Herbicides Persistence in Rice Paddy Water in Southern Brazil

Zanella, Renato; Adaime, Martha B.; Peixoto, Sandra Cadore; Friggi, Caroline do Amaral; Prestes, Osmar D.; Machado, Sérgio Luiz de Oliveira; Marchesan, Enio; Avila, Luis Antônio de; Prímel, Ednei Gilberto

doi:10.5772/32727

Cited by 12 publications

(10 citation statements)

References 88 publications

(74 reference statements)

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“…However, the degradation of imazapic by sunlight is believed to be minimal when it is applied to terrestrial plants or soil, but it is rapidly degraded by sunlight in aqueous solutions [16]. Imazapyr residues can be relatively persistent in soils (reported soil half-life (t50) = 25-142 days) depending on soil texture, organic matter content, pH levels and environmental factors that promote microbial degradation [10][11][12][13][14][15][16][17].…”

Section: Resultsmentioning

confidence: 99%

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Persistence of Imazapic and Imazapyr in Paddy Soil and Water

2016

IJAAEE

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Abstract-Studies on the persistence of imazapic and imazapyr in a Malaysian soil, namely clay loam and in water, were conducted under greenhouse conditions. The experiment was carried out in clay loam soil of the Sungai Besar paddy plantation area, in Selangor, Malaysia. An analytical method based on an extraction procedure and followed by high-performance liquid chromatographic (HPLC) separation with multi variable detection was optimized and validated for the simultaneous determination of imazapyr and imazapic. Chromatographic separation was carried out with the C8 column. The estimated values of the half-life of imazapyr in water for 75, 150 and 300 g ai/ha following first order kinetics were 22.00, 23.34 and 22.29 days, respectively. Meanwhile for imazapic, the estimated half-life in water for 75, 150 and 300 g ai/ha following first order kinetics were 23.11, 23.74 and 21.59 days, respectively. As for soil, the degradation rates of 26.26, 29.75 and 25.30 days were observed as the estimated half-life values for imazapyr and 38.51, 34.15 and 25.02 days for imazapic for the treatments of 75, 150 and 300 g ai/ha respectively. The rates of degradation of both active ingredients were slower in soil than in water. These results are informative to both farmers and researchers to enable them to keep track on the environmental effects of selected herbicides so that the probability of unwanted ecological effects can be minimized.

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Section: Resultsmentioning

confidence: 99%

“…[10] and Tu et al [11] Persistence refers to the soil's ability to hold any kind of pesticides and not allowing them to be transported [12]. In this case, a more stabil herbicides compounds require a longer time to be broken down [13]. The application of imazapic and imazapyr for controlling weedy rice in the Malaysian…”

Section: Introductionmentioning

confidence: 99%

Persistence of Imazapic and Imazapyr in Paddy Soil and Water

2016

IJAAEE

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“…Herbicidas do grupo das imidazolinonas, com amplo espectro de atuação no controle de plantas daninhas e alta persistência no solo e na água [30] , tais como imazapique e imazetapir, são empregados em larga escala na agricultura pela sua eficiência, mesmo em baixas doses de aplicação. Apesar de sua baixa toxicidade para mamíferos e outros animais, para muitos herbicidas desse grupo, uma concentração de 0,1 µg L -1 em água tem sido considerada como tóxica para plantas não alvo [31] .…”

Section: Introductionunclassified

“…No Brasil, o herbicida imazapique tem uso autorizado para as culturas arroz, cana--de-açúcar, amendoim e milho e o imazetapir, para arroz, feijão e soja. Imazapique e imazetapir são altamente solúveis em água, com 2.200 e 1.400 mg L -1 , respectivamente [30] . Os valores da constante de dissociação ácida (pKa) para imazapique são 2,0 e 3,6 e para imazetapir são 2,1 e 3,9, indicando que os dois são herbicidas ácidos [30] .…”

Section: Introductionunclassified

Determinação de resíduos de herbicidas em águas de lavoura de arroz irrigado empregando Extração em Fase Sólida e Cromatografia Líquida de Alta Eficiência com detecção por Arranjo de Diodos

Gonçalves¹,

Matos²,

Zanella³

2013

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Os herbicidas aplicados nas lavouras são, em geral, persistentes e podem poluir os mananciais hídricos. Portanto, o presente trabalho objetivou o desenvolvimento e a validação de um método para a determinação de resíduos dos herbicidas clomazona, imazapique e imazetapir em água de lavoura de arroz irrigado. O método envolve o preparo de amostra empregando Extração em Fase Sólida, para permitir um fator de concentração adequado, e a quantificação por Cromatografia Líquida de Alta Eficiência com detecção por Arranjo de Diodos. Após otimização dos parâmetros de extração e análise, o método foi validado avaliando-se curva analítica, linearidade, limites de detecção e de quantificação, precisão (repetitividade e precisão intermediária) e exatidão. Os resultados mostraram excelente linearidade para todos os compostos (r 2 > 0,99) na faixa entre o limite de quantificação e 2,5 mg L-1. O método apresentou recuperações entre 81% e 107%, com RSD < 9%, e foi aplicado na determinação de resíduos dos herbicidas em água de lavoura irrigada, com limites de quantificação (LOQ) de 0,12 µg L-1 para imazapique e imazetapir, e de 0,25 µg L-1 para clomazona.

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“…Agricultural activity is an important cause of reduced water quality through pollution by agrochemicals, and especially pesticides. Environmental water pollution by pesticides is an international concern with widespread ecological consequences (9). Some monitoring programs for surface waters have been conducted to quantify the degree of pollution by pesticides in rice paddy fields (10)(11)(12)(13)(14)(15)(16).…”

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Pesticide Multiresidue Determination in Rice Paddy Water by Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry

Pereira

Facco

Zemolin

et al. 2014

Journal of AOAC INTERNATIONAL

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Pollution of water sources by pesticides is a result of intensive use of these compounds, and the establishment of analytical methods for monitoring programs is very important. This paper presents a method for the determination of multiclass pesticide residues in rice paddy water based on SPE and GC/MS/MS. The validation results were satisfactory. All compounds showed adequate linearity (r2 >or= 0.99), and analysis by GC/MS/MS with a triple quadrupole mass spectrometer gave high selectivity and sensitivity. With the proposed SPE step an LOD of 0.06 microg/L was achieved. Recoveries from blank samples spiked at 0.2, 04, and 0.8 microg/L were between 70 and 120% with RSD <20% for most analyzed compounds, despite their different chemical nature, indicating good accuracy and precision. The proposed method is efficient for pesticide residue determination, including some metabolites, and gave good performance when applied to real samples.

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Herbicides Persistence in Rice Paddy Water in Southern Brazil

Cited by 12 publications

References 88 publications

Persistence of Imazapic and Imazapyr in Paddy Soil and Water

Persistence of Imazapic and Imazapyr in Paddy Soil and Water

Determinação de resíduos de herbicidas em águas de lavoura de arroz irrigado empregando Extração em Fase Sólida e Cromatografia Líquida de Alta Eficiência com detecção por Arranjo de Diodos

Pesticide Multiresidue Determination in Rice Paddy Water by Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry

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Herbicides Persistence in Rice Paddy Water in Southern Brazil

Cited by 12 publications

References 88 publications

Persistence of Imazapic and Imazapyr in Paddy Soil and Water

Persistence of Imazapic and Imazapyr in Paddy Soil and Water

Determinação de resíduos de herbicidas em águas de lavoura de ­arroz irrigado empregando Extração em Fase Sólida e ­Cromatografia Líquida de Alta Eficiência com detecção por Arranjo de Diodos

Pesticide Multiresidue Determination in Rice Paddy Water by Gas Chromatography Coupled with Triple Quadrupole Mass Spectrometry

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Determinação de resíduos de herbicidas em águas de lavoura de arroz irrigado empregando Extração em Fase Sólida e Cromatografia Líquida de Alta Eficiência com detecção por Arranjo de Diodos