Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 8 de 8
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
Huan Jing Ke Xue ; 41(1): 205-212, 2020 Jan 08.
Artigo em Chinês | MEDLINE | ID: mdl-31854921

RESUMO

We explored the pollution characteristics, spatial and temporal distribution, ecological risk, and human health risk of organophosphate esters (OPEs) in the source water of the Nanjing section of the Yangtze River. Thirteen OPEs were determined by solid phase extraction-high performance liquid chromatography-tandem mass spectrometry. The results showed that twelve OPEs were detected to different extents with total concentrations ranging from 85.21 to 1557.96 ng·L-1[excluding tris (2,3-dibromopropyl) phosphate]. Chloroalkyl phosphate was the main compound and tris(2-chloroethyl) phosphate (TCEP) was the most abundant of the thirteen OPEs, which reached up to 447.08 ng·L-1. Seasonal variation of OPEs showed that the concentrations of OPEs in summer ranged from 220-1557.96 ng·L-1, with the average concentration of 493.78 ng·L-1 being 1.7-2.6 times higher than of that in spring and autumn. An ecological risk assessment showed that tricresyl phosphate and 2-ethylhexyl diphenyl phosphate were associated with moderate or high risks to organisms (algae, crustaceans, and fish). At a high exposure concentration, the total non-carcinogenic risk of OPEs in source water ranged from 4.41×10-3-2.91×10-2, with the highest risk being associated with children aged 0-3 months. The total cancer risk value was 5.88×10-7-3.89×10-6, among which TCEP and Tris(1,3-dichloro-2-propyl) phosphate was associated with a potential risk for children. We conclude that the long-term exposure risk for children of OPEs in the source water of the Nanjing section of the Yangtze River deserve more attention.


Assuntos
Monitoramento Ambiental , Retardadores de Chama/análise , Organofosfatos/análise , Rios/química , Poluentes Químicos da Água/análise , Animais , China , Ésteres/análise , Humanos , Lactente , Recém-Nascido , Medição de Risco , Estações do Ano
2.
Huan Jing Ke Xue ; 40(12): 5286-5293, 2019 Dec 08.
Artigo em Chinês | MEDLINE | ID: mdl-31854599

RESUMO

Occurrence characteristics of antibiotics in the source water of the Nanjing section of the Yangtze River were analyzed preliminarily by solid-phase extraction and high-performance liquid chromatography-tandem mass spectrometry (SPE-HPLC-MS/MS). The results showed that the cumulative concentration of 16 sampling points ranged from 13.37 ng·L-1 to 780.5 ng·L-1, with an average concentration of 92.95 ng·L-1. Four sulfonamides, three fluoroquinolones, one tetracycline, five macrolides, and one chloramphenicol antibiotic were detected with average concentration ranging from 0.14 ng·L-1 to 49.91 ng·L-1,including enrofloxacin (ERX) and clarithromycin (CLR) with the highest detection rate of 100%, and clindamycin (CLI) with the highest concentration of 739.44 ng·L-1. Overall, the concentration levels of antibiotics in the Nanjing section of the Yangtze River were low compared with other rivers and lakes in China. The risk assessment results showed that the largest cumulative risk of S2 was 0.31, and the environmental risk of sulfamethoxazole (SMX), doxycycline (DOX), and roxithromycin (ROX) had lower risk levels;the health risk indexes of nine antibiotics for different age groups were between 2.22×10-6and 4.86×10-3, while CLI and DOX are the main potential health risk factors for humans.


Assuntos
Antibacterianos , Medição de Risco , Rios , Poluentes Químicos da Água , China , Monitoramento Ambiental , Humanos , Espectrometria de Massas em Tandem , Água
3.
Huan Jing Ke Xue ; 40(7): 3249-3256, 2019 Jul 08.
Artigo em Chinês | MEDLINE | ID: mdl-31854725

RESUMO

To determine the removal efficiency of typical antibiotics in Guiyang wastewater treatment plants (WWTPs) and the impact of effluent on aquatic organisms in receiving waters, nine antibiotics in the influent, effluent, and receiving water of two WWTPs in Guiyang City were investigated. The concentrations of antibiotics in the influent and effluent ranged from 0 to 835.60 ng·L-1 and 0 to 286.60 ng·L-1, respectively, and the concentration of ofloxacin (OFX) was highest. Its concentration in the influent was 835.60 ng·L-1 and 539.00 ng·L-1 and in the effluent was 11.74 ng·L-1 and 286.60 ng·L-1, respectively. The removal rate of antibiotics in the WWTPs ranged from -42.29% to 100%, and tetracycline (TC) was completely removed. The concentrations of antibiotics in the influent and effluent of the WWTPs in Guiyang City was less than in other regions of China and in other counties. Through the analysis of the antibiotics in the receiving waters, it was found that the concentrations of OFX were higher than other antibiotics, and the WWTPs effluent was one source of antibiotics in the receiving waters. OFX showed a high risk (RQ>1) for aquatic organisms in the receiving waters, as determined by an ecological risk assessment.


Assuntos
Antibacterianos/análise , Ofloxacino/análise , Águas Residuárias/análise , Poluentes Químicos da Água/análise , China , Cidades , Monitoramento Ambiental , Medição de Risco , Eliminação de Resíduos Líquidos
4.
Environ Sci Pollut Res Int ; 24(6): 5773-5780, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28050763

RESUMO

Hydroxylated polybrominated diphenyl ethers (OH-PBDEs) have been frequently observed in marine aquatic environments; however, little information is available on the occurrence of these compounds in freshwater aquatic environments, including freshwater lakes. In this study, we investigated the occurrence and spatial distribution of typical OH-PBDEs, including 2'-OH-BDE-68, 3-OH-BDE-47, 5-OH-BDE-47, and 6-OH-BDE-47 in surface sediments of Taihu Lake. 3-OH-BDE-47 was the predominant congener, followed by 5-OH-BDE-47, 2'-OH-BDE-68, and 6-OH-BDE-47. Distributions of these compounds are drastically different between sampling site which may be a result of differences in nearby point sources, such as the discharge of industrial wastewater and e-waste leachate. The positive correlation between ∑OH-PBDEs and total organic carbon (TOC) was moderate (r = 0.485, p < 0.05), and site S3 and S15 were excluded due to point source pollution, suggesting that OH-PBDEs concentrations were controlled by sediment TOC content, as well as other factors. The pairwise correlations between the concentrations of these compounds suggest that these compounds may have similar input sources and environmental behavior. The target compounds in the sediments of Lake Taihu pose low risks to aquatic organisms. Results show that OH-PBDEs in Lake Taihu are largely dependent on pollution sources. Because of bioaccumulation and subsequent harmful effects on aquatic organisms, the concentrations of OH-PBDEs in freshwater ecosystems are of environmental concern.


Assuntos
Monitoramento Ambiental , Éteres Difenil Halogenados , Poluentes Químicos da Água , China , Ecologia , Sedimentos Geológicos , Lagos , Bifenil Polibromatos , Águas Residuárias
5.
Huan Jing Ke Xue ; 38(7): 2793-2800, 2017 Jul 08.
Artigo em Chinês | MEDLINE | ID: mdl-29964618

RESUMO

In this study, seven bisphenol analogues were measured in water and sediment samples from Taihu Lake, and potential risk was evaluated. The results showed that BPF, BPS and BPA were the predominant components in water samples from Lake Taihu. In sediment, BPA was always predominant, followed by BPF and BPS, and there was a significant positive correlation between BPs and TOC content. In addition, the high concentration levels of BPF, BPS and BPA were distributed in the tributaries of Lake Taihu(S4-S10). The risk assessment of the target BPs showed that the combined risk quotients posed a low eco-toxicity to aquatic ecosystem, and there was no appreciable risk to human health from potential environmental exposure of drinking water.


Assuntos
Compostos Benzidrílicos/análise , Monitoramento Ambiental , Sedimentos Geológicos/análise , Lagos/análise , Fenóis/análise , Poluentes Químicos da Água/análise , China , Humanos , Medição de Risco , Sulfonas/análise
6.
Huan Jing Ke Xue ; 38(1): 162-169, 2017 Jan 08.
Artigo em Chinês | MEDLINE | ID: mdl-29965043

RESUMO

A total of 22 water samples collected from Luomahu Lake were determined using high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) to evaluate the pollution level,spatial distribution and ecological risk of 32 PPCPs.23 PPCPs were detected in surface water of Luomahu Lake and the total concentrations of 22 samples were 892-1536 ng·L-1.The concentration of norfloxacin (256-707 ng·L-1) was the highest among the detected PPCPs,followed by ketoprofen (85-438 ng·L-1),acesulfame (101-290 ng·L-1) and naproxen (1.9-112 ng·L-1).Spatial differences were found in concentrations of PPCPs in various sampling sites.Concentrations of PPCPs in northeast of Luomahu Lake were higher than those of southwest.Concentration of PPCPs in Fangtinghe River was high and that of Zhangshanzha River was relatively low.The risk assessment of 13 pharmaceutical PPCPs showed that risk quotients (RQs) of norfloxacin were 0.26-0.72,posing medial risk to aquatic ecosystem.Gemifibrozil posed low ecological risks with RQs>0.01 in most sampling sites.RQs of other 11 PPCPs were less than 0.01,posing no ecological risks.The combined risk quotients of 12 PPCPs in water of Luomahu Lake were 0.29-0.75,indicating that those compounds posed an medial risk to aquatic ecosystem.Human health risk assessment showed that the RQs were less than one for 6 selected PPCPs,indicating that these compounds did not appear to pose an appreciable risk to human health by potential environmental exposure from drinking water.


Assuntos
Cosméticos/análise , Monitoramento Ambiental , Lagos/química , Preparações Farmacêuticas/análise , Poluentes Químicos da Água/análise , Humanos , Medição de Risco , Espectrometria de Massas em Tandem
7.
Ecotoxicol Environ Saf ; 135: 90-97, 2017 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-27721125

RESUMO

The occurrence and distribution of eight selected endocrine-disrupting chemicals were investigated in samples of surface water and suspended particulate matter (SPM) in Nanjing section of Yangtze River over a year (the flow period, the wet period and the dry period). All target compounds were detected at least once in surface water with 4-tert-butylphenol (4-TBP), nonyphenol (NP) and bisphenol A (BPA) as the dominant compounds, with concentrations in the range of 225-1121ng/L, 1.4-858ng/L and 1.7-563ng/L, respectively. Except for December, all selected compounds for the other sampling times were not found in all sampling points. NP (mean concentration 69.8µg/g) and BPA (mean concentration 51.8µg/g) were also the dominant estrogens in SPM. In addition, the highest total compounds concentrations were found in December in both phases, which could be due to the low flow conditions and temperature during this season. Meanwhile, a significant positive correlation was found between the total compounds concentrations in the water phase and those in SPM phase. Risk assessment based on the calculated risk quotients (RQ) showed that low and moderate risk for the aquatic environment from presence of the target compounds at all sampling points with exception of 4-TBP and NP which might pose a high risk to aquatic organisms.


Assuntos
Disruptores Endócrinos/análise , Material Particulado/análise , Rios/química , Poluentes Químicos da Água/análise , Organismos Aquáticos , Compostos Benzidrílicos/análise , China , Monitoramento Ambiental , Estrogênios/análise , Fenóis/análise , Medição de Risco
8.
Huan Jing Ke Xue ; 30(9): 2527-31, 2009 Sep 15.
Artigo em Chinês | MEDLINE | ID: mdl-19927798

RESUMO

Aerobic biodegradation has been identified as the main attenuation mechanism for microcystin, but the role of anaerobic microcystin biodegradation remains unclear. To elucidate this process, we assessed the potential for anaerobic microcystin LR biodegradation by sediment microbial community from Dianchi Lake and evaluated the effects of environmental factors and additional nutrient sources on the rates of anaerobic biodegradation. The results showed that microcystin LR was rapidly degraded from 5 mg/L to below detection limit within 2 days, demonstrating that the indigenous microorganisms can efficiently degrade microcystin LR under anaerobic conditions and can use microcystin LR as a sole nitrogen source. The rates of anaerobic microcystin LR biodegradation increased with increasing incubation temperature within the experimental range of 15-30 degrees C. Anaerobic microcystin LR biodegradation was slower (pH = 5.0) or even ceased (pH = 3.0) at acidic pH, but there was no difference in the rates at neutral (pH = 7.0) and alkaline (pH 9.0, 11.0) conditions. The addition of glucose decreased pH of the culture by producing acidic compounds and therefore significantly inhibited the anaerobic biodegradation of microcystin LR, but with the addition of NO3-, this inhibition disappeared. NO3- amendment also retarded the biodegradation of microcystin LR, demonstrating that NO3- was not used as a terminal electron acceptor. These findings suggest that anaerobic biodegradation might be another main attenuation mechanism for microcystin LR in sediments and present a significant bioremediation potential.


Assuntos
Anaerobiose , Sedimentos Geológicos/microbiologia , Microcistinas/metabolismo , Microbiologia da Água , Poluentes da Água/análise , Bactérias/metabolismo , Biodegradação Ambiental , China , Água Doce/análise
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA