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Li L.-Z.,South China Institutes of Environmental science | Hu G.-C.,South China Institutes of Environmental science | Zhang L.-J.,South China Institutes of Environmental science | Yu Y.-J.,South China Institutes of Environmental science | And 7 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2015

Household dust is important exposure routs of heavy metals for human health. In the present study, Cd, Cr, Pb, As and Hg in 102 household dusts from three villages around the mineral areas, Southwest of China were analyzed and assessed the potential ecological risk. The results indicated that the concentrations of heavy metals in household dusts from three villages were w (Pb) > w (Cr) > w (Cd) > w (As) > w (Hg). Cd, Cr, Pb, As and Hg in household dusts accumulated in different degree. Cumulative coefficients of Cd, Pb and Hg in the household dusts were higher than those of Cr and As. Cd had the highest cumulative coefficient of 226. 30, followed by Pb and Hg. The cumulative coefficients of Cr and As were less than 1. Correlation analysis indicated that significant correlation among Cd, Cr, Pb, As and Hg has been found in household dusts of village A and village B, respectively. However, there was no significant correlation among the heavy metals in household dusts of village C. According to principal component analysis, Cd, Pb and Hg contamination mainly from outdoor, including the metal smelting and mining as well as vehicle exhaust gas emissions, waste and so on. The potential ecological risk index indicated that comprehensive potential ecological hazards of heavy metals in household dusts of village A, B and C had reached a very strong level. ©, 2015, Zhongguo Huanjing Kexue/China Environmental Science. All right reserved.

Gan L.,South China Agricultural University | Xiong Y.,Sun Yat Sen University | Xiong Y.,SYSU CMU Shunde International Joint Research Institute | Dong F.,Sun Yat Sen University | And 5 more authors.
Journal of Environmental Sciences (China) | Year: 2016

Grass carp (Ctenopharyngodon idella) is one of the most important species in China. Decabromodiphenyl ethane (DBDPE) is a brominated flame retardant that has been used widely in industry, and has been observed to accumulate in the tissues of fish from South China. Evidence has shown that DBDPE is toxic to aquatic animals, but the molecular response has been unclear. MicroRNAs (miRNAs) are small noncoding and negative regulatory RNAs that are 20-24 nucleotides in length, which are involved in a wide range of biological processes. We took advantage of deep-sequencing techniques to accurately and comprehensively profile the kidney miRNA expression of grass carp after 8. weeks of oral exposure to DBDPE. After mapping sequencing data to the genome and Expressed Sequence Tags (ESTs) of grass carp, we identified 493 miRNAs in the sequenced grass carp samples, which included 51 new miRNAs. The results indicated that 5 miRNAs were significantly down-regulated and 36 miRNAs were significantly up-regulated (FDR. <. 0.001, 1.5-fold change) after DBDPE exposure. Real-time quantitative PCR (RT-qPCR) was performed on 4 miRNAs from the two samples, and the sequencing and RT-qPCR data were consistent. This study provides the first comprehensive identification of grass carp miRNAs, and the first expression analysis of grass carp miRNAs following DBDPE exposure. The results indicated that miRNAs have potential for use as biomarkers. © 2016.

Du G.-Y.,Southwest Petroleum University | Su Y.,Southwest Petroleum University | Su Y.,South China Institutes of Environmental science | Ren M.-Z.,South China Institutes of Environmental science | And 2 more authors.
Huanjing Kexue/Environmental Science | Year: 2014

High-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS) was used to measure contents of 2, 3, 7, 8-polychlorinated dibenzo-p-dioxin and furan (PCDD/F) in ambient air in Guangzhou city, and its sources were traced and tracked preliminarily. Spatial and seasonal distributions, the correlation between PCDD/F concentrations and various kinds of meteorological factors were studied with emphasis, as well as the trajectory of air mass simulated by hybrid single-particle lagrangian integrated trajectory (HYSPLIT) model of the U.S.A Air Resources Laboratory, which will provide important basic data for understanding PCDD/F pollution levels in urban regions. The results show, PCDD/F concentrations in the industrial area are higher than others, and in spring, PCDD/F TEQs are the highest. Meteorological factors, like wind direction and speed, temperature, air pressure, relative humidity, precipitation all have influence on pollution levels of atmospheric PCDD/Fs. Temperature and wind speed has a negative correlation with the concentration, but it is not obvious. By the analysis of the backward trajectory of air mass, something are obtained that the trajectory extends mainly to northwest areas in autumn, and air masses from inland migrate slowly in winter, while they arrive at Guangzhou after passing southeast coast or sea.

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