Theoretical and experimental relationships between soil adsorption, octanol-water partition coefficients, water solubilities, bioconcentration factors, and the parachor

Briggs, G. G.

doi:10.1021/jf00107a040

Cited by 546 publications

(267 citation statements)

References 22 publications

(29 reference statements)

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“…Desta forma, com o herbicida sorvido aos colóides e o crescimento da comunidade microbiana prejudicado, as condições para dissipação e redução da concentração do herbicida no solo não foram as ideais (BRIGGS, 1981;, o que explicaria a falta de desenvolvimento da planta-teste nas primeiras avaliações, o que ocorreu somente a partir de 150 herbicida que permanece muito tempo no solo, passível a concatenar processos de contaminação ambiental, quanto pelo agronômico, permitindo fazer inferências sobre a época em que se deve r e a l i z a r o p l a n t i o d e c u l t u r a s e m s u c e s s ã o , evitando-se assim o risco de fitotoxicidade para estas culturas, além dos aspectos relacionados à reaplicação do herbicida em cana soca. Neste caso, a provável presença do herbicida no solo, em nova a p l i c a ç ã o n a c a n a s o c a , p o d e r á a c a r r e t a r concentração do sulfentrazone no solo maior que a indicação agronômica, o que não é desejável.…”

Section: Resultsunclassified

Persistência do herbicida sulfentrazone em solo cultivado com cana-de-açúcar

2010

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RESUMOO objetivo do trabalho foi determinar o comportamento do herbicida sulfentrazone em solo francoargilo-arenoso cultivado com cana-de-açúcar. O delineamento experimental foi o de blocos ao acaso com cinco repetições e três tratamentos de sulfentrazone (0,0; 0,6 e 1,2 kg ha -1 ), aplicado como pré-emergente. Foram coletadas periodicamente amostras de solo (0-10 cm), em 23 épocas entre 0 e 704 dias após o tratamento (DAT). O comportamento do herbicida sulfentrazone foi avaliado por bioensaios usando a beterraba como planta-teste, sendo determinada que para a menor dose (0,6 kg ha -1 ), o herbicida persistiu até 601 DAT. Para a dose de 1,2 kg ha -1 , até o fim do ensaio aos 704 DAT, o herbicida ainda persistia. A persistência do herbicida sulfentrazone no solo é longa e proporcional à dose aplicada. Palavras-chave: resíduo, bioensaios, persistência, Saccharum sp ABSTRACT PERSISTENCE OF THE HERBICIDA SULFENTRAZONE IN SOIL CULTIVATED WITH SUGARCANEThe objective here was to determine the behavior of sulfentrazone in sandy clay soil cultivated with sugar cane. The experimental design was randomized blocks with five replications and three treatments of sulfentrazone (0.0, 0.6 and 1.2 kg ha -1 ), applied as pre-emergent. Samples of soil (0-10 cm), were regularly collected at 23 times between 0 and 704 days after treatment (DAT). The behavior of sulfentrazone was evaluated by bioassays using sugar beet as test plant, and analysis indicated that for the lower dose (0.6 kg ha -1 ), the herbicide persisted until 601 DAT. At the end of the test, 704 DAT, the herbicide still persisted for the dose of 1.2 kg ha -1 . The persistence of sulfentrazone in soil is long and proportional to applied dose.

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Section: Resultsunclassified

Persistência do herbicida sulfentrazone em solo cultivado com cana-de-açúcar

2010

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“…The results presented 06p6 in this part concern three selected molecules of pesticides with varying degrees of solubility. Solubility (S w in mg·L −1 ) and different K ow (octanol-water partitioning coefficient) values are used as indicators for estimating bioaccumulation in animals and plants and in predicting the toxic effects of substances (Veith et al, 1979;Briggs, 1981;Calamari and Vighi, 1990).…”

Section: > Concentration-discharge Relationships: Hysteresis Patternsmentioning

confidence: 99%

The role of storm flows in concentration of pesticides associated with particulate and dissolved fractions as a threat to aquatic ecosystems - Case study: the agricultural watershed of Save river (Southwest of France)

Taghavi

Merlina

Probst

2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words: pesticide, TSM, DOC, hysteresis patterns, flood flowMeasurement of the fluxes of pesticides was carried out for a year, ending in March 2009, in the Save catchment, in the vicinity of Toulouse. The hydrograph separation technique was used to evaluate the respective contribution of stormflow and baseflow in transport of 12 pesticide molecules. Transport of over 59% of pesticides and their controlling factors such as total suspended matter (TSM), particulate organic carbon (POC) and dissolved organic carbon (DOC) occurred during storm periods. Hysteresis patterns could be observed in the concentration-discharge relationships only for some molecules between rising and falling periods of the storm hydrograph. Clockwise hysteresis was noticed for low to moderately soluble pesticide molecules and for particulate fractions, which explains the role of surface runoff in pesticide displacement. In contrast, anticlockwise hysteresis was registered for soluble molecules and dissolved fractions, explaining the role of subsurface flows and soil leaching processes. The important role of TSM, POC and DOC in pesticide transport was clearly established. We also came to the conclusion that the role of stormy periods in pesticide movement and their controlling factors worked as a threat to aquatic ecosystems. And there was a positive relation between riverine TSM, POC, DOC and pesticides according to pesticide properties. RÉSUMÉLe rôle des crues sur la concentration en pesticides associés aux fractions particulaires et dissoutes, une menace pour les écosystèmes aquatiques Cas d'étude : le bassin versant agricole de la rivière Save (sud-ouest de la France) Mots-clés :pesticide, MES, COD, hystérésis, crue transportés durant les périodes de crue. Des hystérésis peuvent être observées sur les relations concentrations-débits, uniquement pour quelques molécules, entre la montée et la descente de crue. Des hystérésis dextres (sens des aiguilles d'une montre) sont observées pour les molécules peu ou modérément solubles et pour les fractions particulaires montrant le rôle du ruissellement de surface dans le transfert des pesticides. Au contraire, des hystérésis senestres (sens inverse) sont observées pour les molécules solubles et les fractions dissoutes montrant le rôle des écoulements hypodermiques et du lessivage des sols. On a pu établir clairement le rôle important des MES, du COP et du COD dans le transport des pesticides. Les résultats obtenus nous montrent aussi le rôle joué par les épisodes de crue sur les transferts de pesticides et de leurs facteurs de contrôle, représen-tant un risque potentiel important de contamination des eaux et une menace pour les écosystèmes aquatiques. Des relations positives sont mises en évidence entre les teneurs en MES, COD ou COP et les concentrations en pesticides selon les propriétés physico-chimiques des différents pesticides.

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“…The environmental fate of organic compounds is also correlated with the soil adsorption partition coefficient K OC . The modeling of these properties from structural parameters, with various QSPR models, has been investigated in many papers [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Environmental Properties for Chlorophenols with Posetic Quantitative Super-Structure/Property Relationships (QSSPR)

Ivanciuc

Klein

2006

IJMS

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Due to their widespread use in bactericides, insecticides, herbicides, and fungicides, chlorophenols represent an important source of soil contaminants. The environmental fate of these chemicals depends on their physico-chemical properties. In the absence of experimental values for these physico-chemical properties, one can use predicted values computed with quantitative structure-property relationships (QSPR). As an alternative to correlations to molecular structure we have studied the super-structure of a reaction network, thereby developing three new QSSPR models (poset-average, clusterexpansion, and splinoid poset) that can be applied to chemical compounds which can be hierarchically ordered into a reaction network. In the present work we illustrate these poset QSSPR models for the correlation of the octanol/water partition coefficient (log K ow ) and the soil sorption coefficient (log K OC ) of chlorophenols. Excellent results are obtained for all QSSPR poset models to yield: log K ow , r = 0.991, s = 0.107, with the cluster-expansion QSSPR; and log K OC , r = 0.938, s = 0.259, with the spline QSSPR. Thus, the poset QSSPR models predict environmentally important properties of chlorophenols.

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Theoretical and experimental relationships between soil adsorption, octanol-water partition coefficients, water solubilities, bioconcentration factors, and the parachor

Cited by 546 publications

References 22 publications

Persistência do herbicida sulfentrazone em solo cultivado com cana-de-açúcar

Persistência do herbicida sulfentrazone em solo cultivado com cana-de-açúcar

The role of storm flows in concentration of pesticides associated with particulate and dissolved fractions as a threat to aquatic ecosystems - Case study: the agricultural watershed of Save river (Southwest of France)

Prediction of Environmental Properties for Chlorophenols with Posetic Quantitative Super-Structure/Property Relationships (QSSPR)

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