Distribution, regional sources and deposition fluxes of organochlorine pesticides in precipitation in Guangzhou, South China

Huang, Diying; Peng, Ping’an; Xu, Yi–Gang; Sun, Cui-Xiang; Deng, Hongmei; Deng, Yunyun

doi:10.1016/j.atmosres.2010.03.013

Cited by 28 publications

(16 citation statements)

References 29 publications

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“…Note that, compared to the previous studies on the PRD, our o,p'-/p,p'-DDT ratios were far lower than those reported for precipitation (1.10-6.84) in 2005 (Huang et al 2010). Our ratios were also lower than those (0.2-6.8) measured for the particle and gas phases in the winter, spring, and fall seasons of 2004, but were close to those of the summer season (<1) .…”

Section: Sourcescontrasting

confidence: 94%

“…As a result, the DDT/ (DDD + DDE) ratio decreases as a function of time. In this study, our data showed that the ratios of DDT/ (DDD + DDE) in dry deposition and bulk deposition samples ranged from 1.9 to 31.4 and 1.0 to 8.3, with average ratios of 7.5 and 3.1, respectively, consistent with the previous studies in the PRD region (Yang et al 2008;Huang et al 2010). These results also implied that there were fresh inputs of DDT in the PRD.…”

Section: Sourcessupporting

confidence: 90%

“…In this study, the average ratio of α-/β-endosulfan was 0.62 and 1.14 from dry deposition and bulk deposition samples, which was much lower than about 2.33, suggesting that endosulfan was aged and that there was little or no considerable fresh input of technical endosulfan in the PRD. The ratio of 0.62 was consistent with the ratios (about 0.4) reported for particulate phase of precipitation in Guangzhou (Huang et al 2010). Previous studies proposed that the residues of endosulfan in the atmosphere of the PRD region may be mainly transported by the Asian winter monsoon from the cotton fields of Eastern China Huang et al 2010).…”

Section: Sourcessupporting

confidence: 87%

“…The fluxes of ΣDDTs accounted for about 61±25 % of the total OCPs, ranged from 0.60 to 978(122)ng m −2 month −1 , OCP deposition fluxes obtained in this study were comparably lower than those reported previously in the literatures (Wang et al 2007;Huang et al 2010;Li et al 2010;Li et al 2011;Yue et al 2011). The bulk deposition fluxes of OCPs of our study were lower than Huang's report of wet deposition fluxes of 756, 842, and 298 ng m −2 month −1 for ΣHCHs, ΣEndos (α + β) and ΣDDTs (p,p'-DDD+p,p'-DDT) during the rainy season of 2005 in Guangzhou (Huang et al 2010). The bulk deposition fluxes of DDTs of our study were also lower than those (67 to 917 ng m −2 month −1 , with mean value of 350 ng m −2 month −1 ) reported for the particle deposition in 15 sites of the PRD in 2004 (Li et al 2010).…”

Section: Ocp Concentrations and Fluxessupporting

confidence: 45%

“…Despite a long record of OCPs in different environmental compartments in this region, few data exist on atmospheric deposition, especially dry deposition fluxes of these contaminants. Previous studies concerned OCPs precipitation in two sites of Guangzhou (Huang et al 2010), DDTs in air and precipitation of three urban sites in the PRD (Yue et al 2011), and DDTs in particle deposition of the PRD (Li et al 2010). Yue et al also estimated indirectly dry depositional fluxes of DDTs in three urban sampling sites of the PRD (Yue et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric depositional fluxes and sources apportionment of organochlorine pesticides in the Pearl River Delta region, South China

Huang

Song

Zhang

et al. 2013

Environ Monit Assess

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Organochlorine pesticides (OCPs) have variously been phased out in agricultural activities, but they are still widely detected in air, water, and soil systems due to their recalcitrant nature in the environment. The purposes of this study were to assess potential OCP pollution via dry and wet deposition over the fast developing Pearl River Delta area with 41,700 km 2 , where the main effort has been focused on emerging pollutants such as petroleum hydrocarbons and PM2.5. We quantified both the dry and wet deposition fluxes of 19 OCPs including dichlorodiphenyltrichloroethanes (DDTs), endosulfans (Endos), and hexachlorocyclohexanes (HCHs). The results showed that each year about 67.4, 42.0, 15.0, and 8.07 kg of total OCPs, DDTs, Endos, and HCHs were returned to the ground, among which 11.7, 10.4, 0.84, and 0.16 kg were in the dry deposition forms. The large spatial variations in OCP deposition fluxes indicated that OCP pollution in the air is mainly influenced on local scales because evaporation from local soil is likely the major source of the phased out OCPs. Source analysis indicated that DDTs may be still in use as antifouling agent and/or dicofol, but Endos and HCHs were mainly derived from the residual of historical usage. The study suggests that the historical OCP pollutants are persistent at high levels in this area and should not be overlooked, while we tackle emerging pollutants.

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Section: Sourcescontrasting

confidence: 94%

Section: Sourcessupporting

confidence: 90%

Section: Sourcessupporting

confidence: 87%

Section: Ocp Concentrations and Fluxessupporting

confidence: 45%

Section: Introductionmentioning

confidence: 99%

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Atmospheric depositional fluxes and sources apportionment of organochlorine pesticides in the Pearl River Delta region, South China

Huang

Song

Zhang

et al. 2013

Environ Monit Assess

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Atmospheric deposition and air‐sea gas exchange fluxes of DDT and HCH in the Yangtze River Estuary, East China Sea

Lin

et al. 2017

JGR Atmospheres

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The Yangtze River Estuary (YRE) is strongly influenced by the Yangtze River and lies on the pathway of the East Asian Monsoon. This study examined atmospheric deposition and air‐sea gas exchange fluxes of dichlorodiphenyltrichloroethane (DDT) and hexachlorocyclohexane (HCH) to determine whether the YRE is a sink or source of selected pesticides at the air‐water interface under the influences of river input and atmospheric transport. The air‐sea gas exchange of DDT was characterized by net volatilization with a marked difference in its fluxes between summer (140 ng/m2/d) and the other three seasons (12 ng/m2/d), possibly due to the high surface seawater temperatures and larger riverine input in summer. However, there was no obvious seasonal variation in the atmospheric HCH deposition, and the air‐sea gas exchange reached equilibrium because of low HCH levels in the air and seawater after the long‐term banning of HCH and the degradation. The gas exchange flux of HCH was comparable to the dry and wet deposition fluxes at the air‐water interface. This suggests that the influences from the Yangtze River input and East Asian continental outflow on the fate of HCH in the YRE were limited. The gas exchange flux of DDT was about fivefold higher than the total dry and wet deposition fluxes. DDT residues in agricultural soil transported by enhanced riverine runoff were responsible for sustaining such a high net volatilization in summer. Moreover, our results indicated that there were fresh sources of DDT from the local environment to sustain net volatilization throughout the year.

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Atmospheric Deposition of Organochlorine Pesticides (OCPs): Species, Levels, Diurnal and Seasonal Fluctuations, Transfer Velocities

Eker

Taşdemir

2018

Arch Environ Contam Toxicol

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Distribution, regional sources and deposition fluxes of organochlorine pesticides in precipitation in Guangzhou, South China

Cited by 28 publications

References 29 publications

Atmospheric depositional fluxes and sources apportionment of organochlorine pesticides in the Pearl River Delta region, South China

Atmospheric depositional fluxes and sources apportionment of organochlorine pesticides in the Pearl River Delta region, South China

Atmospheric deposition and air‐sea gas exchange fluxes of DDT and HCH in the Yangtze River Estuary, East China Sea

Atmospheric Deposition of Organochlorine Pesticides (OCPs): Species, Levels, Diurnal and Seasonal Fluctuations, Transfer Velocities

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