Based on the monitoring data of five pollutants in 168 key cities under air pollution prevention and control in China from 2015 to 2020, using the MAKESENS model and the aggregate risk index(ARI), this study quantitatively analyzed the spatial and temporal distribution characteristics of air pollution and health risks in China and the six urban agglomerations. The results showed that:① PM pollution was the most serious pollution in Chinese key cities. Only 15% of the cities' six-year average concentrations of PM reached the National Secondary Standard, followed by that of NO; 77% of the cities' six-year average concentrations of NO reached the National Secondary Standard.
View Article and Find Full Text PDFThe concentration of surface ozone (O) in China increased consistently from 2015 to 2018, and became an important air pollutant, followed by particulate matter. This study uses real-time O and meteorological data, obtained in 337 cities in China during the warm seasons (April to September) of 2015 to 2018, to determine the spatial variation of surface O and its meteorological driving factors in major cities in China, via trend analysis, spatial autocorrelation, hotspot analysis, and multi-scale geographically weighted regression (MGWR) modeling. The results show that: ① during the warm season, O concentrations showed a significant growth trend (<0.
View Article and Find Full Text PDFTo study the pollution characteristics and exposure health risk of perfluoroalkyl substances (PFASs) in road dust, 12 PFASs were analyzed by ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) in this study. PFAS concentrations in road dust ranged from 0.95 to 111 ng·g, with an average concentration of (25.
View Article and Find Full Text PDFPM samples were collected at the southwest suburb of Chengdu in spring (in May 2012 and 2014). The mass concentrations of PM were determined by the weight method, and 24 chemical elements in PM were analyzed by XRF. To study the pollution characteristics and sources of chemical elements, and the potential ecological risk of heavy metals in PM, the Geo-accumulation Index, Enrichment Factor, and Potential Ecological Risk Index methods were applied, respectively.
View Article and Find Full Text PDFIn order to understand the characteristics of PM₂.₅ pollution in the atmosphere of Chengdu southwest suburb, PM₂.₅ particles in Chengdu southwest suburb were collected and analyzed from March 18 to March 31st, 2015.
View Article and Find Full Text PDFOrganic phosphorus esters ( OPEs ) in atmospheric PM2.5 in Chengdu city was quantitatively determined by using gas chromatography-mass spectrometry. The distribution characteristic was discussed, back trajectory model and correlation analysis were used to study the sources of OPEs in PM2.
View Article and Find Full Text PDFTo characterize the primary PM2.5 emission from coal-fired power plants in China, and to quantitatively evaluate the effects of flue gas denitrification and desulfurization on PM2.5 emission, a pulverized coal fired (PC) power plant and a circulating fluidized bed (CFB) plant were selected for measuring the mass concentration and water-soluble ion composition of PM2.
View Article and Find Full Text PDFCurrently, China suffers from serious pollution of fine particulate matter (PM2.5). Coal-fired power plant is one of the most important sources of PM2.
View Article and Find Full Text PDFTo study the effect of environmental influencing factors on soil mercury emissions, intact surface soil samples (0 to 5 cm) were collected from a Masson pine forest in Tieshanping, Choningng to conduct controlled experiments, and soil mercury emission flux was measured by dynamic flux chambers under different conditions. The results showed that the mercury emission significantly increased with the enhancement of solar radiation, air temperature, and soil water content. The mercury emissions in sunlight were 3 to 9 times higher than those in shade, but the latter condition should be more similar to the actual condition in the field.
View Article and Find Full Text PDFHuan Jing Ke Xue
September 2013
Nitrogen deposition on temperate steppe was monitored from November 2011 to October 2012 in Taipusi County, Inner Mongolia. The dry deposition of gaseous nitrogen compounds was calculated based on online-monitored atmospheric concentrations of NH3 and NO2 and dry deposition velocity simulated by CMAQ model. The wet deposition, dry deposition of particle, and throughfall deposition were also estimated by collecting rainfall, dust fall, and throughfall samples and the chemical analysis of NH4+ and NO3-concentrations.
View Article and Find Full Text PDFHuan Jing Ke Xue
November 2010
Using phenol as template, acrylamide as monomers, pentaerythritol triacrylate as crosslinking agent, azodiisobutyronitrile as initiating agent, acetomitrile as thinner, we synthesized MIPM in aquosity system with suspension polymerization, on which surface there are some holes. The adsorbance of MIPM to phenol will no longer increased after two hours, it means that it reaches the saturation which were 7.03 micromol x L(-1).
View Article and Find Full Text PDFFifty-two house dust samples were randomly collected in Guangzhou and Haikou City, to analyze the concentrations of Sigma10 PBDEs (sum of BDE 28, 47, 66, 85, 99, 100, 153, 154, 183 and 209), the PBDE composition profiles, and possible influencing factors, and estimate human exposure to PBDEs via dust ingestion for adults and toddlers. The results showed that PBDEs were found in all samples, with the Sigma10 PBDEs concentrations ranging from 544.2 ng/g to 9 654 ng/g, and with median (mean) of 2 547 (3 096) ng/g.
View Article and Find Full Text PDFBatch experiments were carried out to investigate the kinetics of adsorption of lead ions by steel slag on the basis of the external diffusion, intra-particle diffusion and adsorption reaction model (pseudo-first-order, pseudo-second-order). The results showed that the controlling step for the adsorption kinetics changed with the varying experimental parameters. When the particle size of steel slag was larger than 120 mesh, intra-particle diffusion of Pb(2+) was the controlling step, and when the initial concentration of Pb(2+) was less than 150 m gL(-1) or the shaking rate was lower than 150 rpm, external diffusion of Pb(2+) was promoted.
View Article and Find Full Text PDFGuang Pu Xue Yu Guang Pu Fen Xi
March 2005
This paper introduces the principle of designing resident program which can be used to obtain GBCUV screen pictures. First, the spectrophotometric data of refinery waste water, phenol and aniline were obtained by using GBCUV software. Second, the data mentioned above were transformed into text data with TXTSR.
View Article and Find Full Text PDFGuang Pu Xue Yu Guang Pu Fen Xi
June 2002
The arbitrary trivariate algebraic equations are formed based on the combination principle. The univariata algebraic equation of equilibrium constant kappa for dimerization system is obtained through a series of algebraic transformation, and it depends on the properties of monotonic functions whether the equation is solvable or not. If the equation is solvable, equilibrium constant of dimerization system is obtained by dichotomy and its final equilibrium constant of dimerization system is determined according to the principle of error of fitting.
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