Monitoring of the harmful concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D) in soils with and without organic matter

Prado, Alexandre G.S.; Vieira, Eny María; Rezende, Maria Olímpia de Oliveira

doi:10.1590/s0103-50532001000400007

Cited by 12 publications

(3 citation statements)

References 6 publications

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“…2,4-Dichlorophenoxiacetic acid (2,4-D) is a systemic herbicide widely spread in Brazilian agriculture. [1] Several data have been issued about the toxicity of the herbicide 2,4-D, its salts and esters, which are classified as harmful substances in countries such as the USA and New Zealand. [2][3][4] 2,4-D (CAS 94-75-7) is produced by condensation of MCA (monochloroacetic acid, CAS 79-11-8) and 2,4-DCP (2,4-dichlorophenol, CAS 120-83-2) in alkaline medium.…”

Section: Introductionmentioning

confidence: 99%

Photo-Fenton degradation of phenol, 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenol mixture in saline solution using a falling-film solar reactor

Nascimento

Foletto

Moraes

et al. 2013

Environmental Technology

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In this work, a saline aqueous solution of phenol, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-dichlorophenol (2,4-DCP) was treated by the photo-Fenton process in a falling-film solar reactor. The influence of the parameters such as initial pH (5-7), initial concentration of Fe2+ (1-2.5mM) and rate of H202 addition (1.87-3.74mmol min-1) was investigated. The efficiency of photodegradation was determined from the removal of dissolved organic carbon (DOC), described by the species degradation of phenol, 2,4-D and 2,4-DCP. Response surface methodology was employed to assess the effects of the variables investigated, i.e. [Fe2+], [H202] and pH, in the photo-Fenton process with solar irradiation. The results reveal that the variables' initial concentration of Fe2+ and H202 presents predominant effect on pollutants' degradation in terms of DOC removal, while pH showed no influence. Under the most adequate experimental conditions, about 85% DOC removal was obtained in 180 min by using a reaction system employed here, and total removal of phenol, 2,4- and 2,4-DCP mixture in about 30min.

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Section: Introductionmentioning

confidence: 99%

Photo-Fenton degradation of phenol, 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenol mixture in saline solution using a falling-film solar reactor

Nascimento

Foletto

Moraes

et al. 2013

Environmental Technology

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“…Consequently, the high amounts of herbicides applied to crops arise from commercial and technological interests. However, the excessive use of pesticides on crops is a matter of environmental concern, since these compounds are recognized as sources of potential adverse impacts [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

A toxicity view of the pesticide picloram when immobilized onto a silica gel surface

Prado

Airoldi

2003

Analytical and Bioanalytical Chemistry

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The pesticide picloram (4-amino-3,5,6-trichloropicolinic acid) was anchored onto silica gel to yield a new surface. Isothermal microcalorimetry was applied to study the toxic effects caused to microbial activity of a typical Brazilian agricultural soil by application of free and immobilized picloram. The activity of the microorganisms in 1.50 g of soil sample was stimulated by addition of 6.0 mg of glucose plus 6.0 mg of ammonium sulfate under 34.8% controlled humidity at 298.15+/-0.02 K. The activity was recorded through power-time curves for increasing amounts of the active principle, varying from zero to 10.00 microg g(-1). The increasing amounts of picloram, either free or immobilized, caused a decrease of the original thermal effect. The calorimetric data showed that the anchored pesticide presented a much lower toxic effect than the free picloram on the microbial activity.

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“…A cromatografia, com uso de distintos detectores e metodologias como as multirresiduais, vem sendo destacada como uma das ferramentas analíticas mais empregadas nesse tipo de estudo (11-16). Por conseguinte, estudos ambientais sobre impactos de pesticidas no Brasil têm sido apresentados na literatura (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30).…”

Section: Introductionunclassified

Análise De Pesticidas Em Amostras Ambientais Oriundas Da Barragem De Boa Esperança (Pi/Ma Brasil): Avaliação Preliminar

Marques¹,

Nunes²,

Queiroz³

et al. 2002

PES

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A Barragem de Boa Esperança constitui importante potencial hídrico, social e econômico para a região Nordeste do Brasil, necessitando de monitoramento constante. Amostras de água e sedimentos foram coletadas e os princípios ativos Monocrotofós, Pirimicarb, Carbendazim, Triclorfon e Fenvalerato analisados por cromatografia a gás. Utilizou-se metodologia multirresíduo para extração dos pesticidas (FDA modificado) e cromatografia a gás (CG DCE/DFC). A metodologia forneceu eficiência e linearidade, com recuperações entre 69 e 86% para amostras fortificadas. Fenvalerato e Triclorfon foram detectados em dois pontos de coleta de amostras. Não foram detectados nenhum dos pesticidas em amostras de sedimentos. ANALYSIS OF PESTICIDES IN ENVIRONMENTAL SAMPLES (WATER AND SEDIMENTS) OF THE BOA ESPERANÇA BARRAGE: BRAZIL - PI/MA: PRELIMINARY AVALIATION Abstract Boa Esperança barrage is a very important social and economical region for northeast of Brazil, and it needs continuous enviromental monitoring. Water and sediments samples were collected in order to determine the most commonly used pesticides Monocrotophos, Pirimicarb, Carbendazim, Trichlorfon and Fenvalerate. It was employed the modified FDA multiresidue extraction method, followed by gas chromatography analysis (GC FID/ FPD). This method provided good efficiency and adequate linearity, with recovery ranging from 69 to 86% for fortified samples. Fenvalerate and Trichlorfon were detected in two points of sampling. The selected pesticides have not been detected in sediments.

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Monitoring of the harmful concentrations of 2,4-dichlorophenoxyacetic acid (2,4-D) in soils with and without organic matter

Cited by 12 publications

References 6 publications

Photo-Fenton degradation of phenol, 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenol mixture in saline solution using a falling-film solar reactor

Photo-Fenton degradation of phenol, 2,4-dichlorophenoxyacetic acid and 2,4-dichlorophenol mixture in saline solution using a falling-film solar reactor

A toxicity view of the pesticide picloram when immobilized onto a silica gel surface

Análise De Pesticidas Em Amostras Ambientais Oriundas Da Barragem De Boa Esperança (Pi/Ma Brasil): Avaliação Preliminar

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