Degradation and leaching of the herbicides metolachlor and diuron: a case study in an area of Northern Italy

Caracciolo, Anna Barra; Giuliano, G.; Grenni, Paola; Guzzella, Licia; Pozzoni, F.; Bottoni, Paola; Fava, Luca; Crobe, Angela; Orrú, Maria Antonietta; Funari, Enzo

doi:10.1016/j.envpol.2004.08.014

Cited by 70 publications

(47 citation statements)

References 55 publications

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“…Dyson et al, 2002;Guo et al, 2000;Park et al, 2003), which, in turn, hampers degradationinduced fractionation before the first rainfall event of 21 May. Moreover, little degradation before June may be explained by lower soil temperature in spring (daily mean air temperatures mostly between 5 and 10 • C in April and around 10 • C on several days in May), resulting in lower microbial activity (Dinelli et al, 2000;Barra Caracciolo et al, 2005).…”

Section: Input Data and Calibrationmentioning

confidence: 99%

“…Overall, this study demonstrates the benefit of combining monitoring and conceptual modelling of concentration and CSIA data and advocates the use of traveltime distributions for assessing pesticide fate and transport on catchment scale. Goolsby, 1999) or the extent of dilution by pristine water (Schreglmann et al, 2013). Hence, concentration data alone cannot conclusively allow distinction between destructive (i.e.…”

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confidence: 99%

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Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Lutz

Velde

Elsayed

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Compound-specific stable isotope analysis (CSIA) has proven beneficial in the characterization of contaminant degradation in groundwater, but it has never been used to assess pesticide transformation on catchment scale. This study presents concentration and carbon CSIA data of the herbicides S-metolachlor and acetochlor from three locations (plot, drain, and catchment outlets) in a 47 ha agricultural catchment (Bas-Rhin, France). Herbicide concentrations at the catchment outlet were highest (62 µg L −1 ) in response to an intense rainfall event following herbicide application. Increasing δ 13 C values of S-metolachlor and acetochlor by more than 2 ‰ during the study period indicated herbicide degradation. To assist the interpretation of these data, discharge, concentrations, and δ 13 C values of S-metolachlor were modelled with a conceptual mathematical model using the transport formulation by travel-time distributions. Testing of different model setups supported the assumption that degradation half-lives (DT50) increase with increasing soil depth, which can be straightforwardly implemented in conceptual models using travel-time distributions. Moreover, model calibration yielded an estimate of a field-integrated isotopic enrichment factor as opposed to laboratory-based assessments of enrichment factors in closed systems. Thirdly, the Rayleigh equation commonly applied in groundwater studies was tested by our model for its potential to quantify degradation on catchment scale. It provided conservative estimates on the extent of degradation as occurred in stream samples. However, largely exceeding the simulated degradation within the entire catchment, these estimates were not representative of overall degradation on catchment scale. The conceptual modelling approach thus enabled us to upscale sample-based CSIA information on degradation to the catchment scale. Overall, this study demonstrates the benefit of combining monitoring and conceptual modelling of concentration and CSIA data and advocates the use of traveltime distributions for assessing pesticide fate and transport on catchment scale.

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Section: Input Data and Calibrationmentioning

confidence: 99%

mentioning

confidence: 99%

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Lutz

Velde

Elsayed

et al. 2017

Hydrol. Earth Syst. Sci.

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“…However, increasing interest in this topic in recent years, as well as the improvement in the methods of analysis, has produced more information about the quality of groundwater. In recent years several monitoring programmes have been applied in the USA [2][3][4][5][6][7] and in many European countries [8][9][10][11][12][13][14][15] to determine a large variety of pesticides and some transformation products (TPs) in groundwater. Although some data are available on pesticide residues in Spanish groundwater [16][17][18][19][20], there is a lack of monitoring programmes of sufficient scope to focus on the compounds that are most widely applied and, consequently, with the highest potential to contaminate groundwater.…”

Section: Introductionmentioning

confidence: 99%

Pesticide residues and transformation products in groundwater from a Spanish agricultural region on the Mediterranean Coast

Hernández

Marín

Pozo

et al. 2008

International Journal of Environmental Analytical Chemistry

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An overview is given on the presence and changes over time of pesticide residues in groundwater from the Valencia region, one of the most important citrus cultivation sites of southern Europe. A multiresidue LC-MS/MS method was applied for the screening of around 50 pesticides in 75 water samples collected during 2000. The herbicides simazine, terbuthylazine, bromacil, terbumeton, and diuron were the most frequently detected compounds. On the basis of compounds detected in these samples, another method that focused on 30 herbicides and relevant transformation products (TPs) was developed and applied to around 80 water samples collected during 2003. Simazine was the most frequently found compound followed by several triazine metabolites. Data for this paper show the vulnerability of groundwater in this area to herbicide applications and illustrate the importance of including pesticide TPs in environmental monitoring programmes, as four out of the five compounds most frequently detected were pesticide TPs.

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“…However, their further biodegradation, either by fungi or bacteria, has been reported in many studies Travkin et al, 2003). In soils, a wide range of microorganisms are present, and we can expect that the simultaneous action of various microorganisms will succeed in degrading these compounds (El-Fantroussi, 2000;Sorensen et al, 2003;Barra-Caracciolo et al, 2005 importance of a continuous search for new strains with degradative activity given the high degradation rates observed. They could be used efficiently in bioremediation of pesticide-polluted soils, since they easily survive and proliferate as a consequence of their mycelial growth and great potential metabolic diversity.…”

Section: Biodegradation Studiesmentioning

confidence: 99%

Biodegradation of the herbicide diuron by streptomycetes isolated from soil

Castillo

Felis

Aragón

et al. 2006

International Biodeterioration & Biodegradation

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The diuron degrading activity of 17 streptomycete strains, obtained from agricultural and non-agricultural soils, was determined in the laboratory. All strains were identified as Streptomyces sp. by phenotypic characteristics and PCR-based assays. The strains were cultivated in liquid medium with diuron (4 mg L -1 ) at 25 1C for 15 days. Biodegradation activity was determined by high-performance liquid chromatography. The results indicated that all strains were able to degrade diuron, but to different amounts. Twelve strains degraded the herbicide by up to 50% and four of them by up to 70%. Strain A7-9, belonging to S. albidofl cluster, was the most efficient organism in the degradation of diuron, achieving 95% degradation after five days of incubation and no herbicide remained after 10 days. Overall, the strains isolated from agricultural soils exhibited higher degradation percentages and rates than those isolated from non-agricultural soils. Given the high degradation activity observed here, the streptomycete strains show a good potential for bioremediation of soils contaminated with diuron.

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Degradation and leaching of the herbicides metolachlor and diuron: a case study in an area of Northern Italy

Cited by 70 publications

References 55 publications

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Pesticide residues and transformation products in groundwater from a Spanish agricultural region on the Mediterranean Coast

Biodegradation of the herbicide diuron by streptomycetes isolated from soil

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