Occurrence and distribution of organochlorine pesticides and polycyclic aromatic hydrocarbons in surface sediments from Qinghai Lake, northeast Qinghai–Tibet plateau, China

Wu, Chenxi; Xiong, Xiong; Huang, Xiaolong; Xing, Xinli; Liu, Jiantong

doi:10.1016/j.jglr.2014.05.003

Cited by 15 publications

(4 citation statements)

References 54 publications

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“…These concentrations are extremely low and can be considered as background concentrations, as previously suggested by Guzzella et al (Guzzella et al, 2011). They are also comparable to concentrations measured in sediment samples collected from the Tibetan Plateau (Cheng et al, 2014;Wu et al, 2014). In addition, the mean percentage contribution of p,p'-DDE (56%) and p,p'-DDD (44%), with respect to the total DDx contamination, indicates that the parental compound p,p'-DDT was generally absent.…”

Section: Contaminant Concentration and The Distribution Pattern Of Thsupporting

confidence: 84%

POP and PAH contamination in the southern slopes of Mt. Everest (Himalaya, Nepal): Long-range atmospheric transport, glacier shrinkage, or local impact of tourism?

Guzzella

Salerno

Freppaz

et al. 2016

Science of The Total Environment

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Due to their physico-chemical properties, POPs and PAHs are subjected to long-range atmospheric transport (LRAT) and may be deposited in remote areas. In this study, the contamination with DDx, PCBs, PBDEs, and PAHs was investigated in sediments and soils collected on the southern slopes of Mt. Everest (Himalaya, Nepal) in two different sampling campaigns (2008 and 2012). The results showed a limited contamination with POPs and PAHs in both soil and sediment samples. Therefore, the southern slopes of Mt. Everest can be considered a remote area in almost pristine condition. The LRAT mechanism confirmed its primary role in the transfer of contaminants to remote regions, while the gradual melting of glaciers, due to global warming, and the subsequent release of contaminants was suggested to be a secondary source of pollution of the lake sediments. In addition, the increase of tourism in this area during the last decades might have influenced the present concentrations of PAHs in the sediments and soils.

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Section: Contaminant Concentration and The Distribution Pattern Of Thsupporting

confidence: 84%

POP and PAH contamination in the southern slopes of Mt. Everest (Himalaya, Nepal): Long-range atmospheric transport, glacier shrinkage, or local impact of tourism?

Guzzella

Salerno

Freppaz

et al. 2016

Science of The Total Environment

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“…β-HCH is more resistant to hydrolysis and biodegradation, and is the most stable isomer. A high ratio of β-HCH/(α-HCH + γ-HCH) indicates that HCHs are mainly historical pollution [ 29 ]. Otherwise, it indicates that HCHs originate from the recent use of pesticides or the dry and wet deposition of the atmosphere [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Distribution, Transfer, and Health Risk of Organochlorine Pesticides in Soil and Water of the Huangshui River Basin

Yu,

Zhou,

et al. 2023

Toxics

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The potential negative impacts of organochlorine pesticides on the environment and human health continue to receive attention. In order to study the spatial distribution characteristics of organochlorine pesticides in the inland alpine region, researchers collected soil and water samples in the Huangshui River Basin of the Qinghai–Tibetan Plateau and tested them for organochlorine pesticide residues represented by dichlorodiphenyltrichloroethane (DDT) and hexachlorohexane (HCH). The study identified the sources of OCPs by component analysis. We also constructed the LEVEL III model, applicable to the Huangshui River Basin, and used it to study the migration patterns of OCPs in various environmental media. OCPs were detected at low levels in the study area environment. The results of the OCPs source analysis show that there are both historical residuals and new sources in the region. Residual DDTs may originate from the mixture of technical DDTs and dicofol, and HCHs may originate from lindane or technical HCH. DDTs are mainly stored in soil, the input and output pathways are mainly atmospheric advection input and output, and its transport behavior in the environment is mainly air–soil exchange. Carcinogens in the study area pose little threat to people exposed to contaminated soil and contaminated water, but the cancer risk to children is greater than to adults. This study is helpful to managers of regional pesticide management and control.

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“…The most abundant compounds were HCH, heptachlor, aldrin, endrin, DDE, and endosulfan I and II, whereas PCB congeners was dominated by light chlorinated biphenyls. The isomeric ratios speci ed new inputs of lindane, endrin, heptachlor and technical endosulfan, while the ratios of DDTs isomers indicated earlier usage of this pollutant: DDT Wu et al (2014). analysed sediment from Qinghai Lake (northeast Qinghai-Tibet plateau).…”

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confidence: 99%

Organochlorine Pesticides and Polychlorinated Biphenyls in High Mountain Lakes, Mexico

García-Solorio

Muro

Rosa

et al. 2021

Preprint

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Pollution levels of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were investigated in the El Sol and the La Luna alpine lakes. The lakes are located in central Mexico, in the crater of the Nevado de Toluca volcano. The El Sol and the La Luna lakes are extremely relevant in Mexico and in the world because they are recognized as pristine regions and environmental reservoirs. Samples of atmospheric aerosol, sediment, plankton, and Tubifex tubifex were collected at three different sample locations for three years (2017, 2018, and 2019) at three different times of year, meaning that the weather conditions at the time of sampling were different. Pollutants were analysed by gas chromatography–mass spectrometry with negative chemical ionisation (GC-MS/NCI). Endosulfan was the most frequent and abundant pollutant, showing the highest peaks of all. Atmospheric aerosol revealed Σ2 = 45 pg/m3, including α and β, while sediment lakes displayed α, β and endosulfan sulphate as Σ3 = 1963 pg/g, whereas plankton and Tubifex tubifex showed Σ2 = 576 pg/g and 540 pg/g for α and β respectively. Results of endosulfan ratios (α/β) and (α-β/endosulfan sulphate) suggest that both fresh and old discharges continue to arrive at the lakesThis study shows for the first time the pollution levels of OCP and PCB in high mountain lakes in Mexico. These results that must be considered by policy makers to mitigate their use in the various productive activities of the region.

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Occurrence and distribution of organochlorine pesticides and polycyclic aromatic hydrocarbons in surface sediments from Qinghai Lake, northeast Qinghai–Tibet plateau, China

Cited by 15 publications

References 54 publications

POP and PAH contamination in the southern slopes of Mt. Everest (Himalaya, Nepal): Long-range atmospheric transport, glacier shrinkage, or local impact of tourism?

POP and PAH contamination in the southern slopes of Mt. Everest (Himalaya, Nepal): Long-range atmospheric transport, glacier shrinkage, or local impact of tourism?

Distribution, Transfer, and Health Risk of Organochlorine Pesticides in Soil and Water of the Huangshui River Basin

Organochlorine Pesticides and Polychlorinated Biphenyls in High Mountain Lakes, Mexico

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