutrient carrier on N-P-K dynamics and soil microbial population: pot experiments with Ferralsol substrate. In: WOODS, W. I.; TEIXEIRA, W. G.; LEHMANN, J.; STEINER, C.; WINKLERPRINS, A.; REBELLATO, L. (Ed.). Amazonian dark earths: Wim Sombroek's vision. Berlin: Springer, 2009. p. 325-338.Tipo: Capítulo em Livro Técnico-Científico |
Biblioteca(s): Embrapa Amazônia Ocidental. |
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Registros recuperados : 86 | |
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