检索结果-南通市图书馆

Seasonal trend of ambient pcdd/fs in Tianjin City, northern China using active sampling strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第11期24卷 1966-1971页

作者： Lei Ding Yingming Li Pu Wang Xiaomin Li Zongshan Zhao Qinghua Zhang Ting Tuan Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The spatial concentrations, seasonal trends, profiles and congener pairs of ambient polychlorinated dibenzo-p-dioxins （pcdds） and polychlorinated dibenzofurans （PCDfs） were investigated within a seasonally active sampling scheme during Jun 2008 and Jan 2009 in Tianjin City, northern China. The pcdd/F concentrations ranged 14.2-172 fg I-TEQ/m3 （average 69.3 fg I-TEQ/m3） in summer and （89.8-1.01） x 103 fg I-TEQ/m3 （average 509 fg I-TEQ/m3） in winter, respectively, except for the E-waste dismantling site where much higher values were observed （1.04 x 103 fg I-TEQ]m3 in summer and 7.123 x 103 fg I-TEQ/m3 in winter）. The results indicated a significantly seasonal trend with higher TEQ values in winter as compared with summer, which could be related to increased emission sources and seasonal variations of the atmospheric boundary layer height. 2,3,4,7,8-PeCDF was the dominant contributor to the total pcdd/F toxic equivalents, and 2,3,7,8-TCDD was detected at almost all the sampling sites in winter. Most of the similarly substituted pcdd/F congener pairs exhibited high correlations, suggesting that they might have similar environmental fate or sources. But different seasonal and spatial distributions of pcdd/F concentrations indicated that the emission sources might be intermittent.

关键词： pcdd/fs seasonal trend Tianjin high-volume air sampling

Destruction of pcdd/fs by gliding arc discharges

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第11期19卷 1404-1408页

作者： YAN Jian-hua PENG Zheng LU Sheng-yong DU Chang-ming LI Xiao-dong CHEN Tong NI Ming-jiang CEN Ke-fa State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China Environmental Science and Engineering Sun Yat-Sen University Guangzhou 510275 China

pcdd/fs have been become a serious issue because of their toxicological effects and associated adverse health implications. In this study, the gliding arc plasma was tested for treatment of polychlorinated dibenzo-p-dioxins （pcdds） and polychlorinated dibenzofurans （PCDfs）, which was synthesized from pentachlorophenol in atmospheric condition at 350℃ with or without the catalysis of CuCl2. From the experiment, we found that the destruction efficiency of pcdd/F homologues after gliding was discharge ranged from 25% to 79%. This result demonstrates that gliding arc plasma is an effective technology to decompose pcdds/fs in flue gas. A plausible degradation mechanism for pcdd/fs by gliding arc was discussed. Finally, a multistage reactor structure of gliding arc was proposed to upgrade removal efficiency for pcdd/fs.

关键词： pcdd/fs destruction gliding arc discharges, multistage reactor

Evaluation of pcdd/fs and metals emission from a circulating fluidized bed incinerator co-combusting sewage sludge with coal

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第1期25卷 231-235页

作者： Gang Zhang Jing Hai Jiang Cheng Zhiqi Cai Mingzhong Ren Sukun Zhang Jieru Zhang School of Chemistry and Chemical Engineering South China University of Technology South China Institute of Environmental Sciences Ministry of Environmental Protection

The emission characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans （pcdd/fs） and heavy metals were evaluated during co-combustion of sewage sludge with coal from a circulating fluidized bed incinerator. The stack gas, slag and fly ash samples were sampled and analyzed. The gas-cleaning system consisted of electrostatic precipitators and a semi-dry scrubber. Results showed that the stack gas and fly ash exhibited mean dioxin levels of 9.4 pg I-TEQ/Nm3 and 11.65 pg I-TEQ/g, respectively, and showed great similarities in congener profiles. By contrast, the slag presented a mean dioxin level of 0.15 pg I-TEQ/g and a remarkable difference in congener profiles compared with those of the stack gas and fly ash. Co-combusting sewage sludge with coal was able to reduce pcdd/fs emissions significantly in comparison with sewage sludge mono-combustion. The leaching levels of Hg, Pb, Cd, Ni, Cr, Cu, and As in the fly ash and slag were much lower than the limits of the environmental protection standard in China. These suggest that the co-combustion of sewage sludge and coal is an advisable treatment method from an environmental perspective.

关键词： co-combustion pcdd/fs sewage sludge heavy metals

Particle-bound pcdd/fs in the Atmosphere of an Electronic Waste Dismantling Area in China

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2011年第2期24卷 102-111页

作者： WEN Sheng GONG Yan LI JingGuang SHI TingMing ZHAO YunFeng WU YongNing National Institute for Nutrition and Food Safety Chinese Center for Disease Control and PreventionBeijing 100050 China Hubei Provincial Centre for Disease Control and Prevention Wuhan 430079Hubei China Institute of Agricultural Quality Standards & Testing Technology Hubei Academy ofAgriculture Science Wuhan 430064 Hubei China

Objective Particulate samples from the atmosphere in an electronic waste dismantling area were collected to investigate the levels and sources of polychlorinated dibenzo‐p‐dioxins and dibenzofurans （pcdd/fs）. Methods Particulate samples including total suspended particulates （TSP） and particulate matter 2.5 μm diameter （PM2.5） were collected on selected non‐rainy days in summer （Jul 10–12, 2006） and winter （Jan 11–13, 2007） from Fengjiang （FJ）, an electronic waste （e‐waste） dismantling area in eastern China, and an adjacent area Luqiao （LQ）. The samples were analyzed by isotope dilution‐high resolution gas chromatography / high resolution mass spectrometry （HRGC/HRMS）. Results In FJ, the mean pcdd/F concentrations （mean TEQ values） were 280.6 pg Nm‐3 （3.432 pg WHO‐TEQ Nm‐3） for the TSP samples and 223.3 pg Nm‐3 （3.180 pg WHO‐TEQ Nm‐3） for the PM2.5 samples. The total pcdd/F concentrations and TEQs in the PM2.5 samples were about 66.8%‐108.0% of the TSP samples, indicating that the fine particles contained higher levels of pcdd/fs than coarse particles. The pcdd/F levels in FJ were much higher than those detected in common urban areas around the world, suggesting that the study area was heavily polluted by pcdd/fs. Furthermore, the total average daily pcdd/F intake in FJ was estimated at 62.11 pg WHO‐TEQ kg‐1·day‐1 for adults and 110.11 pg WHO‐TEQ kg‐1·day‐1 for children, which greatly exceeds the WHO （1998） tolerable daily intake of 1–4 pg of WHO‐TEQ kg‐1·day‐1. Conclusion The pcdd/F homologues and congener profiles confirmed that the pcdd/fs in FJ originated from crude e‐waste recycling activities. The severe dioxin pollution present in FJ has also substantially influenced the adjacent area of LQ through atmospheric transport. Open burning of medical waste was another source of pcdd/fs identified in LQ.

关键词： pcdd/fs Particle Source E‐waste

Determination of pcdd/fs and dioxin-like PCBs in food and feed using gas chromatography-triple quadrupole mass spectrometry

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2017年第5期60卷 670-677页

作者： Huizhong Sun Pu Wang Honghua Li Yingming Li Shucheng Zheng Julius Matsiko Yanfen Hao Weiwei Zhang Dou Wang Qinghua Zhang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Environment and Health Jianghan University Wuhan 430056 China

A method was developed on a gas chromatograph coupled to a triple quadrupole mass spectrometer(GC-MS/MS) for trace level determination of polychlorinated dibenzo-p-dioxins/dibenzofurans(pcdd/fs) and dioxin-like polychlorinated biphenyls(DL-PCBs) in food and feed. The results demonstrated good sensitivity and repeatability for pcdd/fs and DL-PCBs at an extremely low level(10 pg mL^(-1) for 2,3,7,8-TCDD/F), as well as wide linear response of over 3 or 4 orders of magnitude in concentration ranges; 0.5–200 ng mL^(-1) for PeCDD/F and 0.2–2000 ng mL^(-1) for DL-PCBs. The method detection limits for pcdd/fs and DL-PCBs were in the range from 0.018–0.17 pg g^(-1) to 0.13–0.36 pg g^(-1), respectively. The performance of the GC-MS/MS for food and feed sample analysis showed high precision and accuracy compared to the high resolution gas chromatograph/high resolution mass spectrometer. The results indicated the feasibility of GC-MS/MS as a confirmatory method for the measurement of pcdd/fs and DL-PCBs in food and feed as required by European Union legislation.

关键词： pcdd/fs DL-PCBs food feed GC-MS/MS

QSAR Studies on pcdd/fs by Kernel PLS

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第5期24卷 541-545页

作者： TANG Kai-lin LI Tong-hua CHEN Kai Department of Chemistry Tongji University Shanghai 200092 P. R. China

QSPR models of pcdd/fs were generated by means of kernel partial least squares. The molecular distance-edge vector method was used as descriptors to get model I for predicting pcdd/fs retention behavior. The chlorinated positions were also used and model II was obtained. In studied cases, the predictive ability of the KPLS model is comparable or superior to those of PLS and ANN. The results indicate that KPLS can be used as an alternative powerful modeling tool for QSPR studies.

关键词： QSPR modeling Kernel partial least squares pcdd/fs

pcdd／fs in sodium pentachlorophenate（Na－PCP） and human blood， milk and sediment samples from Chinese schistosomiasis areas

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 1995年第1期7卷 52-59页

作者： Jiang Ke Chen Yudong Li Lingjun(Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

ＰＣＤＤ／Ｆｓｉｎｓｏｄｉｕｍｐｅｎｔａｃｈｌｏｒｏｐｈｅｎａｔｅ（Ｎａ－ＰＣＰ）ａｎｄｈｕｍａｎｂｌｏｏｄ，ｍｉｌｋａｎｄｓｅｄｉｍｅｎｔｓａｍｐｌｅｓｆｒｏｍＣｈｉｎｅｓｅｓｃｈｉｓｔｏｓｏｍｉａｓｉｓａｒｅａｓ... 详细信息

ＰＣＤＤ／Ｆｓｉｎｓｏｄｉｕｍｐｅｎｔａｃｈｌｏｒｏｐｈｅｎａｔｅ（Ｎａ－ＰＣＰ）ａｎｄｈｕｍａｎｂｌｏｏｄ，ｍｉｌｋａｎｄｓｅｄｉｍｅｎｔｓａｍｐｌｅｓｆｒｏｍＣｈｉｎｅｓｅｓｃｈｉｓｔｏｓｏｍｉａｓｉｓａｒｅａｓＪｉａｎｇＫｅ；ＣｈｅｎＹｕｄｏｎ...

关键词： sodium pentacuorophenate pcdd/fs molluscacde.

Polychlorinated dibenzo-p-dioxins and dibenzofurans (pcdd/fs) emissions from electric arc furnaces for steelmaking

在线全文

学校读者我要写书评

暂无评论

Emerging Contaminants 2020年第1期6卷 330-336页

作者： Qiuting Yang Lili Yang Jia Shen Yuanping Yang Minxiang Wang Xiaoyun Liu Xuejing Shen Changliang Li Jia Xu Fengfeng Li Da Li Guorui Liu Minghui Zheng Central Iron&Steel Research Institute Beijing100081China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesP.O.Box 2871Beijing100085China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhouChina

The proportion of steel produced using electric arc furnaces(EAfs)is increasing.In this study,polychlorinated dibenzo-p-dioxins and dibenzofurans(pcdd/fs)concentrations and patterns in stack gas samples from three typical EAfs in steelmaking plants were determined to allow the contributions of EAfs in steelmaking plants to pcdd/fs emissions in China to be assessed.Samples collection was accomplished by adopting the automatic isokinetic sampling technique,then the pcdd/fs congeners concentrations were analyzed qualitatively and quantitatively by isotope dilution high-resolution gas chromatography high-resolution mass spectrometry(HRGC-HRMS).The mean pcdd/fs mass concentrations in stack gases emitted during the scrap preheating phase of plants E1,E2,and E3 were 0.48,385.55,and 0.34 ng Nm^-3,respectively,and the total toxic equivalent(WHO2005-TEQ)concentrations were 0.05,33.16,and 0.03 ng Nm^-3,respectively.The pcdd/fs mass concentration in stack gases emitted during the melting phase at plant E3 was 0.12 ng Nm^-3(0.02 ng WHO2005-TEQ Nm^-3).The operational temperature of the bag filter of the preheating in the E2 EAF was as high as 230℃,which is conducive to the generation of pcdd/fs,whether the temperature in the bag filter of E1(150℃)and E3(120℃)are not.Moreover,the bag filter temperature is suggested to be best controlled to below 150℃.The emission factors(EF)for pcdd/fs released into the air during the scrap preheating phase for plants E1,E2,and E3 were 0.13,52,and 0.10 mg WHO2005-TEQ t1,respectively,and the EF for the smelting phase from plant E3 was 0.14 mg WHO2005-TEQ t1.The emission factor in E2 is 5 times higher than the highest current UNEP toolkit factor for EAfs(10 mg TEQ/tonne steel).Therefore,an update for the UNEP toolkit emission factor for a few case plants is suggested.Several congeners,including 2,3,7,8-TeCDF,1,2,3,4,6,7,8-HpCDF,and 1,2,3,4,6,7,8-Hpcdd,were dominant during the preheating phase,while 2,3,7,8-TeCDF,1,2,3,7,8-PeCDF,and 2,3,4,7,8-PeCDF were dominant during the smelting phase.The mon

关键词： Electric arc furnaces pcdd/fs Stack gas Congener profile Emission factors

应用遗传算法建立云杉针叶表面pcdd/fs光解半衰期的预测模型

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

环境科学 2005年第2期26卷 28-33页

作者：牛军峰余刚韩文亚清华大学环境科学与工程系持久性有机污染物研究中心北京100084

采用量子化学PM3算法计算pcdd/fs的量子化学参数 ,应用遗传算法 (GeneticAlgorithm ,GA)对所建模型中的变量进行筛选 ,建立了能预测吸附到云杉 [Piceaabies (L .)Karst.]针叶表面的pcdd/fs光解半衰期 (t1/2 )的定量结构性质关系(QSPR)... 详细信息

采用量子化学PM3算法计算pcdd/fs的量子化学参数 ,应用遗传算法 (GeneticAlgorithm ,GA)对所建模型中的变量进行筛选 ,建立了能预测吸附到云杉 [Piceaabies (L .)Karst.]针叶表面的pcdd/fs光解半衰期 (t1/2 )的定量结构性质关系(QSPR)模型 ,认为影响pcdd/fs光解速率的主要因素是分子最高占据轨道能 (EHOMO)、前线分子轨道能量差 (ELUMO -EHOMO)和平均极化率 (α) .随着EHOMO和α的增大 ;其lgt1/2 值增大 ,pcdd/fs的lgt1/2 值与其 (ELUMO-EHOMO)值呈抛物线关系 ,当ELUMO-EHOMO=7 .84 7时 ,lgt1/2 有最小值 ;当ELUMO-EHOMO≤ 7. 84 7时 ,lgt1/2 值随着ELUMO-EHOMO的增大而减小 ;当ELUMO-EHOMO≥ 7 .84 7时 ,lgt1/2 值随着ELUMO-EHOMO的增大而增大 .

关键词：遗传算法 pcdd/fs 定量结构-性质关系(QSPR) 量子化学参数