Behavior of Pesticides in Water—Sediment Systems

Katagi, Toshiyuki

doi:10.1007/978-1-4612-1280-5_4

Cited by 17 publications

(19 citation statements)

References 222 publications

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“…The sedimentwater partition coefficient (K d ) is the measure of the distribution of a contaminant between sediment and water (Katagi, 2006). As the organic matter content of sediment is an important control on sorptive properties, the sediment-water partition coefficient is often normalized to K oc (K oc D K d /f oc where f oc is the fraction of organic carbon in the sediment) to describe the extent of sorption.…”

Section: Quantification Of Herbicide Sorption To Bed Sedimentsmentioning

confidence: 99%

Sediment storage in the shallow hyporheic of lowland vegetated river reaches

Heppell

Wharton

Cotton

et al. 2009

Hydrological Processes

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Abstract:Excessive fine sediment deposition on the river channel bed together with colmation of finer sediments within the hyporheic are now linked to the degradation of the aquatic habitats of gravel bed rivers in permeable catchments. Previous studies of chalk rivers (associated with outcrops of calcareous rock) have demonstrated the important role of aquatic vegetation in trapping fine sediment on the river channel bed. This research investigated the spatio-temporal patterns and composition of fine sediment stored in two vegetated river reaches, in the Frome and Piddle catchments, Dorset (UK), with contrasting hydrological regimes, in order to establish the importance of aquatic vegetation in controlling the magnitude and timing of sediment storage in chalk rivers.Monthly mapping of macrophyte and sediment cover at the two sites (Maiden Newton and Snatford Bridge, 2003-2004) revealed a cyclical pattern of sediment storage related to the growth and die-back of aquatic vegetation peaking at 66Ð8 kg m 2 in July 2003 at Maiden Newton, and 23Ð5 kg m 2 in October 2003 at Snatford Bridge. Sediment was stored within gravels and beneath vegetation in the margins and mid-channel locations at both sites. Significantly more sediment was stored beneath vegetation than within gravels. The spatio-temporal pattern of sediment storage at the reach scale and the composition of the stored sediments reflected the growth patterns and functional form (flexibility) of the dominant macrophytes Ranunculus penicillatus subsp. pseudofluitans (water crowfoot) and Rorippa nasturtium aquaticum (watercress). Finally, the paper discusses the implications of reach-scale patterns in sediment storage for contaminant storage.

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Section: Quantification Of Herbicide Sorption To Bed Sedimentsmentioning

confidence: 99%

Sediment storage in the shallow hyporheic of lowland vegetated river reaches

Heppell

Wharton

Cotton

et al. 2009

Hydrological Processes

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“…The total radioactivity did not decrease, and after 210 days, about 50% was still extractable with harsh extracting agents and conditions and 50% was nonextractable residues (16). Such an observable dissipation of the parent compound is often called "degradation" in studies of the fate of environmental pollutants (17). Mineralization to carbon dioxide seems to play only a minor role, with less than 2% 14 CO 2 evolving from 14 C-labeled SDZ in microcosms in bovine manure, soil, and soil manure slurries (12,18).…”

mentioning

confidence: 99%

Degradation of Sulfadiazine by Microbacterium lacus Strain SDZm4, Isolated from Lysimeters Previously Manured with Slurry from Sulfadiazine-Medicated Pigs

Tappe

Herbst

Hofmann

et al. 2013

Appl Environ Microbiol

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b Sulfadiazine (SDZ)-degrading bacterial cultures were enriched from the topsoil layer of lysimeters that were formerly treated with manure from pigs medicated with 14 C-labeled SDZ. The loss of about 35% of the applied radioactivity after an incubation period of 3 years was attributed to CO 2 release due to mineralization processes in the lysimeters. Microcosm experiments with moist soil and soil slurries originating from these lysimeters confirmed the presumed mineralization potential, and an SDZ-degrading bacterium was isolated. It was identified as Microbacterium lacus, denoted strain SDZm4. During degradation studies with M. lacus strain SDZm4 using pyrimidine-ring labeled SDZ, SDZ disappeared completely but no 14 CO 2 was released during 10 days of incubation. The entire applied radioactivity (AR) remained in solution and could be assigned to 2-aminopyrimidine. In contrast, for parallel incubations but with phenyl ring-labeled SDZ, 56% of the AR was released as 14 CO 2 , 16% was linked to biomass, and 21% remained as dissolved, not yet identified 14 C. Thus, it was shown that M. lacus extensively mineralized and partly assimilated the phenyl moiety of the SDZ molecule while forming equimolar amounts of 2-aminopyrimidine. This partial degradation might be an important step in the complete mineralization of SDZ by soil microorganisms.

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“…Jackson (2003) has investigated the field dissipation of boscalid in soil by using root zone model (PRZM-3) to validate a laboratory to field degradation conceptual model. Katagi (2006) has evaluated degradation of boscalid in pond and river. Another group (Chen et al 2007) has reported the degradation of boscalid in cucumbers.…”

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confidence: 99%

Dissipation and Residues of Boscalid in Strawberries and Soils

Chen

Zhang

2010

Bull Environ Contam Toxicol

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Field experiments were carried out to investigate the dissipation of boscalid in strawberries and soils and its residual levels in strawberries at two different sites. Boscalid (50% water dispersible granule) was applied at two dosages (349.5 and 525.0 g a.i./ha). Soils and strawberry samples were collected at 0, 1, 2, 3, 5, 7, 14, 21 days after application of boscalid. The results showed that boscalid dissipation pattern followed the first order kinetics with the half-lives of 4.9 and 6.4 days in strawberries and 6.1 and 8.0 days in the soils of Jinan and Beijing trail sites, respectively. The boscalid residues in strawberries were below the EU maximum residue level (5 mg/kg) after three days of application. This study suggests that boscalid is acceptable to apply for strawberries under the recommended dosage.

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Behavior of Pesticides in Water—Sediment Systems

Cited by 17 publications

References 222 publications

Sediment storage in the shallow hyporheic of lowland vegetated river reaches

Sediment storage in the shallow hyporheic of lowland vegetated river reaches

Degradation of Sulfadiazine by Microbacterium lacus Strain SDZm4, Isolated from Lysimeters Previously Manured with Slurry from Sulfadiazine-Medicated Pigs

Dissipation and Residues of Boscalid in Strawberries and Soils

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