Elution of aged and freshly added herbicides from a soil

Pignatello, Joseph J.; Ferrandino, Francis J.; Huang, Lee Q.

doi:10.1021/es00045a010

Cited by 209 publications

(171 citation statements)

References 46 publications

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“…These models were parallel models with discrete sites that may have different affinities for HOCs and different sorption mechanisms. Another kind of model often used is the two-compartment model with two sites in series [18]. It is assumed that the two compartments differ only in kinetics and not in their affinity for the HOCs.…”

Section: Introductionmentioning

confidence: 99%

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

Wang

Chen

et al. 2012

Journal of Colloid and Interface Science

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a b s t r a c tThe aging effects of sorption-desorption of two polycyclic aromatic hydrocarbons (PAHs), that is, phenanthrene and chrysene on different natural organic matters (NOMs), that is, humic acid, fulvic acid, and humins of different sources were studied. Both organic carbon-normalized distribution coefficients (K oc ) and the reversible desorption fractions (f rd ) were evaluated. Results showed that aging effects were both sorbent and sorbate specific. With increasing aging duration, K oc s of phenanthrene on humins increased, whereas K oc s of chrysene did not change significantly. Significant f rd declinations over aging times were observed for all the NOMs, which demonstrated the effects of aging on availability of PAHs. Furthermore, the f rd was not only positively correlated with the atomic O/C ratio of NOMs, which represent the geological maturity of NOMs, but also varied with the property of sorbates. We conclude that aging effects of HOCs on NOMs should be a case-specific process and the desorption reversibility depends on the structure and characteristics of both NOMs and sorbates.

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Section: Introductionmentioning

confidence: 99%

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

Wang

Chen

et al. 2012

Journal of Colloid and Interface Science

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“…Since atrazine was found in bound forms nine years after its application (Capriel et al, 1985), it can be assumed that this chemical compound is not excluded from environmental interaction even after long-term aging under outdoor conditions. Pignatello et al (1993) suggested that changing environmental dry-wet cycles may cause pulse inputs from resistant herbicide pools to subsurface layers, which might become crucial under changing environmental conditions. Soil organic matter is a key factor in the retention of atrazine by soils and the formation of bound residues (Loiseau and Barriuso, 2002).…”

Section: Introductionmentioning

confidence: 99%

Persistence of 14C-labeled atrazine and its residues in a field lysimeter soil after 22years

Jablonowski

Köppchen

Hofmann³

et al. 2009

Environmental Pollution

103

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Twenty-two years after the last application of ring-14 C-labeled atrazine at customary rate (1.7 kg ha −1 ) on an agriculturally used outdoor lysimeter, atrazine is still detectable by means of accelerated solvent extraction and LC-MS/MS analysis. Extractions of the 0-10 cm soil layer yielded 60% of the residual 14 C-activity. The extracts contained atrazine (1.0 µg kg −1 ) and 2-hydroxy-atrazine (42.5 µg kg −1 ). Extractions of the material of the lowest layer 55-60 cm consisting of fine gravel yielded 93% of residual 14 C-activity, of which 3.4 µg kg −1 was detected as atrazine and 17.7 µg kg −1 was 2-hydroxy-atrazine. The detection of atrazine in the lowest layer was of almost four times higher mass than in the upper soil layer. These 1 findings highlight the fact that atrazine is unexpectedly persistent in soil.The overall persistence of atrazine in the environment might represent a potential risk for successive groundwater contamination by leaching even after 22 years of environmental exposure.Keywords: atrazine, persistence, leaching, extraction, LC-MS/MS, halflife, bound residues. Capsule:Atrazine and its metabolite 2-hydroxy-atrazine are still present in soil after long-term aging.

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“…Os valores de meia-vida de dessorção (1/α, Tabela 13) foram de magnitude superior ao período de agitação de equilíbrio no "batch", o que associado ao fator profundidade da coluna, também ajuda explicar, em parte, a menor dessorção observada no experimento de colunas. Adicionalmente, Pignatello et al (1993) mostraram que a simples presença de um fluxo de água nas colunas pode contribuir de forma negativa com o equilíbrio de dessorção, favorecendo a difusão física da molécula para o interior dos microagregados.…”

Section: Sorção E Dessorçãounclassified

“…Alguns modelos matemáticos, baseados na equação de convecção-dispersão (ECD), além de modelar as curvas de lixiviação para muitos casos (Ma & Selim, 1996), podem até mesmo prever a distribuição da fração remanescente do soluto, nas colunas, após o término da percolação (Pignatello et al, 1993). O transporte de solutos no solo é assumido ser afetado pelos processos de não-equilíbrio de sorção, decorrentes de fatores químicos e físicos (Nielsen et al,1986;Kookana et al, 1993;Vereecken et al, 2001).…”

Section: Introductionunclassified

Comportamento do glifosato no solo e deslocamento miscível de atrazina

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Elution of aged and freshly added herbicides from a soil

Cited by 209 publications

References 46 publications

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

Aging effects on sorption–desorption behaviors of PAHs in different natural organic matters

Persistence of 14C-labeled atrazine and its residues in a field lysimeter soil after 22years

Comportamento do glifosato no solo e deslocamento miscível de atrazina

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