International Journal of Environmental Research and Public Health
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2019
·Vol. 16
·期 21
·4100
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IF 2.468
Qi Chen,Yu Lan,Jian Shi,Weijie Liu,Bo Zhu,Dong Sun,Shunshan Duan
Sediment cores were collected from four outlets in the Pearl River Estuary (Guangdong Province, China) and dated using the210Pb method to investigate the pollution history of the area due to its relatively stable sedimentation status and hydrographic conditions in recent decades. The ages of the sediment cores were dated over 40 years (1968–2015). The concentrations at the four outlets ranged from 2.21 to 48.52 ng g−1dw for nonylphenol and were non-detectable for 23.64 ng g−1dw for bisphenol A (BPA), which exhibited a decreasing trend from north to south as well as seaward. The fluxes (2.84 to 112.91 ng cm−2yr−1and non-detectable to 59.33 ng cm−2yr−1for nonylphenol and bisphenol A, respectively) stabilized in the 1980s to 1990s due to the construction of sewage treatment systems. The fluxes increased again in the 21st century, which reached a peak ca. 2010 but declined in recent years due to the establishment of regulations and the decreasing number of industrial enterprises. Fluctuations in the pollution composition coincided with industrial development and governmental policies.Keywords:nonylphenol;bisphenol A;dry mass sedimentation rates;historical trends;Pearl River Estuary
研究领域:
环境科学
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生态学
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PubMed
高影响因子
PROGRESS IN OCEANOGRAPHY
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2016
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IF 3.512
Zhengchao Wu,Qian P. Li
This study reports the first comprehensive exploration of the spatial patterns of dissolved and particulate polyunsaturated aldehydes (PUAs), their physical and biological controlling factors, and their potential biogeochemical influences in the Pearl River Estuary (PRE) of the northern South China Sea (NSCS). High levels of total particulate PUAs (0–41 nM) and dissolved PUAs (0.10–0.37 nM) were observed with substantial spatial variation during an intense summer phytoplankton bloom outside the PRE mouth. We found the particulate PUAs strongly correlated with temperature within the high chlorophyll bloom, while showing a generally positive correlation with chlorophyll- a for the entire region. Additionally, the Si/N ratio significantly correlated with the particulate PUAs along the estuary suggesting the important role of silica on PUA production in this region. The dissolved PUAs counterparts exhibited a positive correlation with chlorophyll- a within the high chlorophyll bloom, but a negatively one with temperature outside, reflecting the essential bio-physical coupling effects on the dissolved PUAs distributions in the ocean. Biogeochemical implications of PUAs on the coastal ecosystem include not only the deleterious restriction of high PUAs-producing diatom bloom on copepod population, but also the profound influence of particulate PUAs on the microbial cycling of organic carbon in the NSCS.
研究领域:
海洋生物学
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生态学
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生物地球化学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2017
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IF 4.9
Panpan Diao,Qi Chen,Rui Wang,Dong Sun,Zhuoping Cai,Hao Wu,Shunshan Duan
Abtsract Three phenolic endocrine-disrupting compounds, 4-nonylphenol, 4-tert-octylphenol and bisphenol A, were determined in water, sediment and biota (fish, shrimp and mollusk) collected from sites along the Pearl River Estuary, China. The 4-nonylphenol, 4-tert-octylphenol and bisphenol A concentrations ranged from 1.20–3352.86 ng/L in the water, < 0.17–20.80 ng/g dw in the sediment and < 1.49–237.12 ng/g dw in the biota. The concentrations of 4-nonylphenol were higher than those of 4-tert-octylphenol and bisphenol A in the water, sediment and organisms. Moreover, the bioconcentration factors (BCFs) and biota-sediment accumulation factors (BSAFs) of 4-nonylphenol and bisphenol A were calculated, and were found to be higher for 4-nonylphenol and in demersal organisms. To assess co-exposure to phenolic endocrine-disrupting compounds, the 4-nonylphenol equivalent was employed to evaluate the potential risks to aquatic organisms and human health, and the results indicated a low risk.
研究领域:
环境科学
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生态毒理学
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
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IF 11.4
Qianyi Huang,Rui Hou,Lang Lin,Hengxiang Li,Shan Liu,Yuanyue Cheng,Xiangrong Xu
The accumulation and trophodynamics of organophosphate flame retardants (OPFRs) and their metabolites were investigated in the estuarine food web of the Pearl River, China. The mean ∑OPFR concentration among the investigated species increased in the following order: fish [431 ± 346 ng/g lipid weight (lw)] < snail (1310 ± 621 ng/g lw) < shrimp (1581 ± 1134 ng/g lw) < crab (1744 ± 1397 ng/g lw). The di-alkyl phosphates (DAPs) of di-(n-butyl) phosphate (DNBP), bis(2-butoxyethyl) phosphate (BBOEP), and diphenyl phosphate (DPHP) were the most abundant metabolites, with concentrations same as or even higher than their corresponding parent compounds. The log bioaccumulation factors for most OPFRs were lower than 3.70, and significant biomagnification was only found for trisphenyl phosphate [TPHP, with the trophic magnification factors (TMFs) > 1]. The TMFs of OPFRs, except for TPHP and tributyl phosphate had a positive correlation with lipophilicity (log KOW, p ≤ 0.05) and a negative correlation with the biotransformation rate (log KM, p ≤ 0.05). The mean TMF > 1 was observed for all of the OPFR metabolites based on the bootstrap regression method. The “pseudo-biomagnification” of OPFR metabolites might be attributed to the biotransformation of OPFRs in organisms at high trophic levels.
研究领域:
环境科学
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生态学
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PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
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2024
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IF 10.3
Qian-Yi Huang,Rui Hou,Ru Xu,Lang Lin,Heng-Xiang Li,Shan Liu,Pei-Yuan Qian,Yuan-Yue Cheng,Xiang-Rong Xu
Estuaries serve as crucial filters for land-based pollutants to the open sea, but there is a lack of information on the migration and fate of organophosphate flame retardants (OPFRs) within estuaries. This study focused on the Pearl River Estuary (PRE) by examining the co-occurrence of OPFRs and their metabolites and quantifying their transport fluxes using a mass balance model. The seawater concentrations of OPFRs and their metabolites exhibited significant seasonal variations ( p < 0.01), while the sediment concentrations of OPFRs reflected the long-term distributional equilibrium in the PRE. The concentration of Σ 9 OPFRs in seawater showed a relentless dilution from the entrance to the offshore region in the normal and wet seasons, which was significantly in accordance with the gradients of pH, dissolved oxygen (DO), and salinity ( p < 0.05). Furthermore, horizontal migration dominated the transport of OPFRs, and the inventory assessment revealed that both the water column and sediment were important reservoirs in the PRE. According to the estimated fluxes from the mass balance model, riverine input emerged as the principal pathway for OPFR entry into the PRE (1.55 × 10 5 , 6.28 × 10 4 , and 9.00 × 10 4 kg/yr in the normal, dry and wet seasons, respectively), whereas outflow to the open sea predominantly determined the main fates of the OPFRs. The risk quotient (RQ) results showed that EHDPHP (0.835) in water posed medium ecological risk, while other OPFRs and metabolites presented relatively lower risk (RQ < 0.1). The risk control effects were evaluated through scenario simulations of mathematical fitting between controllable source factors and the RQ of risky OPFR. The risk of EHDPHP in the PRE could be effectively reduced by restricting its concentrations in entrance region (<9.31, 8.67, and 12.7 ng/L in the normal, dry and wet seasons, respectively) of the PRE. This research offers foundational insights into environmental management and pollution control strategies for emerging pollutants in estuaries.
研究领域:
环境科学
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生态学
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PubMed
高影响因子
ENVIRONMENTAL POLLUTION
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2025
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IF 7.3
Xiaoxiao Chen,Qianyi Huang,Rui Hou,Shan Liu,Hengxiang Li,Tiantian Chen,Xiangrong Xu
The estuarine environment is a complex and dynamic ecosystem in the transition zone where rivers meet the sea. However, information on the distribution, fate, and risks of novel organic ultraviolet filters and stabilizers (OUVs) in estuaries remains limited. In this study, the occurrence of benzotriazole (BT) and benzothiazole (BTH) derivatives in seawater, suspended particulate matter (SPM) and sediments in the Pearl River Estuary (PRE) was analysed. The total concentrations of both types of derivatives were much lower than those of their parent compounds in all the samples. 2-(2-Hydroxy-3-tert-butyl-5-methyl-phenyl)-5-chloro-benzotriazole (UV-326) and 5-methyl-1H-benzotriazole (5-TTri) were the main contributors to the total occurrence of BT derivatives in seawater, whereas UV-326 and 5-chloro-2-(3,5-di-tert-butyl-2-hydroxyphenyl) benzotriazole (UV-327) emerged as significant derivatives in sediments. 2-mercapto-benzothiazole (2-SH-BTH) and 2-thiocyanomethylthio-benzothiazole (2-SCNMeS-BTH) were the most important BTH derivatives in seawater and sediments, respectively. The mass balance modelling results indicated that riverine and coastal discharges serve as the primary input pathways for BT derivatives (1.50 × 10 4 and 8.29 × 10 3 kg/yr in summer and winter, respectively) and BTH derivatives (1.32 × 10 4 and 9.46 × 10 3 kg/yr in summer and winter, respectively) into the PRE. Moreover, outputs to the outer ocean play a decisive role in determining their main fates, with contributions ranging from 69.3 % to 84.3 %. The sedimentation and degradation of BT and BTH derivatives were not the primary sinks in seawater, suggesting that the estuary cannot serve as a significant barrier for these land-based pollutants. The risk quotient (RQ) results indicated that 2-SCNMeS-BTH has a moderate ecological risk (RQ of 0.105) in sediments, whereas all other BTs and BTHs have a relatively low risk (RQ < 0.1). This investigation offers pivotal insights into the environmental behaviours and ecological impacts of emerging marine pollutants within estuarine ecosystems.
研究领域:
环境科学
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海洋污染研究
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生态毒理学
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水化学
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环境监测
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PubMed
高影响因子
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