Abiotic Processes Influencing Fipronil and Desthiofipronil Dissipation in California, Usa, Rice Fields

Ngim, Kenley K.; Crosby, Donald G.

doi:10.1897/1551-5028(2001)020<0972:apifad>2.0.co;2

Cited by 27 publications

(44 citation statements)

References 17 publications

(31 reference statements)

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“…Volatilization of fipronil was confirmed to be slow (Table 1) 10) ; the Henry's law constant was experimentally determined to be 6.60ϫ10 Ϫ6 m 3 atm/mol. Also, the degradation product fipronil-desulfinyl was found to be virtually nonvolatile from water.…”

Section: Airmentioning

confidence: 94%

“…Also, the degradation product fipronil-desulfinyl was found to be virtually nonvolatile from water. 10) These findings suggest that fipronil does not readily dissipate via volatilization and thus will not be regularly found in air. However, aerosol drift during its spray application may still occur.…”

Section: Airmentioning

confidence: 98%

“…Fipronil-amide (hydrolysis) and fipronil-sulfone (oxidation) degradation products were also found but at low concentrations. 10) The microbial degradation of fipronil-desulfinyl (major soil photoproduct) has also been studied. 18) Calculated t 1/2 s were 630-693 days depending on the soil.…”

Section: Biotic Processesmentioning

confidence: 99%

“…Ngim and Crosby 10) found fipronil to be very toxic to resident crayfish of rice fields at ppb levels (14.3-19.5 mg/L; Table 5). Further, its degradation products have been found to have similar or greater toxicity-the 96-hr LC 50 s for fipronilsulfone, fipronil-sulfide, and fipronil-desulfinyl were 11.2, 15.5, and 68.6 mg/L, respectively.…”

Section: Aquatic Organismsmentioning

confidence: 99%

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Environmental fate and toxicology of fipronil

Gunasekara¹,

Truong²,

et al. 2007

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Section: Airmentioning

confidence: 94%

Section: Airmentioning

confidence: 98%

Section: Biotic Processesmentioning

confidence: 99%

Section: Aquatic Organismsmentioning

confidence: 99%

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Environmental fate and toxicology of fipronil

Gunasekara¹,

Truong²,

et al. 2007

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“…A volatilização do fipronil no ar é lenta, e foi confirmada por NGIM et al [20] Mesmo que utilizado de forma adequada, o fipronil pode contaminar o meio ambiente e gerar produtos de degradação mais tóxico. Torna-se importante o desenvolvimento de procedimentos analíticos para a sua determinação.…”

Section: 231-comportamento Do Fipronil No Meio Ambienteunclassified

Investigação do comportamento eletroquímico do inseticida fipronil e desenvolvimento de metodologia eletroanalítica

Amaral¹

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A todos os amigos e colegas que fiz no Grupo de Materiais Eletroquímicos e Métodos Eletroanalíticos (GMEME) pelas horas de conversa e descontração.A Sílvia e Andréia da secretaria da pós-graduação pelo bom atendimento.Às funcionárias da biblioteca pela pronta ajuda sempre que necessário. , respectivamente. O estudo por eletrólise a potencial controlado revelou que a oxidação do inseticida fipronil envolve a participação de um elétron. A metodologia desenvolvida para ambos os eletrodos foi aplicada em amostras de águas naturais, testes de recuperação foram realizados mostrando eficiência de recuperação 96,0% para o eletrodo de GPU e de 94,6% para o eletrodo de GC-MWCNTs. ABSTRACTIn this thesis a study of the electrochemical oxidation of the insecticide fipronil and the development of analytical methodologies for the determination of this compound in natural water samples is presented. The experiments were performed at graphitepolyurethane composite electrodes (GPU) and a glassy carbon electrode modified with multi-walled carbon nanotubes (MWCNTs-GC). The electrodes were caracterized using square wave voltammetry (SWV). Cyclic voltammetry (CV) was used to diagnose the degree of reversibility of the oxidation reaction of the insecticide as well as the nature of the transport of the electroactive material to the surface of the electrodes. The electrochemical oxidation of fipronil studies using the GPU electrode showed that fipronil oxidation presents a peak at 0.70 V (vs. E Ag/AgCl ) which is totally irreversible and controlled by adsorption of species on the electrode surface. , respectively. The study by controlled potential electrolysis showed that oxidation of the insecticide fipronil involves the participation of one electron. The methodology developed for both electrodes was applied to natural water samples, recovery tests were performed showing recovery efficiency of 96.0% for the GPU electrode and 94.6% for MWCNTs-GC electrode. LISTA DE FIGURASFigura LISTA DE ABREVIATURAS OU SIGLAS INTRODUÇÃONeste capítulo são apresentados os empregos de pesticidas no combate de pragas e insetos na agricultura, as características físico-químicas e toxicológicas do inseticida fipronil, como também os aspectos históricos e alguns trabalhos publicados na determinação analítica deste pesticida, demonstrando a importância no desenvolvimento de novas metodologias precisas e sensíveis para a análise de pesticidas em diferentes meios.Também são demonstrados um breve levantamento bibliográfico das características, construção e aplicação dos eletrodos de compósito grafitepoliuretana (GPU) e carbono vítreo modificado com nanotubos de carbono de paredes múltiplas (GC-MWCNTs) em eletroanalítica, mostrando a importância deste trabalho. Considerações GeraisOs pesticidas, também conhecidos por nomes como agrotóxicos e defensivos agrícolas, são todas substâncias ou misturas de substâncias que tem como objetivo prevenir, destruir ou combater qualquer tipo de praga presente em cultivo agrícola. ) aplicadas para controle de gafanhotos tev...

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Icon® rice seed treatment toxicity to crayfish (Procambarus clarkii) in experimental rice paddies

Biever

Hoberg

Jacobson

et al. 2003

Enviro Toxic and Chemistry

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Outdoor pools (2.3 x 2.3 m) were used to simulate typical rice agricultural practices in Louisiana, USA, to evaluate the toxicity of ICON (active ingredient [a.i.] fipronil) and its degradates to crayfish (Procambarus clarkii). Six paddies were planted with seed treated with ICON 6.2 FS at an exaggerated application rate of 0.05 kg a.i./ha (recommended rate, 0.042 kg a.i./ha), simulating three rice-planting scenarios. Two reference paddies were planted with untreated seed. Crayfish were exposed to tail water within 24 to 48 h after seeding, simulating standard Louisiana agricultural and water management practices. At 50 d after planting, a separate group of crayfish was caged in situ for 14 d to evaluate toxicity. An additional 50 crayfish were added to two paddies approximately 100 d after rice planting and held for 29 weeks to evaluate bioaccumulation. Residues of fipronil and its degradates in water and soil were similar to residue concentrations measured from rice fields in Louisiana. Tail water from the treated paddies was not toxic to crayfish. The fipronil 96-h median lethal concentration (LC50) for adult crayfish was 180 microg/L, which would provide at least a sixfold safety factor between the maximum fipronil concentration in tail water and the crayfish LC50. In situ exposures of crayfish also were not toxic. Concentrations of fipronil and its degradates after 29 weeks of exposure were less than 5 microg/kg in crayfish tail muscle tissue. These results demonstrate that label instructions adequately protect crayfish in a rice-crayfish cropping scenario when ICON is applied at maximum application rates as a seed treatment.

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Abiotic Processes Influencing Fipronil and Desthiofipronil Dissipation in California, Usa, Rice Fields

Cited by 27 publications

References 17 publications

Environmental fate and toxicology of fipronil

Environmental fate and toxicology of fipronil

Investigação do comportamento eletroquímico do inseticida fipronil e desenvolvimento de metodologia eletroanalítica

Icon® rice seed treatment toxicity to crayfish (Procambarus clarkii) in experimental rice paddies

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