Ametryne degradation by ionizing radiation
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2007
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INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th
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Resumo
Ametryne may be released to the environment during its manufacture, transport, storage, formulation and use as
selective herbicide for the control of annual broadleaf and grass weeds. It is applied as an aqueous suspension for preemergence or post-directed applications on crops. Depending on the pesticide formulation and type of application,
ametryne residues may be detectable in water, soil and on the surfaces for months or years. The herbicide used to this
study was Ametryne (commercial name, Gesapax 500), commonly used on field crops and on corn and commercialized
since 1975. Ametryne was analyzed by gas chromatography (GC Shimadzu 17A), after extraction with
hexane/dichloromethane (1:1 v/v) solution. The calibration curve was obtained with a regression coefficient of 0.9871.
In addition, the relative standard deviation was lower than 10%. The radiation-processing yield was evaluated by the
destruction G-value (Gd) (Eq. 1), that is defined by the number of destroyed molecules by absorption of 100 eV of
energy from ionizing radiation. Different concentrations of the herbicide (11.4 mol L
-1
; 22.7 mol L
-1
; 34.1 mol L
-1
and
45.5 mol L
-1
) were irradiated at the AECL “Gammacell 220”
60Co source, with 1 kGy, 3 kGy, 6 kGy, 9 kGy, 12kGy, 15
kGy and 30 kGy absorbed doses. After irradiation processing, the ametryne highest reduction rate occurs at low doses
of radiation: at 6 kGy more than 85-90% of all ametryne compounds were removed. Two products of incomplete
degradation of ametryne were identified as s-triazyne isomers. However, further work is needed in order to fully
understand the ametryne degradation mechanisms the degradation yield of ametryne depends on its initial
concentration and the process seems to be more efficient at higher concentrations.
Como referenciar
ANDRADE, DEBORA C. de; MELO, RITA P.; MORI, MANOEL N.; DUARTE, CELINA L. Ametryne degradation by ionizing radiation. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 8th/ MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 15th, Sept. 30 - Oct. 5, 2007, Santos, SP. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/18114. Acesso em: 19 Feb 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.