ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Shan Huang,Qicong Song,Weiwei Hu,Bin Yuan,Junwen Liu,Bin Jiang,Wei Li,Caihong Wu,Fan Jiang,Wei Chen,Xinming Wang,Min Shao
Atmospheric amines have attracted increasing attention due to their significant impact on new particle formation, particle hygroscopicity and particle optical properties . In this study, four low-molecule-weight amines were detected from PM 2.5 filter samples collected at an urban site of Pearl River Delta (PRD) region of China in 2018 autumn. During the campaign, the mass concentrations of ambient particulate methylamine (MA, CH 3 NH 2 ), dimethylamine (DMA, (CH 3 ) 2 NH), trimethylamine (TMA, (CH 3 ) 3 N), and diethylamine (DEA, (C 2 H 5 ) 2 NH) were quantified at daily or 12-h resolution using an optimized Ion Chromatograph (IC) method. The total measured amine concentration was 297 ± 209 ng/m 3 , which can account for 0.76 ± 0.33% of PM 2.5 mass concentrations. The particulate amines in PRD urban area were dominated by MA (243 ± 179 ng/m 3 ), accounting for over 80% of total amines, then followed by DMA (49 ± 30 ng/m 3 , 16.5%), TMA (4 ± 2 ng/m 3 ) and DEA (1 ± 1 ng/m 3 ). Based on the correlation analysis, MA and DMA mainly presented as nitrate and sulfate salts. We speculate the amines tend to react with gas-phase HNO 3 or particle-phase nitrate to form particulate amine salts via local process in Guangzhou. As the relative humidity (RH) increased, enhanced partitioning of amine towards the particle phase was observed. Using approach of multiple linear regression, 71% of the particulate amines in PRD urban site could be explained by acid-base process and the rest by primary emissions from combustion sources (29%).
研究领域:
环境科学
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大气化学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 21
·4100
·
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
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN OCEANOGRAPHY
·
2016
·
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
·
生物地球化学
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产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
·
2022
·
IF 2.582
Zhang Huike,Zhang Chao,Huang Yifeng,Yi Xiaohui,Liang Xujun,Chang-Gu Lee,Huang Mingzhi,Ying Guang-Guo
The occurrence and distribution of six phthalate acid esters (PAEs) in surface water and sediment of the Pearl River were investigated, including Xijiang River (XR), Beijiang River (BR), Lingdingyang Estuary (LE), and Guangzhou River (GR) in South China. Six target PAEs were identified in surface water and sediment at almost all sites in the Pearl River, with di(2-ethyl-ethyl) phthalate (DEHP) and dibutyl phthalate (DBP) as dominant PAEs. Total 6 PAEs (ΣPAEs) in surface water and sediment ranged from 1,797.5 to 4,968.5 ng L−1 and 95.24 to 3,677.26 ng g−1 dw, respectively. In addition, the contamination levels of PAEs in the Pearl River are in the following order: XR > BR > GR > LE for surface water and BR > XR > GR for sediment. Local agricultural activities, industrial production, water confluence, and seawater intrusion are the probable sources of PAEs in the Pearl River. Based on correlation analysis, the possible collocation patterns of different PAEs were revealed. The risk assessment indicates that residual PAEs in the Pearl River pose a serious threat to the ecological environment. According to risk characterization of fish living in the Pearl River, the decreasing order of health risks was: GR > LE > XR > BR.
研究领域:
环境科学
·
公共卫生
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Yongyan Chen,Jia Lyu,Shenghua Gao,Bixiong Ye,Lan Zhang
In this study, the raw water, finished water, and tap water of various waterworks in major river basins of China were collected for the determination of the neonicotinoid insecticides (NNIs). The results showed that one or more NNIs were detected in 81.2% of the water samples, and the total concentration of NNIs (∑NNIs, sum of eight NNIs) ranged from 0.10 to 210.33 ng/L, with a median of 7.08 ng/L. Thiamethoxam, imidacloprid, and clothianidin had the highest contribution rate among the major ∑NNIs detected. The concentration of ∑NNIs detected in the Pearl River was higher than that in other river basins, with a median of 51.11 ng/L. During the dry season, the detection rate of ∑NNIs was 77.4%, with concentrations ranging from 0.10 to 210.33 ng/L. During the wet season, the detection rate of ∑NNIs was 85%, and the concentration of ∑NNIs ranged from 0.10 to 117.03 ng/L. The estimated daily intake (EDI) of NNIs in the raw water and drinking water of each river basin is less than the reference dose (RfD) of imidacloprid. The potential risk of NNIs can be reduced by further optimizing the water treatment processes.
研究领域:
环境科学
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毒理学
·
公共卫生
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2017
·
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
·
生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
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
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENT INTERNATIONAL
·
2024
·
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
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOLOGICAL INDICATORS
·
2022
·
IF 6.263
Qunpo Jia,Yanpeng Cai,Xiao Yuan,Xiaodong Zhang,Bowen Li,Bo Li
Neonicotinoid insecticides (NEOs) are widely used in many urban regions. Studies on NEOs residues in urban tidal streams and the associated ecological risks are limited. In this study, the occurrence, spatiotemporal distribution, and ecological risks of seven selected NEOs in the Wuchong Stream in Guangzhou, China were investigated. Moreover, the correlation between typical urban factors and the ecological risk of NEOs was discussed. In the Wuchong Stream, the concentrations of NEOs in the water samples ranged from 0.97 to 175.92 ng. L -1 in the dry season and 3.15 to 312.92 ng. L -1 in the wet season.The most commonly used neonicotionoids were acetamiprid and imidacloprid in the Wuchong Sream basin. The concentrations of NEOs in the midstream were higher than that in the downstream and upstream. The results of the ecological risk indicated that NEOs were likely to biologically impair the urban stream ecosystem, especially in the dry season. For three typical aquatic organisms, the current concentrations of NEOs posed a significant threat to aquatic insects. Compared to other urban factors, residentidal district and farmland area were the main socioeconomic factors affecting the ecological risk of NEOs in the Wuchong Stream basin. Therefore, the correct and reasonable application of NEOs and continuous improvement of the applicant methods can reduce the environmental risks of urban streams.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
MARINE POLLUTION BULLETIN
·
2025
·
IF 4.9
Hao-jie Zheng,Xu-feng Wang,Ye-ni Zhang,Chao-ping Hou,Ke Huang
Diazepam (DIAZ), a widely prescribed benzodiazepine for insomnia and anxiety, has been frequently detected in aquatic ecosystems, raising concerns about potential impacts on human and animal health. To investigate its environmental presence, water and sediment samples were collected from 187 aquaculture ponds across the Pearl River Delta, China. The concentrations of DIAZ and its metabolites—nordazepam (NDZ), oxazepam (OXZ), and temazepam (TEM)—were determined using ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS). Detection frequencies in water ranged from 0.535 % to 58.8 %, with concentrations from below detection (nd) to 392 ng·L −1 , whereas in sediments, frequencies ranged from 1.07 % to 35.8 %, with levels from nd to 1.66 μg·kg −1 . Marked spatial variability was evident, with aquaculture ponds in Foshan (FS) exhibiting the highest DIAZ concentration (392 ng·L −1 ), while Zhongshan (ZS) displayed higher detection frequencies but lower concentrations. Fish ponds contained significantly greater cumulative concentrations of DIAZ and its metabolites compared with shrimp ponds. Strong positive correlations were identified between DIAZ in water and DIAZ and NDZ in sediments. Similarly, NDZ in water was strongly correlated with NDZ and DIAZ in sediments, and TEM in water showed significant correlations with DIAZ and NDZ in sediments. Environmental risk assessment revealed that NDZ and OXZ presented low ecological risks in both matrices at all sites, whereas DIAZ and TEM posed medium to high risks at certain water sites, with DIAZ also showing medium risks in some sediments. The study provides an integrated evaluation of occurrence, spatial distribution, and ecological risks of DIAZ and its metabolites in aquaculture systems, offering critical evidence to support food safety measures and strategies for pharmaceutical pollution control in the Pearl River Delta.
研究领域:
环境科学
·
药物代谢
·
生态毒理学
·
水生生态系统
·
环境污染
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Pengfei Wu,Yu Zhao,Ngai Kwan Chan,Jian-Wen Qiu,Zongwei Cai
Microplastics are widely recognized as significant marine pollutants with health implications, yet their abundance patterns, sources, and environmental determinants remain unknown in many regions. In this study, we surveyed 31 sites to assess the status of microplastic pollution in the surface waters of Hong Kong, one of the most densely populated cities in Southern China. Microplastics (20 μm–5 mm) were detected at all survey sites, with abundances ranging from 29 to 2.7 items/L (mean: 14.4 ± 8.6 items/L) along an estuary-to-ocean gradient. The highest abundances were observed in the western estuarine sites, which receive substantial river runoff, and within Victoria Harbour, which receives effluents from a major sewage treatment plant. Low-density polymers such as polypropylene (PP) and polyethylene (PE) were predominant, while high-density polymers like polyethylene terephthalate (PET) and polyvinyl chloride (PVC) were less abundant, except near sewage outfalls in Victoria Harbour. High concentrations of polystyrene (PS) in Deep Bay, an oyster culture area, suggest that Styrofoam used in local oyster culture rafts is a potential pollution source. Multivariate analyses indicate that microplastic pollution in Hong Kong is influenced by local environmental factors, with four environmental proxies—salinity, chlorophyll a, E. coli , and total inorganic nitrogen—accounting for a significant portion of the spatial pattern in microplastic abundance. Overall, our study disentangles the complex influences of the Pearl River and local human activities on the abundance and distribution of microplastics in Hong Kong waters, highlighting the complexity of tracing the sources of these pollutants.
研究领域:
环境科学
·
海洋生态学
·
污染毒理学
·
环境微生物学
·
水文学
·
城市生态学
·
分析化学
·
环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Mengqiang He,Xiaolei Teng,Junyan Wei,Xiaoyu Li,Zunyao Wang
o,p’-dichlorodiphenyltrichloroethane (2,4′-DDT) is a typical persistent organic pollutant (POP) characterized by environmental persistence and acute toxicity. Its pronounced hydrophobicity drives preferential adsorption onto suspended particulate matter (SPM) in aquatic systems. This study systematically investigated the photochemical transformation mechanism of 2,4′-DDT in the Pearl River SPM-water system. Environmental factor analysis revealed negligible effects from pH and cations on 2,4′-DDT photodegradation, while NO 3 − and HCO 3 − inhibited degradation via competitive UV absorption and reactive species quenching. Reaction mechanisms were probed through H 2 O 2 -enhanced hydrophilic reactive oxygen species (ROS) generation, revealing dual photosensitizing and ROS-quenching roles of dissolved organic matter (DOM) in SPM. Hydrophobicity-dependent degradation patterns were revealed through quenching experiments and comparative POPs studies, demonstrating that hydrophilic-region ROS (particularly •OH) contributed dominantly to 2,4′-DDT degradation compared to hydrophobic-region ROS. The LC-MS and GC-MS analyses identified three transformation pathways: dechlorination, elimination, and hydroxylation. Theoretical calculations confirmed C-Cl bond cleavage and elimination feasibility, with •OH attacking benzene-ring carbons at minimal energies, explaining the formation of hydroxylated products. Notably, toxicity assessments revealed enhanced hazards of dechlorination and elimination photoproducts to humans and aquatic organisms than the parent compound.
研究领域:
环境化学
·
光化学
·
污染科学
·
生态毒理学
·
水环境研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）