Liberação de resíduos não-extraíveis ou ligados do herbicida atrazina em solo e sua absorção por plantas

Nakagawa, Lia Emi; Andréa, Mara Mercedes de

doi:10.1590/s0100-204x2000000800003

Cited by 3 publications

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References 17 publications

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“…Isto implica que o procedimento de extração a ser utilizado não quantificará a presença da totalidade dos pesticidas a serem considerados, mas sim quantificará os pesticidas não ligados (Nakagawa, 2000). Estes dados, por sua vez podem ser utilizados para o cálculo da bioacessibilidade destes compostos, sendo a bioacessibilidade definida como a fração máxima de contaminantes presentes no solo que podem ser recuperados de um modelo de composição fisiológica e condições de digestão do trato digestivo humano (Kramer, 2000).…”

Section: Introductionunclassified

Estudo dos poluentes orgânicos persistentes (POPs) em regiões industriais da Grande São Paulo - via cromatografia a gás acoplada a espectrometria de massas (GC-MS) e captura de elétrons (GC-ECD)

Oliveira¹

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"A rapidez da mudança e a velocidade com que novas situações são criadas seguem o ritmo impetuoso e insensato da humanidade, e não o passo cauteloso da natureza." RACHEL CARSON i Estudo dos poluentes orgânicos persistentes (POPs) em regiões industriais da Grande São Paulo -via cromatografia a gás acoplada a espectrometria de massas (GC-MS) e captura de elétrons (GC-ECD)Justine Paula Ramos de Oliveira RESUMO O estudo objetivou desenvolver e validar um método para identificar e quantificar poluentes orgânicos persistentes, conhecidos como POPs, em solo de regiões industriais dos municípios de Caieiras e Franco da Rocha -SP, via cromatografia a gás acoplada a Espectrometria de Massas (GC-MS) e Detector por Captura de Elétrons (ECD). Em observância ao Tratado de Estocolmo, patrocinadopela Organização das Nações Unidas -ONU, que prevê o banimento de pelo menos doze dos POPs, e no qual o Brasil é um dos 113 países signatários, o trabalho visou colaborar positivamente com essa questão ambiental tão importante.Estes compostos são tóxicos e altamente estáveis no ambiente e em organismos vivos, dentre os quais, são abordados nesse trabalho o clordano cis/trans (C 10 H 6 Cl 8 ), o heptacloro (C 10 H 5 Cl 7 ), o heptacloro epóxido cis/trans (C 10 H 5 Cl 7 ) e os isômeros α-, β-, γ-e δ-BHC (C 6 Cl 6 ). Para garantir a confiabilidade das análises realizadas, foram realizados ensaios de Validação da metodologia, com base nas diretrizes do INMETRO. A técnica de extração utilizada foi o QuEChERS, obtendo resultados de recuperação na faixa de 70 a 120% para a maioria dos compostos estudados, considerados aceitáveis para matrizes complexas. Os limites de detecção e quantificação do método compreenderam a faixa de 0,0002 e 0,01 µg.g 1 , respectivamente. As amostras analisadas apresentaram contaminação pelos compostos hexaclorobenzeno α-, β-, γ-e δ-, muitas das quais estão acima dos limites máximos permissíveis, de acordo com as legislações nacionais e internacionais vigentes.ii Study of persistent organic pollutants (POPs) in industrial areas of Greater São Paulo -via gas chromatography-mass spectrometry (GC-MS) and electron capture (GC-ECD)Justine Paula Ramos de Oliveira ABSTRACTThe study aimed to develop and validate a method to identify and quantify persistent organic pollutants, known as POPs in soil of industrial regions Caieiras and Franco da Rocha municipalities in São Paulo, via gas chromatography coupled with Mass Spectrometry (GC-MS) and Electron Capture Detector (ECD). In compliance with the Treaty of Stockholm, sponsored by the United Nations -UN, which provides for a ban of at least twelve POPs, in which Brazil is one of the 113 signatory countries, the work aims to contribute positively to the environmental issue as important . These compounds are highly toxic and stable in the environment and living organisms, among which are address in this work chlordane cis / trans (C 10 H 6 Cl 8 ), heptachlor (C 10 H 5 Cl 7 ), heptachlor epoxide the cis / trans (C 10 H 5 Cl 7 ) and the isomers α -, β-, γ-and δ-BHC (C 6 Cl 6 ). To...

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Section: Introductionunclassified

Estudo dos poluentes orgânicos persistentes (POPs) em regiões industriais da Grande São Paulo - via cromatografia a gás acoplada a espectrometria de massas (GC-MS) e captura de elétrons (GC-ECD)

Oliveira¹

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Distribution of the herbicide atrazine in a microcosm with riparian forest plants

Bicalho

Langenbach

2012

Journal of Environmental Science and Health, Part B

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Pesticides applied on sugarcane reach the subsoil of riparian forests and probably contaminate the river water. This work was conducted to learn about the phytoremediation of atrazine and subsoil contamination using the common riparian forest species of Cecropia hololeuca Miq. and Trema micranta (L.) Blum. These plants were grown in soil microcosms where (14)C-atrazine at 1/10 of the field-recommended dose was applied at the bottom of the microcosm simulating the movement from contaminated ground water to the upper soil layers and into plants. Residues of (14)C-atrazine were detected in all parts of the microcosm including soil, rhizosphere and the roots in different layers of the microcosm, stem and leaves. Atrazine mineralization was higher (10.2%) in the microcosms with plants than the control microcosms without plants (1.2%). The upward movement of this pesticide from deeper to more superficial soil layers occurred in all the microcosms with plants, powered by evapotranspiration process. From the atrazine applied in this study about 45% was taken up by C. hololeuca and 35% by T. micrantha. The highest amount of radioactivity (%) was found in the fine roots and the specific radioactivity (% g(-1)) showed that thick, fine roots and leaves bioaccumulate atrazine. The enhanced mineralization of atrazine as well the phytostabilization effect of the tree biomass will reduce the bioavailability of these residues and consequently decrease the hazardous effects on the environment.

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Characterization of carbofuran bound residues and the effect of ageing on their distribution and bioavailability in the soil of a sugar beet field in north-western Morocco

Mohamed

Mrabet

Azmani

2016

European Journal of Environmental Sciences

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This study was undertaken to investigate distribution, fractionation, bioavailability and remobilization characteristics of bound soil-aged carbofuran and the effect of ageing in clay soil in a typical field of sugar beet at Loukkos in northwest Morocco. Results indicate that initially there were high levels of bound residues (BR) in the humin fraction, which decreased with incubation time and ageing of the BR. While in the fulvic and humic acid fractions, the amount of BR increased with the ageing of the BR and occurred predominantly (60%) in the fulvic acid fraction. The possibility of the mineralization and release of BR with ageing was studied using fresh soil and an incubation period of 90 days. The results indicate that the ageing of the residues have a great influence on the remobilization and mineralization rates of carbofuran BR; 9.45 to 14.90% of the total BR was released as extractable residues, and 1.95 to 4.15% was mineralized depending on the age of the residues in soil and the soil-aged carbofuran BR. The incorporation of the residues in the humin fraction is considered to be a threat to the environment. On the other hand, the clear prevalence of residues in the fulvic and humic acid fractions, may have an important effect on their bioavailability and movement in soil. Moreover, the re-extractability of BR could pose a potential environmental risk. Consequently, the BR remobilized must be taken into account when assessing for registration processes the environmental risk of pesticides persisting in soils.

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Liberação de resíduos não-extraíveis ou ligados do herbicida atrazina em solo e sua absorção por plantas

Cited by 3 publications

References 17 publications

Estudo dos poluentes orgânicos persistentes (POPs) em regiões industriais da Grande São Paulo - via cromatografia a gás acoplada a espectrometria de massas (GC-MS) e captura de elétrons (GC-ECD)

Estudo dos poluentes orgânicos persistentes (POPs) em regiões industriais da Grande São Paulo - via cromatografia a gás acoplada a espectrometria de massas (GC-MS) e captura de elétrons (GC-ECD)

Distribution of the herbicide atrazine in a microcosm with riparian forest plants

Characterization of carbofuran bound residues and the effect of ageing on their distribution and bioavailability in the soil of a sugar beet field in north-western Morocco

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