Liu C.,CAS Research Center for Eco Environmental Sciences |
Zhang X.,East China Institute of Technology |
Xiao S.,East China Institute of Technology |
Jia B.,East China Institute of Technology |
And 6 more authors.
Talanta | Year: 2012
A sensitive approach, based on semi-quantitative measurement of the characteristic fragments in multi-stage extractive electrospray ionization mass spectrometry (EESI-MSn), was developed for fast detection of trace levels of lead in aqueous liquids including mineral water, lake water, tap water, energy drinks, soft drinks, beer, orange juice, and tea. A disodium ethylene-diamine-tetraacetic acid (EDTA) aqueous solution was electrosprayed to produce negatively charged primary ions which then intersected the neutral sample plume to generate anions of EDTA-Pb(II) complexes. The charged EDTA-Pb(II) complexes were characterized with multistage collision induced dissociation (CID) experiments. The limit of detection (LOD) using EESI-MS 3 was estimated to be at the level of 10-13 g/mL for directly detecting lead in many of these samples. The linear dynamic range was higher than 2 orders of magnitude. A single sample analysis could be completed within 2 min with reasonable semi-quantitative performance, e.g., relative standard deviations (RSDs) for deionized water were 4.6-7.6% during 5 experimental runs (each of them had 10 repeated measurements). Coca-cola and Huiyuan orange juice, representative beverage samples with complex matrices, generated recovery rates of 91.5% and 129%, respectively. Our experimental data demonstrated that EESI-MS is a useful tool for the fast detection of lead in various solutions, and EESI-MS showed promises for fast screening of lead-contaminated aqueous liquid samples. © 2012 Elsevier B.V. All rights reserved. Source
Tong Y.,Peking University |
Zhang W.,Renmin University of China |
Chen C.,Peking University |
Chen L.,Peking University |
And 7 more authors.
Environmental Pollution | Year: 2014
The fate and transfer of mercury in urban river is an important environmental concern. In this study, QWASI (Quantitative Water-Air-Sediment Interaction) model was selected to estimate the levels of total mercury and three mercury species in water and sediment, and was used to quantify the fluxes of mercury at water/air and sediment/water interfaces of an urban river. The predicted mercury levels in water and sediments were closed to the measured values. Water inflow, re-suspension of sediment and diffusion from sediment to water are major input sources of mercury in water. The net mercury transfer flux from water to air was 0.16 ng/(m2 h). At the sediment/water interface, a net total mercury transfer of 1.32 ng/(m2 h) from water to sediment was seen. In addition to the existing dynamic flux chambers measurement, this model method could provide a new perspective to identify the distribution and transfer of mercury in the urban river. © 2013 Elsevier Ltd. All rights reserved. Source
Yu Y.,Peking University |
Yu Y.,Beijing Normal University |
Wang B.,Peking University |
Wang X.,Peking University |
And 9 more authors.
Environmental Pollution | Year: 2013
Placenta and umbilical cord blood are important media for investigating maternal-fetal exposure to environmental pollutants. Historically hexachlorocyclohexanes (HCHs) were once widely-used in China. In this study, residues of HCHs were measured in placenta and umbilical cord blood samples for 40 women from Beijing. The measured median values of HCHs were 62.0 and 68.8 ng/g fat in placenta and umbilical cord blood, respectively. Concentrations of HCHs in placenta and umbilical cord blood of urban cohort were higher than those of rural group due to enhanced consumption of fish, meat, and milk. Residues of HCHs in placenta were significantly correlated with total food consumption, dietary intake, and maternal age, and could be predicted using the parameters dependent upon ingestion of meat and milk. The transplacental exposure of fetuses to HCHs was revealed by a close association between the residual levels in the paired placenta and the paired umbilical cord blood samples. © 2013 Elsevier Ltd. All rights reserved. Source
Li Q.,CAS Wuhan Institute of Rock and Soil Mechanics |
Zhang J.-T.,Administrative Center for Chinas Agenda 21 21 |
Jia L.,Administrative Center for Chinas Agenda 21 21 |
Chen Z.-A.,CAS Wuhan Institute of Rock and Soil Mechanics |
And 6 more authors.
Energy Procedia | Year: 2014
A technology roadmap is the document that is generated by the technology road-mapping process. It usually identifies the critical system requirements, the product and process performance targets, and the technology alternatives and milestones for meeting those targets. In effect, a technology roadmap identifies alternate technology "roads" for meeting certain performance objectives. CCUS has great potential to reduce CO2 emissions substantially from the whole lifecycle of traditional energy-intensive industry at a large-scale. In this paper, we do not want to address how to generally make a CO2 technology roadmap. We are concerning about the gaps and suggestions which should be closed in the coming revision of China CO2 technology roadmap 2011. The paper presents a summary of latest situations of international and national CCUS technical roadmaps. Then, the challenges existed in the past and also emerged currently in China are proposed. Finally, some comments and suggestions for the coming version of China's CCUS technology roadmap are displayed to guide ongoing development of CCUS in China based on the development situation and challenges of China CCUS RD&D in the past and at the present stage. © 2014 The Authors. Published by Elsevier Ltd. Source
Wang W.,Peking University |
Wang W.,Administrative Center for Chinas Agenda 21 21 |
Massey Simonich S.L.,Oregon State University |
Giri B.,Oregon State University |
And 8 more authors.
Environmental Pollution | Year: 2011
Bulk deposition samples were collected in remote, rural village and urban areas of Beijing-Tianjin region, North China in spring, summer, fall and winter from 2007 to 2008. The annually averaged PAHs concentration and deposition flux were 11.81 ± 4.61 μg/g and 5.2 ± 3.89 μg/m2/day respectively. PHE and FLA had the highest deposition flux, accounting for 35.3% and 20.7% of total deposition flux, respectively. More exposure risk from deposition existed in the fall for the local inhabitants. In addition, the PAHs deposition flux in rural villages (3.91 μg/m2/day) and urban areas (8.28 μg/m2/day) was 3.8 and 9.1 times higher than in background area (0.82 μg/m2/day), respectively. This spatial variation of deposition fluxes of PAHs was related to the PAHs emission sources, local population density and air concentration of PAHs, and the PAHs emission sources alone can explain 36%, 49%, 21% and 30% of the spatial variation in spring, summer, fall and winter, respectively. © 2010 Elsevier Ltd. All rights reserved. Source