Organochlorine pesticides in the sedimentary core of the southern Tibetan Plateau: The missing pieces induced by lateral remobilization

Li, Jun; Yuan, Guo‐Li; Duan, Xu-Chuan; Sun, Yong; Yu, Hong-Hui; Wang, Genhou

doi:10.1016/j.envpol.2017.10.078

Cited by 17 publications

(5 citation statements)

References 53 publications

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“…Because of the limited number of soil samples that was available for this study this has to be confirmed in future studies.The temporarily stored or sequestrated DDXs in the solid phase are possibly remobilized under appropriate conditions. 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 .…”

Section: Results and Ddiscussionmentioning

confidence: 99%

“…Because of the limited number of soil samples that was available for this study this has to be confirmed in future studies.The temporarily stored or sequestrated DDXs in the solid phase are possibly remobilized under appropriate conditions. As Li et al 55 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. 56 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.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

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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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Section: Results and Ddiscussionmentioning

confidence: 99%

“…Because of the limited number of soil samples that was available for this study this has to be confirmed in future studies.The temporarily stored or sequestrated DDXs in the solid phase are possibly remobilized under appropriate conditions. As Li et al 55 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. 56 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.…”

Section: Environmental Science and Technologymentioning

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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“…6 marked with a box). 107,171 These results indicate that various environmental compartments across the TP have been gravely threatened by POPs not only in sediments and soil, but also by those released by melting glaciers or the cryosphere under the inuence of global warming in the coming decades.…”

Section: Accumulation Of Hg and Pops In Lake Sedimentsmentioning

confidence: 95%

Impact of global warming on regional cycling of mercury and persistent organic pollutants on the Tibetan Plateau: current progress and future prospects

Chai

Zhou

Wang

2022

Environ. Sci.: Processes Impacts

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“…The sparrow decline was also directly related to the abuse of pesticides and herbicides though there is no official record of sparrow population decline. In order to improve crop yield, the use of pesticides in China has been developing towards high toxicity and high dose since the 1970s (Li et al, 2018). In addition to the use of highly toxic pesticides such as Organo-phosphate and parathion to kill insects, a variety of herbicides were also used to remove weeds in farmland.…”

Section: Effects Of Pesticides and Herbicidesmentioning

confidence: 99%

Possible conservation methods of sparrows in China

Li¹

2022

BCPSSH

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Tree and house sparrows are the most common sparrows in China, but sparrow populations have experienced extreme, man-made declines in history. Sparrows have been listed as beneficial birds in China, but the protective behavior of sparrows is almost invisible. This paper discusses the status of sparrows in China, compares the protection and coping methods of sparrows abroad, and provides possible protection schemes: (1) to provide adequate high-quality food sources in sparrow habitat; (2) to reduce the impact of habitat fragmentation; (3) to reduce unnecessary human intervention on sparrows; (4) to identify sparrow’s ecological functionality correctly. Future studies should incorporate more factors to comprehensively assess the need to protect sparrows.

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Organochlorine pesticides in the sedimentary core of the southern Tibetan Plateau: The missing pieces induced by lateral remobilization

Cited by 17 publications

References 53 publications

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

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

Impact of global warming on regional cycling of mercury and persistent organic pollutants on the Tibetan Plateau: current progress and future prospects

Possible conservation methods of sparrows in China

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