Quantitative and enantioselective analyses of non-extractable residues of the fungicide metalaxyl in soil

Kalathoor, Roschni; Botterweck, Jens; Schäffer, Andreas; Schmidt, Burkhard; Schwarzbauer, Jan

doi:10.1007/s11368-014-1027-9

Cited by 18 publications

(7 citation statements)

References 36 publications

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“… 55 Non-humic substances mainly derive from animals, plants, microorganisms and their residues, in the forms of sugars, amino acids, proteins, lignin and organic acids. 56 Humic acids are the major extractable component of soil humic substances and are the primary organic compounds of soil. The molecular size of humic acids range from approximately 10 000 Da to 100 000 Da, about 35% of the humic acid molecules are aromatic, while the remaining components are in the form of aliphatic molecules.…”

Section: Sources and Structure Of Dom In Farmland Soilmentioning

confidence: 99%

Structural characteristics, analytical techniques and interactions with organic contaminants of dissolved organic matter derived from crop straw: a critical review

et al. 2018

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Section: Sources and Structure Of Dom In Farmland Soilmentioning

confidence: 99%

Structural characteristics, analytical techniques and interactions with organic contaminants of dissolved organic matter derived from crop straw: a critical review

et al. 2018

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“…As Li et al investigated, the lateral remobilized DDXs from soil contributed to 20–42% of the total DDXs fluxes.The risk of DDXs would be underestimated without considering NER-DDXs. Consequently, it is quite critical to understand the remobilization potential of NER-DDXs for risk assessments, as it is important for the bioavailability in aquatic and terrestrial systems and the (eco)toxic potential . Concentrations of DDA, its precursors as well as of DDCN in EF (defined as EF-risk) plus concentrations of DDA, its metabolites and DDCN in the nonextractable fractions (defined as NER-risk) were calculated as the quantified total DDXs remobilization risk according to Frische, Ricking,and Schwarzbauer. , Considering the extraordinarily high EF-DDT level in TC-S1, EF-risk at this location was quantified as the average value of TC-S2 and TC-S3.…”

Section: Results and Ddiscussionmentioning

confidence: 99%

Formation and Fate of Point-Source Nonextractable DDT-Related Compounds on Their Environmental Aquatic-Terrestrial Pathway

Zhu

Dsikowitzky

Kucher

et al. 2019

Environ. Sci. Technol.

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Nonextractable residues (NER) are pollutants incorporated into the matrix of natural solid matter via different binding mechanisms. They can become bioavailable or remobilize during physical−chemical changes of the surrounding conditions and should thus not be neglected in environmental risk assessment. Sediments, soils, and groundwater sludge contaminated with DDXs (DDT, dichlorodiphenyltrichloroethane; and its metabolites) were treated with solvent extraction, sequential chemical degradation, and thermochemolysis to study the fate of NER-DDX along different environmental aquatic-terrestrial pathways. The results showed that DDT and its first degradation products, DDD (dichlorodiphenyldichloroethane) and DDE (dichlorodiphenyldichloroethylene), were dominant in the free extractable fraction, whereas DDM (dichlorodiphenylmethane), DBP (dichlorobenzophenone), and DDA (dichlorodiphenylacetic acid) were observed primarily after chemical degradation. The detection of DDA, DDMUBr (bis(p-chlorophenyl)bromoethylene), DDPU (bis(p-chlorophenyl)-propene) and DDPS (bis(p-chlorophenyl)-propane) after chemical treatments evidenced the covalent bindings between these DDXs and the organic matrix. The identified NER-DDXs were categorized into three groups according to the three-step degradation process of DDT. Their distribution along the different pathways demonstrated significant specificity. Based on the obtained results, a conceptual model of the fate of NER-DDXs on their different environmental aquatic-terrestrial pathways is proposed. This model provides basic knowledge for risk assessment and remediation of both extractable and nonextractable DDT-related contaminations.

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“…Furthermore, given that autoclaving can reduce free radical-mediated degradation mechanisms (Skipper et al 1996) and HgCl2 triggers the formation of reactive oxygen species (Zhou et al 2009;Chen et al 2017), which are responsible of abiotic transformations of certain organic compounds such as SA (Skipper et al 1996), the progressive disappearance of SA in autoclaved soil and lack of dissipation in HgCl2-treated soil would support biodegradation rather than chemical oxidation as the major dissipation mechanism of SA in non-sterilized soil. On the other hand, bearing in mind that HgCl2 sterilization has been reported to be effective against microbial activity but not against extracellular enzyme activity ( Kalathoor et al 2015), extracellular enzymes pre-existing in soil do not appear to have played a dominant role in the dissipation of SA (Figure 2).…”

Section: Dissipation Of Sa In Soil Under Different Experimental Conditionsmentioning

confidence: 99%

Modulating the persistence and bioactivity of allelochemicals in the rhizosphere: salicylic acid, a case of study

Gámiz

Facenda

Celis

2018

Archives of Agronomy and Soil Science

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The activity of allelochemicals in agroecosystems are highly dependent on their soil persistence. The aim of this work was to establish a link between the soil persistence of salicylic acid (SA) and its bioactivity, to better understand the mechanisms of allelochemicalmediated soil-plant interactions. Incubation and bioassay experiments were conducted for this purpose. The addition of HgCl2 and decreasing temperature to 4 °C increased the persistence of SA in soil. Since these treatments greatly decreased the soil respiration, they probably slowed the SA dissipation by reducing the soil microbial activity. To a lesser extent, soil humidity and soil pH also influenced the SA dissipation rate. Exogenous olive-mill organic waste (ALP) increased the soil respiration, but interestingly, delayed the degradation of SA, presumably because ALP acted as an alternative source of C for soil microorganisms. The phytotoxicity of SA towards Eruca vesicaria in soil increased by the addition of ALP.Applied to soil at 0.5%, ALP reduced the SA dose for 50% Eruca vesicaria aerial biomass inhibition to 40%. Our results show how certain agronomic practices, such as the application of agri-industrial biosolids, could be used to modulate the persistence of allelochemicals in the rhizosphere and control their biological functions in soils.

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Quantitative and enantioselective analyses of non-extractable residues of the fungicide metalaxyl in soil

Cited by 18 publications

References 36 publications

Structural characteristics, analytical techniques and interactions with organic contaminants of dissolved organic matter derived from crop straw: a critical review

Structural characteristics, analytical techniques and interactions with organic contaminants of dissolved organic matter derived from crop straw: a critical review

Formation and Fate of Point-Source Nonextractable DDT-Related Compounds on Their Environmental Aquatic-Terrestrial Pathway

Modulating the persistence and bioactivity of allelochemicals in the rhizosphere: salicylic acid, a case of study

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