Distribution of Organochlorine Pesticides in a Sediment Profile of the Pearl River Estuary

Li, X. D.; X., B.; Zhang, Guoren; Sheng, Guoying; Fu, Jianjie; Pan, Shuguo; Wai, Onyx W. H.; Li, Y. S.

doi:10.1007/s001280203

Cited by 18 publications

(6 citation statements)

References 15 publications

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“…The ratio in this study varied from 0.22 -1.12, indicating more inputs of DDE and DDD to sediment from the wea-thered DDT, and there has not been much recent exposure to DDT in the environment [18]. Further, this reflects the aerobic conditions of the weathering process of DDTs in sediments in recent years [19].…”

Section: Ddd/ddementioning

confidence: 62%

Assessment of Organochlorine Pesticide Residues in the Surface Sediments of River Yamuna in Delhi, India

Pandey¹,

Khillare²,

Kumar³

2011

JEP

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The present study reports the concentration levels and distribution patterns of the organochlorine pesticide residues in the surface sediments of river Yamuna in the Indian capital state, Delhi. Analytical measurements were carried out for twenty organochlorine pesticides (OCPs) in the Pre-monsoon, Monsoon and Post-monsoon seasons, at six different sampling locations along the 22 km stretch of the river Yamuna in Delhi. The results revealed contamination of the surface sediments with several persistent organochlorine pesticides. Endrin aldehyde, Endosulfan sulfate and DDT showed the highest percentage composition of OCP at all the sampling sites in all the three seasons. The total organochlorine pesticides level ranged from 157.71 - 307.66 ng/g in Pre-monsoon to 195.86 - 577.74 ng/g in Monsoon and 306.9 - 844.45 ng/g in the Post-monsoon season. This not only demonstrates the pollution of the river with pesticide residues, but also the necessity of a continuous long-term monitoring of the affected environment

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Section: Ddd/ddementioning

confidence: 62%

Assessment of Organochlorine Pesticide Residues in the Surface Sediments of River Yamuna in Delhi, India

Pandey¹,

Khillare²,

Kumar³

2011

JEP

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“…In the Pearl River Delta (Figure ), the river network mainly comprises the Beijiang (North River), Zhujiang (main stream), Dongjiang (East River), and Xijiang (West River), and merges into the Pearl River estuary via eight outlets. The Pearl River estuary is one of the largest in the world, covering an area of 8000 km 2 ( , ). In the estuary, the waters from the northwestern inlets tend to flow along the west coast, owing to the circulation currents affected by the Coreolis force in the Northern Hemisphere and the prevailing westward wind in the region ().…”

Section: Methodsmentioning

confidence: 99%

Sedimentary Records of DDT and HCH in the Pearl River Delta, South China

Zhang

Parker

House

et al. 2002

Environ. Sci. Technol.

344

194

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Tropical regions in developing countries are thought to be significant sources of organochlorine pesticides in the global context, owing to high rate of use and only a recent production ban or restriction on application of these pesticides. In the present paper, DDT and HCH in eight 210Pb-dated sedimentary cores from the Pearl River Delta, South China, were analyzed in order to reconstruct the time trends of these persistent organic pollutants in this tropical region. The sedimentary inventories of sigmaDDT and sigmaHCH through the cores ranged from 36.6 to 1109.5 ng/cm2 and from 11.2 to 226.3 ng/cm2, respectively, and their spatial distribution implies that the water flows from the Humen, Jiaomen, Hongqili, and Hengmen outlets rather than the Xijiang flow from Modaomen outlet, supplied the major historical input of DDT to the estuary. Although a production ban of technical HCH and DDT was imposed in China in 1983, their sedimentary fluxes display increasing trends or strong rebounds in the 1990s as recorded in the core profiles, characteristic of the increasing ratios of (DDE + DDD)/DDT and DDE/DDT. It is suggested that an enhanced land soil runoff in the process of large-scale land transform, as well as a higher river water flow in early 1990s, had mobilized these pesticides from soil to the sedimentary system in the region.

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“…During the 1970s and early 1980s, China was the largest producer and consumer of technical HCH (60-70% a-HCH, 5-12% b-HCH, 10-12% c-HCH and 6-10% d-HCH) (Willett et al 1998) in the world with an increasing production from zero (1952) to nearly 300 thousand tons per year (Li et al 1998) because of the intense food production pressure, and was officially banned in China in the middle 1980s. As a substitute, lindane ([ 99% c- HCH) has been used in agriculture since 1990 (Li et al 2001). Therefore, the a-HCH/c-HCH (a/c) ratio is in the range of 3-7 for technical HCH, whereas low a/c ratio depicts the usage of lindane (Li et al 1998;Vu Duc et al 2009).…”

Section: Occurrence Of Ocps In Shaying River Basinmentioning

confidence: 99%

Residues of organochlorine pesticides (OCPs) in aquatic environment and risk assessment along Shaying River, China

Bai

Ruan

Hoek

2018

Environ Geochem Health

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Organochlorine pesticides (OCPs) are pesticides with global scale ubiquity, persistence and bioaccumulation, which leave long-term residuals in the water body. OCPs' high toxicity poses significant threats to human health and aquatic biodiversity, making assessment of OCPs' impact on aquatic ecology and human health urgently necessary. In this research, the presence of 16 OCPs in surface water and groundwater along Shaying River, China, as well as OCPs concentration correlations, was investigated at 24 selected sampling sites. At the same time, the ecological risk and human carcinogenic risk were also analyzed by risk quotient method and USEPA's Risk Assessment Guidance, respectively. Results showed that the total concentration of OCPs ranged from 21.0 to 61.4 ng L in groundwater, and 12.3-77.5 ng L in surface water. Hexachlorocyclohexane (HCHs) and heptachlor were the prominent contaminants in groundwater, which indicated their use in the recent past and confirmed their persistence. The α-HCH/γ-HCH ratios in groundwater confirmed that γ-HCH (lindane) was used as main substitute of technical HCH in the study area. The correlation analysis illustrated that δ-HCH and γ-HCH played a dominant role in HCHs residue. Heptachlor and α-HCH, as well as endosulfan and heptachlor epoxide, had a strongly significant positive correlation, suggesting an associated usage of the two pair OCPs. An extremely high ecological risk for aquatic organism was observed for γ-HCH, heptachlor and dieldrin, while the carcinogenic risks posed by the selected OCPs in surface water and groundwater were all acceptable.

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Distribution of Organochlorine Pesticides in a Sediment Profile of the Pearl River Estuary

Abstract: This is the Pre-Published Version.

Cited by 18 publications

References 15 publications

Assessment of Organochlorine Pesticide Residues in the Surface Sediments of River Yamuna in Delhi, India

Assessment of Organochlorine Pesticide Residues in the Surface Sediments of River Yamuna in Delhi, India

Sedimentary Records of DDT and HCH in the Pearl River Delta, South China

Residues of organochlorine pesticides (OCPs) in aquatic environment and risk assessment along Shaying River, China

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