Tianjin Environment Monitoring Center
Tianjin Environment Monitoring Center
Yang Z.-W.,Nankai University |
Wu L.,Nankai University |
Yuan J.,Tianjin Environment Monitoring Center |
Li F.-H.,Nankai University |
And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2017
In order to investigate the impacts of fireworks on air quality in Tianjin city, ambient concentrations of gaseous pollutants (SO2, O3, NO, NO2), particulate matters (PM1.0, PM2.5, PM10) and fractions (water-soluble ions, organic carbon, elemental carbon) were monitored online at the station of Tianjin Environment Monitoring Centre, during the Spring Festival in 2015. The ambient concentrations of gaseous pollutants, particulate matter, and chemical species of PM2.5 were compared between the fireworks and non-fireworks periods. The concentrations of PM1.0, PM2.5, PM10 and SO2 were heavily affected by fireworks, the concentrations of which were 284.00 μg/m3, 428.00 μg/m3, 714.00 μg/m3 and 283.14 μg/m3 respectively during the heavy-firework period, and among the setting off period, the mean concentrations of which were increased by 2.99, 2.54, 2.07 and 3.27 times higher than non-discharge periods. Fireworks had great influence on the water soluble ionic in PM2.5, especially on the potassium, chloride, sulfate, magnesium, nitrite and sodium ions, which accounted for 35.28% of the PM2.5 mass concentration during the peak period. At that time, the concentrations of OC and EC were 15.68 μg/m3 and 2.96 μg/m3 respectively, which were 2.0 and 1.4 times of the mean concentration of the previous hour. © 2017, Editorial Board of China Environmental Science. All right reserved.
Zhao M.-Z.,Tianjin Environment Monitoring Center |
Zou L.-L.,CAS Dalian Institute of Chemical Physics |
Gao Y.,CAS Dalian Institute of Chemical Physics |
Xu L.,Tianjin Environment Monitoring Center
Xiandai Huagong/Modern Chemical Industry | Year: 2017
Persistent organic pollutants (POPs) are the most important class of organic pollutants and attract the worldwide attentions. Short-chain chlorinated paraffins (SCCPs) have become a new candidate in the list of POPs due to their persistence, bioaccumulation, long-range transportation and toxicity. In this study, the pollution characteristics of SCCPs are analyzed. The current production, utilization and pollution situation of SCCPs in China are investigated. The management and pollution control of SCCPs at home and abroad are summarized as well. © 2017, China National Chemical Information Center. All right reserved.
Cai H.,Mudanjiang Teachers College |
Bian S.,Tianjin Environment Monitoring Center
Acta Theriologica Sinica | Year: 2015
Rodents were trapped using snap traps from 2011 to 2013 at 31 sites in six habitats in the Tianjin Palecoast and Wetland Natural Reserve (TPWNR)and ten environmental variables were recorded for each site. In total, 157 individuals were captured comprising 7 species. The total trap capture success rate was 1.69%. There were three dominant rodents: Apodemus agrarius, Rattus norvegicus, and Cricetulus triton, for which trap capture successes were 0.59%, 0.25%, and 0.23%, respectively. The trap capture success rates, species richness, Shannon and Pielou index were significantly difference among the six habitats. The highest trap capture successes were found in areas with human habitation and cropland, followed by water's edge; the remaining habitats were low. The highest values for both species richness and Shannon index were found in human inhabited areas and cropland, and the lowest value were found in alkali area habitat. The Pielou index was high in different habitats except of the water's edge habitat. These results indicate that there was significant variation among the rodent communities in TPWNR. Such variations were controlled by environmental factors. The result of redundancy analysis with forward selection indicated that distance to crops, herbaceous coverage, water salinity and shrub height played key roles in defining the structures of rodent communities in TPWNR. ©, 2015, Science Press. All right reserved.
Tian Y.,Nankai University |
Xiao Z.,Tianjin Environment Monitoring Center |
Wang H.,Nankai University |
Peng X.,Nankai University |
And 6 more authors.
Atmospheric Environment | Year: 2017
When planning short-term and long-term measurement campaigns of particulate matter (PM), parameters such as sampling period, time resolution, sampling number, etc. are vital. To study their influence and to provide suggestion for the sampling plan of PM source apportionment (SA), ambient and synthetic speciated datasets (including a high time-resolution dataset and a long-term daily dataset) were studied. First, aiming at studying the sampling period required to generate representative and reliable results for SA, high time-resolution ambient samples were collected by online instruments in a megacity in China. Datasets with different sampling periods (four months, two months, one month, two weeks and one week) were modeled by the Positive Matrix Factorization (PMF). Compared with four month results, AAEs (percent absolute errors between true and estimated contributions) ranged from 11.2 to 27.2% (two months), 19.8–44.5% (one month), 21.0–45.9% (two weeks) and 23.9–44.6% (one week), indicating that divergence increased with decreasing sampling periods. To systematically evaluate this problem and investigate if the increasing time resolutions in a short period could enhance the modeling performance, synthetic datasets were constructed. Results revealed that a sufficient sampling period is required to ensure stable results; without sufficient sampling period, the contributions cannot be reliably estimated, even if the number of samples is large. Then, to explore the influence of variability absences, long-term daily datasets with various variability absences were apportioned and compared. The summed AAEs were 102.2% (no winter), 73.6% (no weekend), 138.7% (no weekday) and 165.6% (no autumn, winter or weekends). This general increase of AAEs can indicate that uncertainty enhanced with the increase in variability absences. When planning short-term measurement campaigns, except for number of samples, sampling period that involves sufficient source cycles has significant implications; when planning long-term sampling, more intensive sampling would increase the model performance. © 2017
Qin K.J.,China Automotive Technology and Research Center |
Wang C.Y.,China Automotive Technology and Research Center |
Yan J.,Tianjin Environment Monitoring Center |
Liu X.H.,Tianjin Environment Monitoring Center
Advanced Materials Research | Year: 2013
Refuse truck accounted for 70% of the sanitation vehicle, which was the major heavy duty vehicle type in city. Therefore its fuel economy and emission characteristics were under higher requirements. This research did the emission test on the chassis dynamometer by using compressed truck, testing C-WTCV and CCBC circle emission, and fuel consumption respectively. The research showed the Km fuel consumption of CCBC circle was about 1.3 times of the C-WTVC from the analysis of fuel consumption and the emission of CO2.From the analysis of emission factor, the emission of NOX and CO of the CCBC circle was both higher than the C-WTVC, respectively 1.9 times and 1.4 times. However, the emission of HC was only 36% of the C-WTVC. C-WTVC was very similar to the motor of the CCBC circle in city, however the motorway cycle and emission both had significant difference from CCBC circle. © (2013) Trans Tech Publications Switzerland.
Deng B.L.,Tianjin Environment Monitoring Center |
Wang H.Z.,Tianjin Academy of Social science
Advanced Materials Research | Year: 2014
Climate change has been highlighted as an apparent and urgent issue in environmental research fields. Transport, as the third carbon emitter sector in China, is partly responsible for climate change. It is necessary to modify the existing Strategic Environmental Assessment (SEA) system for transportation planning so as to cope with the challenges of Climate Change. In this paper, we tried to integrate climate change consideration into SEA process, and proposed the framework and indicator system for SEA considering climate change. © (2014) Trans Tech Publications, Switzerland.
Sun H.,Nankai University |
Ren X.,Nankai University |
Zhao L.,Tianjin Environment Monitoring Center
Water, Air, and Soil Pollution | Year: 2014
Treated and untreated rice straw extensively exists in the soil. In order to elucidate its possible effect on the fate of organic pollutants, sorption of pyrene by rice straw and its main constituents (lignin, cellulose, and hemi-cellulose) were studied, as single solute and in the presence of other co-existing organic pollutants, phenanthrene (Phen), benzo[a]pyrene (BaP), phenol, and pentachlorophenol (PCP). Pyrene showed the greatest sorption on lignin with greater aromaticity and smaller polarity, and the sorption coefficient was almost two orders of magnitude greater than those on cellulose and hemi-cellulose. Bi-solute sorption results showed that Phen, BaP and PCP exhibited apparent competitive sorption with pyrene on the four sorbents; while the existence of phenol promoted the sorption of pyrene on rice straw and lignin but inhibited the sorption on cellulose and hemi-cellulose. For the two polycyclic aromatic hydrocarbon (PAH) co-solutes and PCP, hydrophobicity and molecular size played important roles in competition, suggesting the direct competition for hydrophobic sorption sites and pore blockage mechanisms. In contrast, the polar co-solute, phenol showed different effects on pyrene sorption onto the four sorbents, suggesting that multiple interactions between polar organic compounds and sorbents are involved in the sorption. © 2014 Springer International Publishing Switzerland.
Wang X.-J.,Tianjin University |
Gao X.,Tianjin Environment Monitoring Center |
Zhai H.-Y.,Tianjin University
Xiandai Huagong/Modern Chemical Industry | Year: 2016
Ozone has been widely adopted in water and wastewater treatment. In this study, the effects of key parameters of ozone generator on the ozone bubble size, flow rate and concentration is deeply discussed. The results show that smaller aerator aperture results in lower oxygen output pressure and flow rate, which consequently decreases the bubble size and bubble rising velocity. It is useful to improve the dissolved ozone concentration. The bubble diameter, initial rising velocity and dissolved ozone concentration can reach 1.30 mm, 0.18 m/s and (26.84±0.20) mg/L, respectively, under the following conditions: microporous aerator, an oxygen output pressure of 0.1 MPa, a flow rate of 0.5 L/min and a temperature of 7℃. © 2016, China National Chemical Information Center. All right reserved.
Ran X.,Ocean University of China |
Ran X.,State Oceanic Administration |
Yu Z.,Ocean University of China |
Yao Q.,Ocean University of China |
And 3 more authors.
Biogeochemistry | Year: 2013
A mass balance of dissolved silica (DSi) based on daily measurements at the inflow and outflow of the Three Gorges Reservoir (TGR) in 2007 and a more precise budget, with inflow, outflow, primary production, biogenic silica (BSi) settlement, dissolution of BSi in the water column and flux of DSi at the sediment-water interface in the dry season (April) of 2007 were developed. We address the following question: How much does the Three Gorges Dam (TGD) affect silica transport in the TGR of the Changjiang River (Yangtze River)? The DSi varied from 71. 1 to 141 μmol/l with an average of 108 μmol/l, and it ranged between 68. 1 and 136 μmol/l, with an average of 107 μmol/l in inflow and outflow, respectively, in the TGR in 2007. The linear relationship of DSi between inflow and outflow water is significant (r = 0. 87, n = 362, p < 0. 01). Along the main stream of the TGR, the DSi concentration decreases with an average concentration of 84. 0 μmol/l in the dry season. However, the stratification of DSi was not obvious in the main channel of the TGR in the dry season. The BSi is within the range of 0. 04-5. 00 μmol/l, with an average concentration of 2. 1 μmol/l in the main channel of the TGR, while it is much higher in Xiangxi Bay (1. 30-47. 7 μmol/l, 13. 1 μmol/l) than in the main stream of the TGR and the other bays. After the third filling of the TGR, approximately 3. 8% of the DSi was retained by the TGR based on a 12-month monitoring scheme in 2007, which would slightly reduce nutrient fluxes of the Changjiang River to the East China Sea (2%). DSi was lost during January to June and November, whereas the additions of DSi were found during the other months in 2007. The budget results also indicate that there is a slight retention of DSi. The retention of DSi in the reservoir is approximately 2. 9%, while BSi is approximately 44%. Compared with the total silica load, the retention of DSi and BSi in the reservoir is only 5. 0% in the dry season. With its present storage capacity, the reservoir does not play an important role as a silica sink in the channel of the TGR. The DSi load is significantly related to discharge both in inflow and outflow waters (p < 0. 01). DSi retention, to some extent, is the runoff change due to impoundment. © 2012 Springer Science+Business Media B.V.
Xiangbin R.,Ocean University of China |
Xiangbin R.,State Oceanic Administration |
Zhigang Y.,Ocean University of China |
Hongtao C.,Ocean University of China |
And 3 more authors.
Environmental Earth Sciences | Year: 2013
Water samples were collected from the Changjiang River (Yangtze River) in May 2005, after the impoundment of the Three Gorges Reservoir (TGR), to examine the influence of the TGR and large lakes on material delivery to the estuary of the Changjiang River. The concentrations of suspended particle material (SPM), dissolved silica (DSi) and biogenic silica (BSi) in the main stream were analyzed. The concentrations of DSi and BSi in the main channel of the Changjiang varied between 73 and 100 and 1.1-15 μmol/l, with a distance weighted average of 81 and 8.0 μmol/l, respectively. A calculation shows that live diatom comprises only an average value of 5.2 % of the BSi in the Changjiang River, and most of BSi may come from drainage basin. The concentrations of BSi and the ratios of BSi/SPM were relatively low in the Changjiang River compared to other rivers throughout the world, but the BSi carried in suspension by the Changjiang River was an important component of the rivers silicon load (i.e. ~13 %). SPM, DSi and BSi concentrations as observed in the Changjiang River tend to decrease from the upper sections of the river to the Three Gorges Dam (TGD), reflecting sedimentation associated with BSi trapping and DSi retention in the TGR in the normal-water period. SPM and BSi retention are more strongly influenced by the TGD compared to DSi. About 98 % of SPM, 72 % of BSi and 16 % of DSi were retained within the TGR in May 2005. The fluxes variations of DSi, BSi and SPM suggested that the large lakes and dams had a coupled effect on the transportation of DSi, BSi and SPM in the normal-water period. Such a change in silicon (DSi and BSi) balances of the Changjiang River will affect the ecological environment of the Changjiang estuary and its adjacent sea to some extent. © 2013 Springer-Verlag Berlin Heidelberg.