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distribution variations of the PBDEs in reservoir sediments were greater than the changes in hydrological period. The natural degradation of the PBDEs gradually increased from the river to the reservoir entry area and then to the central reservoir area. The reductive debromination rates varied at different brominated levels, and some BDE homologues accumulated due to their slowly continued degradation velocities. Research on abundance ratios indicated that the lower brominated BDE homologues were mainly derived from the natural degradation of decabromodiphenyl ether by stepwise reductive debromination. Approximately 70% of Nona-BDE produced by Deca-BDE degradation could rapidly be degraded to form Octa-BDE. Approximately 85% of BDE-208 was derived from the degradation of BDE-209. During the degradation process from Octa-BDE to Penta-BDE, some Octa-BDE and Hexa-BDE homologues accumulated due to relatively slower degradation velocities, and the degradation rates of Penta-BDE to Tri-BDE were above 70%.To investigate the occurrence, distribution, and potential risks of pharmaceuticals and personal care products (PPCPs) in the South costal area of China, a total of 20 PPCPs in water and aquatic organisms (fish, crab, and shellfish), obtained from 7 coastal rivers of the Chaoshan area, were determined using solid-phase extraction (SPE) and high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS). The results showed that up to 16 to 18 kinds of PPCPs could be detected in the rivers and aquatic organisms of the Chaoshan area, and the concentrations of PPCPs in the rivers and organisms ranged from 0.30-2223 ng ·L-1 to 0.143-80.3 ng ·g-1, respectively, with a high detection rate for many pollutants. Significant differences were observed in the samples of water and organisms. The total concentration of PPCPs in the rivers of the Chaoshan area was in the order of Huanggang River > Lianjiang River > Huangjiang River > Longjiang River > Luohe River > Rongjiang River > Hanjiang River, with the domiogical risks for algae in the Huanggang River and Lianjiang Rivers and for fleas in the Huangjiang River.As an important carrier of heavy metal pollutants in urban dust, green plants play an important role in the study of heavy metal pollution in the environment. To quantitatively assess the pollution degree, spatial distribution, and characteristics of dust accumulation of heavy metals in the leaves of 10 dominant green plants in Baoji City, the contents of Pb, Zn, Cu, Cr, Ni, Co, Cd, and As were determined in 156 leaf samples with a ground height of 0, 1, and 3 m in Baoji City, and the biological enrichment coefficient (BCF), pollution load index (PLI), and potential ecological risk index (RI) were calculated. The enrichment amounts of Cr, As, Ni, Pb, and Cd were the highest in the leaves of the green plants in Baoji City. The contents of Cr, Ni, and As in Ophiopogon Japonicus were the highest; the highest content of Cd was found in privet leaves, and the contents of Pb, Ni, and As in the leaves of tarasone were the highest. Clover, privet, and photinia revealed significant enrichment of Cd. The contents of Cr, As, Ni, Pb, Cd, and Zn decreased with an increase in the height of spatial distribution. Moreover, the rate of decrease in Cr was up to 24%, and the peak areas were around the Qianhe industrial zone, Renjiawan railway station, and the municipal government. According to PLI and RI values, the Renjiavan railway station and Qianhe industrial zone were moderately polluted areas with moderate ecological risk level, whereas the high-tech avenue area represented a strong ecological risk level. In addition, the PLI values of both Cr and As in the leaves of the green plants were greater than 3, indicating a level of severe pollution. Based on the average E r i values, Cd and As were the most ecologically harmful elements. The study area was at a medium risk level.Combined air pollution has become one of the most important city diseases in China. The construction of an urban forest not only needs landscape aesthetics, but also requires selecting a plant of high comprehensive tolerance threshold based on the needs of the ecological environment of each city, which has become a standard to maintain the sustainable development of the urban forest ecological function under environmental pollution. According to the comprehensive factor analysis of the sorption and absorption capacity of 537 plants to six air pollutants (i.e., sulfur dioxide, nitrogen dioxide, hydrogen fluoride, chlorine, ozone, and particulate matters), the results showed that the tree species with strong comprehensive tolerance ability to six air pollutants were Morus alba, Platycladus orientalis, and Ailanthus altissima; the tree species with medium comprehensive tolerance ability were Populus tomentosa, Acer truncatum, Sabina chinensis, Amygdalus davidiana, Salix babylonica, Paulownia fortunei, and Pinus tabulaeformis; the trees species with relatively weak comprehensive tolerance ability were Robinia pseudoacacia, Populus×canadensis, Ginkgo biloba, Juglans regia, Platanus acerifolia, Koelreuteria paniculata, Lagerstroemia indica, and Forsythia suspensa. According to the characteristics of climate, economic structure, and air pollutants of the cities in the north and south of China, the urban forest should be constructed using selected species with a strong comprehensive tolerance ability to achieve maximum purification effect of the urban forest ecological service function.In this research, the activity data of Sichuan Province were collected using bottom-up and top-down methods. According to the second survey of pollution sources, the activity data of industrial source includes information of 11020 boilers and 60078 industrial enterprises. Data of 19152 industrial enterprises were collected in Chengdu, accounting for 32% of the total number of enterprises in Sichuan Province. The anthropogenic air pollutant emission inventory of 9 km×9 km was developed for Sichuan Province in 2017 with the use of appropriate emission estimation methods. The results showed that the total emission of SO2,NO x ,CO,PM10,PM2.5,BC,OC,VOCs, and NH3 in Sichuan were 308.6×103, 725.7×103, 3131.2×103, 927.6×103, 422.4×103, 30.2×103, 72.0×103, 600.9×103, and 887.1×103 t. selleck compound The fixed combustion source and process source mainly contributed as sources of SO2. The main source of CO was the process source and mobile source. Further, the dust source and process source were the main sources of PM10 and PM2.5, and the dust source was the largest source of BC and OC contributions.
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