Monitoring of pesticides and polycyclic aromatic hydrocarbons in water from Paraíba do Sul River, Brazil

Abstract

Estudou-se a qualidade da água do Rio Paraíba do Sul através da determinação das concentrações de alguns poluentes orgânicos prioritários, a saber, hidrocarbonetos policíclicos aromáticos (HPAs) e pesticidas. The Paraíba do Sul River, in the State of Rio de Janeiro, was studied for its water quality, by determining the levels of selected polycyclic aromatic hydrocarbons (PAHs) and pesticides from six sites in two cities, Resende and Campos dos Goytacazes, as they have industrial and agricultural activities. This study was carried out between July 2001 and March 2002. The method involved 200 mL samples taken by off-line, solid phase extraction by OASIS polymeric cartridges followed by gas chromatography-mass spectrometry (GC-MS). Recoveries and standard deviation of pesticides in non polluted real water sample spiked with a standard mixture were 82-119% and less then 20%. For PAH, recoveries and standard deviation were 56-78% and less then 18%, respectively, with exception to acenaphthylene, 23% and 2.7%. Atrazine was detected in the average concentration of 0.231 µg L -1 in two sites in Campos dos Goytacazes, near the sugar-cane power plants and plantations area, while no detection was observed in Resende. Irgarol was observed in Campos dos Goytacazes downtown at 0.138 µg L -1 , an area of small boating activities. Benzo [a]pyrene was detected at 0.255 µg L -1 in Resende, near the Presidente Dutra highway. PAHs were not detected in the water samples from Campos dos Goytacazes.

Ecophysiological adaptation and metal accumulation in water hyacinth from two tropical rivers

“…These activities may be altering the natural conditions of the river due to the insertion of greater quantities of some metals in this ecosystem (Malm et al, 1988). In middle PSR, Azevedo et al (2004) found polycyclic aromatic hydrocarbons, reinforcing the fact of rejects from industrial activities influencing this region of the river.…”

Triazines in the tropical lagoon system of Mundaú-Manguaba, NE-Brazil

“…The solvent was then removed at low temperature (< 35 ºC) by rotary evaporation. 20,21 Suspended particulate matter sample extraction…”

“…The solvent was then removed at low temperature (< 35 ºC) by rotary evaporation. 20,21 Suspended particulate matter sample extractionThe filters (four per site, totalling 1 L of filtered sample) were extracted by ultrasonification in 50 mL dichloromethane:methanol (DCM:MeOH; 8:2; v:v) for 20 min. The extraction procedure was repeated twice thereafter.…”

Tintas anti-incrustantes de terceira geração: novos biocidas no ambiente aquático

“…15,16 Entretanto, a maior parte destes estudos têm sido realizados em áreas portuárias e marinas da Europa, 17 Estados Unidos da América 18 e Japão, 19 existindo, até o momento, somente dois estudos do gênero para a América do Sul. 20,21 Sendo assim, em razão da crescente relevância do tema, o presente trabalho teve por objetivo compilar informações acerca das propriedades físico-químicas, comportamento e níveis ambientais, toxicidade, e metodologias analíticas desses 16 biocidas utilizados nas tintas anti-incrustantes de 3ª geração. Para tanto, os biocidas serão apresentados em dois grupos, conforme a presença ou não de metais na sua composição (biocidas não metálicos e metálicos).…”