Biodegradation: Selection of Suitable Model

Cetkauskaite, Anolda; Grigonis, U.; Berzinskiene, J.

doi:10.1006/eesa.1998.1637

Cited by 10 publications

(6 citation statements)

References 13 publications

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“…98) The different amide reactivity by conjugation with the bulky alkenyl moiety might cause insignificant biodegradation of flumorph (19). 99) Alkylation of the anilide nitrogen greatly reduced the bacterial availability, as reported for propachlor (33), 51,85) alachlor (34) 85) and metolachlor (36). 100) However, white rot fungus transformed (36) via demethylation, hydroxylation and hydrolytic dechlorination.…”

Section: Carboxylic Acids and Estersmentioning

confidence: 96%

“…38,50,51) When an acclimation or lag period (T a ≥0) is observed before the initiation of apparent biodegradation, kinetic analysis using "t−T a " as a time scale should be conducted. The simplest expression on the biodegradation of a substrate (S) is the pseudo-first-order reaction kinetics below, under the constant concentration of biomass (B).…”

Section: Kinetic Analysismentioning

confidence: 99%

“…When the biomass of non-degraders only increases with keeping k 1 almost constant, the calculated k b value decreases with the microbial growth. 51,55) Most of the biodegradation data were analyzed using Eq. 1, but many other kinetic models have been applied to explain deviations from the first-order kinetics.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…50,51) When a small number of active degraders grow on a substrate at [S]≪K s , the logistic kinetics is applied. Under the condition of [S]≫K s , zero-order or logarithmic kinetics explains the biodegradation when the substrate uptake by microbes is saturated and will be saturated, respectively.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…2.3 Amides, anilides, and ureas Propanil (16) was quickly degraded to form 3,4-dichloroaniline in various surface waters after a lag period of 3-7 days, 51,97) possibly by the action of microbial arylacylamidases. 4) In contrast, either lack of microbes having relevant enzymes or steric hindrance posed by a bulky cyclohexyl moiety resulted in insignificant degradation of fenhexamid (18).…”

Section: Carboxylic Acids and Estersmentioning

confidence: 99%

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Aerobic microbial transformation of pesticides in surface water

Katagi

2013

J. Pestic. Sci.

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Aerobic transformation by microbial organisms is a dissipation process of pesticides in surface water, but the corresponding information is much less available as compared with their microbial degradation in soil. Bacteria freely floating in water or associated with suspended particles are the key microorganisms degrading pesticides; their species and populations, however, depend on sites and seasons. The various factors related to pesticide properties, experimental conditions and characteristics of surface water are involved in the complex control of microbial processes. Bottom sediment and macrophytes with associated biofilms not only act as sink for pesticides but also provide the habitat for both bacteria and fungi that degrade pesticides. More understanding of each factor is necessary to utilize laboratory biodegradation data for the refined assessment of pesticide behavior in surface water.

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Section: Carboxylic Acids and Estersmentioning

confidence: 96%

Section: Kinetic Analysismentioning

confidence: 99%

Section: Kinetic Analysismentioning

confidence: 99%

Section: Kinetic Analysismentioning

confidence: 99%

Section: Carboxylic Acids and Estersmentioning

confidence: 99%

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Aerobic microbial transformation of pesticides in surface water

Katagi

2013

J. Pestic. Sci.

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Organoclays for controlled release of the herbicide fenuron

Hermosı́n

Calderón

Aguer

et al. 2001

Pest Management Science

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Organoclays were assayed as matrices in which to associate herbicides, with the aim of decreasing product losses that could give rise to water contamination from agricultural activities. Fenuron was selected as model of a very mobile and highly water-soluble herbicide. Two different organoclays of high (A-HDT) and low (H-C18) reversible fenuron sorption were selected. Herbicide-organoclay complexes were prepared from the two organoclays and with two different fenuron contents (20 and 40 g AI kg-1) and two different mixing times, so as to form a series of weak and strong complexes. The release of fenuron from those complexes into water and water/soil suspensions gave values of T50 (time to release 50% of the fenuron content) ranging from 0.3 min to 2400 h. The total fenuron released in these closed systems ranged from 48 to 80% of the fenuron in the complex. The organoclay type (high or low sorptivity) had the greatest influence on fenuron release, followed by the strong or weak complex, suggesting that herbicide-organoclay interactions are the main factors controlling release. Soil column leaching experiments showed fenuron-organoclay complexes to be effective in reducing the peak herbicide concentration in the leachate to a half (6 microns) or a quarter (3 microns) of that obtained from the free technical compound (12 microns). Herbicide lost through leaching was reduced from 78% for the free technical fenuron to 50-30%, depending on the organoclay used as carrier and the strength of the complex. Bioassay with ryegrass showed that the weak fenuron/H-C18 complex (40 g AI kg-1) gave the same herbicidal activity as technical fenuron. The potential suitability of low-sorptive organoclays for conferring slow-release properties on the fenuron complex has been demonstrated.

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Isolation and Characterization of Diuron-degrading Bacteria from Lotic Surface Water

et al. 2007

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The bacterial community structure of a diuron-degrading enrichment culture from lotic surface water samples was analyzed and the diuron-degrading strains were selected using a series of techniques combining temporal temperature gradient gel electrophoresis (TTGE) of 16 S rDNA gene V1-V3 variable regions, isolation of strains on agar plates, colony hybridization methods, and biodegradation assays. The TTGE fingerprints revealed that diuron had a strong impact on bacterial community structure and highlighted both diuron-sensitive and diuron-adapted bacterial strains. Two bacterial strains, designated IB78 and IB93 and identified as belonging to Pseudomonas sp. and Stenotrophomonas sp., were isolated and shown to degrade diuron in pure resting cells in a first-order kinetic reaction during the first 24 h of incubation with no 3,4-DCA detected. The percentages of degradation varied from 25% to 60% for IB78 and 20% to 65% for IB93 and for a diuron concentration range from 20 mg/L to 2 mg/L, respectively. It is interesting to note that diuron was less degraded by single isolates than by mixed resting cells, thereby underlining a cumulative effect between these two strains. To the best of our knowledge, this is the first report of diuron-degrading strains isolated from lotic surface water.

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Biodegradation: Selection of Suitable Model

Cited by 10 publications

References 13 publications

Aerobic microbial transformation of pesticides in surface water

Aerobic microbial transformation of pesticides in surface water

Organoclays for controlled release of the herbicide fenuron

Isolation and Characterization of Diuron-degrading Bacteria from Lotic Surface Water

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