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Evaluation of perfluorinated compounds in seven wastewater treatment plants in Beijing urban areas

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Science China Chemistry 2011年第3期54卷 552-558页

作者： PAN YuanYuan SHI YaLi WANG JieMing cai yaqi State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The presence of perfluorinated compounds(PFCs)in seven major wastewater treatment plants(WWTPs)in Beijing was investigated in the current *** detected nine PFCs in all the wastewater and sludge *** acid(PFOA)is the dominant PFCs in influents and effluents,while perfluorooctane sulfonate(PFOS)is the major contaminant in *** highest PFC concentration was found in plants at Qinghe and Jiuxianqiao WWTP,while the lowest was found at Fangzhuang *** total values of PFC range from 2.88 to 176 ng/L in influents,from 5.48 to 498 ng/L in effluents,and from 1.21 to 32.0 ng/g(dry wt)in *** fact that effluents usually contain higher levels of PFCs than influents suggests that additional PFCs are produced during the wastewater treatment ***,PFOS decreases in effluents than in influents in 62%of the water *** may be due to the adsorption and removal of the sludge during the active *** carboxylates(PFCAs)were found significantly correlated with each other in the effluents,which may indicate their similar sources or the existence of their potential precursors in the wastewater or treatment *** mass flows of PFC discharges into WWTPs are 0.4–51.4 mg/day,and the mass flows of PFCs in effluents exceed those in influents by 127%.Domestic and commercial wastewaters are suggested to be the major sources of PFC pollution in WWTPs in Beijing.

关键词： perfluorinated compounds wastewater sludge mass flow

Distribution of methylsiloxanes in benthic mollusks from the Chinese Bohai Sea

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Journal of Environmental Sciences 2019年第2期31卷 199-207页

作者： Liqin Zhi Lin Xu Xudan He Chunhui Zhang yaqi cai State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of Sciences University of Chinese Academy of Sciences Environmental Protection Research Institute of Light Industry School of Chemical & Environmental Engineering China University of Mining & Technology(Beijing) Institute of Environment and Health Jianghan University

Methylsiloxanes are a class of silicone compounds that have been widely used in various industrial processes and personal care products for several decades. This study investigated the spatial distribution of three cyclic methylsiloxanes(D4–D6) and twelve linear methylsiloxanes(L5–L16) in mollusks collected from seven cities along the Bohai Sea. D4–D6(df = 71%–81%) and L8–L16(df = 32%–40%) were frequently detectable in the mollusk samples, while L5–L7 were not found in any mollusk samples. Cyclic methylsiloxanes(D4–D6) were found in mollusks with the mean concentrations of 15.7 ± 12.3 ng/g ww for D4,24.6 ± 15.8 ng/g ww for D5 and 34.0 ± 23.0 ng/g ww for D6. Among the seven sampling cities, the cyclic methylsiloxanes were predominant in mollusks, with the total cyclic methylsiloxanes(sum of D4–D6, ∑ CMS) accounting for 74.2%–80.7% of the total methylsiloxanes. ∑ CMS along the coastline demonstrated a clear gradient, with the highest concentrations in mollusks at the sampling sites located in the western part of the Bohai Sea and the lowest concentrations in mollusks from cities located in the eastern part of the Bohai Sea. The biota-sediment accumulation factors for cyclic methylsiloxanes(D4–D6) and linear methylsiloxanes(L8–L16) were estimated as 0.42 ± 0.06–0.53 ± 0.06 and0.13 ± 0.03–0.19 ± 0.05, respectively.

关键词： Methylsiloxane Mollusks Sediment Bioaccumulation

Occurrence and fate of chlorinated methylsiloxanes in surrounding aqueous systems of Shengli oilfield, China

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Journal of Environmental Sciences 2023年第3期125卷 332-339页

作者： Nannan Liu Jie Zhang Xudan He Lin Xu yaqi cai School of Environmental and Municipal Engineering Tianjin Chengjian UniversityTianjin 300384China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of SciencesBeijing 100085China Institute of Resources and Environment Beijing Academy of Science and TechnologyBeijing 100089China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 330106China University of Chinese Academy of Sciences Beijing 100049China

Mono-chlorinated products of cyclic volatile methylsiloxanes(cVMS),i.e.,Monochlormethylheptamethylcyclotetrasiloxane[D3D(CH_(2)Cl)],monochlormethylnonamethylcyclopentasiloxane[D4D(CH_(2)Cl)],and monochlormethylundemet... 详细信息

关键词： Chlorinated methylsiloxanes Oilfield Sediment Freshwater mussels Bioaccumulation

Perfluorinated compounds in milk, milk powder and yoghurt purchased from markets in China

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Chinese Science Bulletin 2010年第11期55卷 1020-1025页

作者： WANG JieMing SHI YaLi PAN YuanYuan cai yaqi State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy ofSciences Beijing 100085 China

The exposure to perfluorinated compounds (PFCs) through the diet for humans is of great concern. Among the diet, dairy products are in great demand. This paper reports the study on the levels of 9 perfluorinated acids and 2 fluorotelomer acids in milk, milk powder and yoghurt purchased from Chinese markets from 2008 to 2009. The analytes were quantitated by high performance liquid chromatography/electrospray tandem mass spectrometry (HPLC-ESI-MS/MS). In milk samples, perfluoroheptanoic acid (PFHpA) and perfluorononanoic acid (PFNA) were detected frequently, both in 68% of samples. In milk powder samples, perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA) and PFNA were the only detected PFCs and none of them was observed in more than 35% of samples. In yoghurt, PFOA was the most frequently detected compound, found in 69% of samples. None of fluorotelomer acids was observed in any samples. The mean concentrations of total PFCs were 178 pg/g (wet weight) in milk, 98 pg/g (dry weight) in milk powder and 42 pg/g in yoghurt (wet weight). It is notable that the data of this study indicate significant differences (P<0.001) among three kinds of packaging of milk in the concentration of total PFCs. A preliminary human health risk assessment of milk and dairy products consumption was conducted in this study. For adults, the mean daily intake of PFOS and total PFCs was equal to or lower than 23 and 167 pg kg-1 d-1 (body weight), respectively.

关键词：全氟化合物牛奶样品中国市场酸奶奶粉电喷雾串联质谱全氟辛酸铵高效液相色谱

Perfluorooctane sulfonate (PFOS) and other fluorochemicals in viscera and muscle of farmed pigs and chickens in Beijing,China

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Chinese Science Bulletin 2010年第31期55卷 3550-3555页

Eleven perfluorinated compounds(PFCs) were determined in tissue samples from farmed pigs and chickens(n=143) that were purchased in Beijing in March *** total PFCs mean concentration was the highest in pig liver(3.438 ng g-1 wet weight(ww)),followed by pig kidney(0.508 ng g-1(ww)),pig heart(0.167 ng g-1(ww)),chicken liver(0.098 ng g-1(ww)),chicken heart(0.050 ng g-1(ww)),pork loin(0.018 ng g-1(ww)),and chicken breast(0.012 ng g-1(ww)).Among the PFCs analyzed,perfluorooctane sulfonate(PFOS) was the predominant compound in viscera and muscle of farmed pigs and *** addition,a strong linear correlation(r = 0.932) was observed between the concentrations of PFOS and perfluoroundecanoic acid(PFUnDA) in pig *** preliminary conclusion is that there is little potential risk of exposure to PFCs via the consumption of these products in Beijing.

关键词：含氟化合物 PFOS 全氟辛烷猪内脏鸡肝北京养殖磺酸

One-pot molten salt method for constructing CdS/C_(3)N_(4) nanojunctions with highly enhanced photocatalytic performance for hydrogen evolution reaction

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Journal of Environmental Sciences 2022年第2期34卷 244-257页

作者： Weijia Zhao Hongyun Niu Yongliang Yang Hongzhou Lv Jungang Lv yaqi cai State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Institute of Environment and Health Jianghan UniversityWuhan 430056China Procuratoral Technology and Information Research Center Supreme People's ProcuratorateBeijing 100726China Institute of Environment and Health Hangzhou Institute for Advanced StudyUniversity of Chinese Academic SciencesHangzhou 310024China

The construction of heterojunction photocatalysts for efficiently utilizing solar energy has attracted considerable attention to solve the energy crisis and reduce environmental *** this study,we use the energy released from an easily-occurred exothermic chemical reaction to serve as the drive force to trigger the formation of Cd S and C_(3)N_(4) nanocomposites which are successfully fabricated with cadmium nitrate and thiourea without addition of any solvents and protection of inert gas at initial temperature,a little higher than the melting point of *** as-prepared Cd S/C_(3)N_(4) materials exhibit high efficiency for photocatalytic hydrogen evolution reaction(HER)with the HER rate as high as 15,866μmol/(g·hr)under visible light irradiation(λ>420 nm),which is 89 and 9 times those of pristine C_(3)N_(4) and Cd S,***,the apparent quantum efficiency(AQE)of Cd S/C_(3)N_(4)–1:2–200–2(Cd S/C_(3)N_(4)–1:2–200–2 means the ratio of Cd to S is 1:2 and the reaction temperature is set at 200℃ for two hours)reaches 3.25%atλ=420±15 *** irradiated for more than 24 hr,the HER efficiencies of Cd S/C_(3)N_(4) do not exhibit any *** DFT calculation suggests that the charge difference causes an internal electric field from C_(3)N_(4) pointing to Cd S,which can more effectively promote the transfer of photogenerated electrons from Cd S to C_(3)N_(4).Therefore,most HER should occur on C_(3)N_(4) surface where photogenerated electrons accumulate,which largely protects Cd S from photo-corrosion.

关键词： One-pot molten salt method Cd S/C_(3)N_(4)nanojunctions Photocatalytic hydrogen evolution reaction Anti-photo-corrosion DFT calculation

Advanced molecular-fingerprinting analysis of dissolved organic sulfur by electrospray ionization-Fourier transform ion cyclotron resonance mass spectrometry using optimal spray solvent

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Journal of Environmental Sciences 2020年第11期32卷 67-74页

作者： Dong Cao Ziyu Rao Fanglan Geng Hongyun Niu Yali Shi yaqi cai Yuehui Kang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of SciencesBeijing 100085China

Molecular level characterization of dissolved organic sulfur(DOS)by electrospray ionizationFourier transform ion cyclotron resonance mass spectrometry(ESI-FTICR MS)is necessary for further understanding of the role of DOS in the ***,ESI spray solvent,a key parameter for ion production during ESI process,was investigated for its effect on the molecular characterization of DOS by ESI-FTICR MS.100%MeOH as spray solvent was found for the first time to remarkably enhance the ionization efficiency of the majority of CHOS-molecules in NOM,which facilitated a total of 1473 CHOS-molecular formulas with one sulfur atom to be *** number of CHOS-molecular formulas obtained using 100%MeOH as spray solvent increased notably over 740 in comparison with those using 50%MeOH aqueous solution(731)or 50%ACN aqueous solution(653).Moreover,due to the enhancement of ionization efficiency of DOS during ESI processes,the tandem mass spectra of the NOM CHOS-molecules could be easily obtained using 100%MeOH as spray solvent,which were hardly obtained using 50%MeOH aqueous solution as spray *** results of the tandem mass spectra suggested the first discovery of organosulfates or sulfonic acids in Suwannee River NOM sample.A simple method based on 100%MeOH as ESI spray solvent for advanced molecular characterization of DOS by ESI-FTICR MS was proposed and applied,and the results revealed more molecular information of DOS in sea DOM samples.

关键词： Natural organic matter Fourier transform ion cyclotron resonance mass spectrometry Spray solvent Dissolved organic sulfur

Perfluoroalkyl acids(PFAAs) in urban surface water of Shijiazhuang, China: Occurrence, distribution,sources and ecological risks

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Journal of Environmental Sciences 2023年第3期125卷 185-193页

作者： Xiaotong Li Yuan Wang Chengjing Qian Zhixin Zheng Yali Shi Jiansheng Cui yaqi cai College of Environmental Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceUniversity of Chinese Academy of SciencesBeijing 100085China Nutrition&Health Research Institute COFCO CorporationBeijing 102209China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China

It is extremely important to analyze the contaminative behaviors of Perfluoroalkyl acids(PFAAs) due to their serious threats to urban environments which are closely related to humans. Current study aimed to explore the distribution, source apportionment and ecological risk assessment of PFAAs in surface water from Shijiazhuang, China. The concentrations of ΣPFAAs ranged from 19.5 to 125.9 ng/L in the investigation area. Perfluorobutanesulfonic acid(PFBS) and perfluoropentanoic acid(PFPeA) were the predominant contaminants(mean value: 14.3 ng/L and 16.6 ng/L, respectively). The distribution of PFAAs according to geospatial analysis and hierarchical clustering analysis(HCA) showed that higher levels of ΣPFAAs were detected in the southern surface water of Shijiazhuang and there was a stepwise decrease from the wet season to the dry season. Furthermore, based on source apportionment,the dominant potential sources were found to be wastewater treatment plant(WWTP) effluents and industrial discharge. The risk quotients(RQs) revealed low ecological risks of all PFAAs for aquatic organisms in Shijiazhuang surface water. Collectively, this study provided basic data for regulatory strategies for controlling PFAA pollutions in urban surface water.

关键词： Perfluoroalkyl acids Distribution Source apportionment Risk assessment Urban surface water

Selective separation of polychlorinated naphthalene (PCNs), hexabromocyclododecanes (HBCDs) and tetrabromobisphenol A (TBBPA) in soil matrices

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Chinese Science Bulletin 2013年第4期58卷 500-506页

作者： TENG Man JIN Jing FU Qiang cai yaqi CHEN JiPing WEI FuSheng Research Center for Eco-Environmental Sciences Chinese Academy of Sciences China National Environmental Monitoring Center Dalian Institute of Chemical Physics Chinese Academy of Sciences

A method for the selective separation of polychlorinated naphthalene (PCNs), hexabromocyclododecanes (HBCDs) and tetrabro-mobisphenol A (TBBPA) in complex matrices was developed. In the present study, the type of sorbents and the volume and composition of eluting solvents were investigated in detail. Under the optimal conditions, the recoveries of PCNs, HBCDs and TBBPA in different fractions were determined with liquid/gas chromatography tandem mass spectrometry (LC or GC-MS/MS), which was nearly close to 100%. To investigate the feasibility of the developed method, it was applied to isolate target compounds from spiked soil extracts. PCNs, HBCDs and TBBPA could be subsequently eluted with hexane, hexane/dichloromethane (1:1), and hexane/dichloromethane (1:3), and the recoveries of the analysts from three fractions were satisfactory (70.9%-107%) with the exception of -HBCD at low levels. The results indicated that the method exhibited good performance for the selective separation of PCNs, HBCDs and TBBPA and showed great potential in sample pretreatment in terms of alleviating influence from different class of impurities to some extent.

关键词：选择性分离四溴双酚A 矩阵A 氯化土壤四溴双酚-A 六溴环十二烷萘