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Your search keyword '"Zhiguo Cao"' showing total 6 results
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6 results on '"Zhiguo Cao"'

1. Mycobacteriaceae Mineralizes Micropolyethylene in Riverine Ecosystems

Author

Xiaoxu Sun, Zhenyu Chen, Tianle Kong, Zheng Chen, Yiran Dong, Max Kolton, Zhiguo Cao, Xin Zhang, Haihan Zhang, Guoqiang Liu, Pin Gao, Nie Yang, Ling Lan, Yating Xu, and Weimin Sun

Subjects
Rivers, Environmental Chemistry, General Chemistry, Carbon Dioxide, Plastics, Mycobacteriaceae, Ecosystem, Water Pollutants, Chemical, Environmental Monitoring
Abstract

Microplastic (MP) contamination is a serious global environmental problem. Plastic contamination has attracted extensive attention during the past decades. While physiochemical weathering may influence the properties of MPs, biodegradation by microorganisms could ultimately mineralize plastics into CO

Published
2022

2. Halogenated Organic Pollutant Residuals in Human Bared and Clothing-Covered Skin Areas: Source Differentiation and Comprehensive Health Risk Assessment

Author

Guifen Zhu, Wei Zou, Xiao-Jun Luo, Xi Chen, Jinghua Li, Xingli Zhang, Zhiguo Cao, Wang Neng, Chunyou Zhu, Qiaoying Chen, and Bi-Xian Mai

Subjects
Male, 010501 environmental sciences, Risk Assessment, 01 natural sciences, Clothing, Animal science, Halogenated Diphenyl Ethers, Humans, Environmental Chemistry, Ingestion, Health risk, Flame Retardants, 0105 earth and related environmental sciences, Pollutant, integumentary system, Health risk assessment, Chemistry, General Chemistry, Contamination, Polychlorinated Biphenyls, Orders of magnitude (mass), Oral ingestion, Human exposure, Environmental Pollutants, Female, Environmental Monitoring
Abstract

To comprehensively clarify human exposure to halogenated flame retardants (HFRs) and polychlorinated biphenyls (PCBs) through dermal uptake and hand-to-mouth intake, skin wipe samples from four typical skin locations from 30 volunteers were collected. The total concentration of the target chemicals (24 HFRs and 16 PCBs) ranged from 203 to 4470 ng/m2. BDE-209 and DBDPE accounted for about 37 and 40% of ∑24HFRs, respectively, and PCB-41 and PCB-110 were the dominant PCB congeners, with proportion of 24 and 10%, respectively. Although exhibiting relatively lower concentrations of contaminants than bared skin locations, clothing-covered skin areas were also detected with considerable levels of HFRs and PCBs, indicating clothing to be a potentially significant exposure source. Significant differences in HFR and PCB levels and profiles were also observed between males and females, with more lower-volatility chemicals in male-bared skin locations and more higher-volatility compounds in clothing-covered skin locations of female participants. The mean estimated whole-body dermal absorption doses of ∑8HFRs and ∑16PCBs (2.9 × 10-4 and 6.7 × 10-6 mg/kg·d) were 1-2 orders of magnitude higher than ingestion doses via hand-to-mouth contact (6.6 × 10-7 and 3.1 × 10-7 mg/kg·d). The total noncarcinogenic health risk resulted from whole-body dermal absorption and oral ingestion to ∑7HFRs and ∑16PCBs were 5.2 and 0.35, respectively.

Published
2019

3. Seasonal and Particle Size-Dependent Variations of Hexabromocyclododecanes in Settled Dust: Implications for Sampling

Author

Jinglan Feng, Adrian Covaci, Jian-hui Sun, Gang Yu, Xianfa Su, Wenchao Li, Zhiguo Cao, Fuchao Xu, and Mohai Shen

Subjects
Road dust, China, Dust sample, Dust particles, medicine, Humans, Environmental Chemistry, Particle Size, Workplace, Biology, Analytic Sample Preparation Methods, Sampling (statistics), Dust, Stereoisomerism, General Chemistry, Contamination, Seasonality, medicine.disease, Hydrocarbons, Brominated, Chemistry, 13. Climate action, Environmental chemistry, Environmental science, Environmental Pollutants, Seasons, Particle size
Abstract

Particle size is a significant parameter which determines the environmental fate and the behavior of dust particles and, implicitly, the exposure risk of humans to particle-bound contaminants. Currently, the influence of dust particle size on the occurrence and seasonal variation of hexabromocyclododecanes (HBCDs) remains unclear. While HBCDs are now restricted by the Stockholm Convention, information regarding HBCD contamination in indoor dust in China is still limited. We analyzed composite dust samples from offices (n = 22), hotels (n = 3), kindergartens (n = 2), dormitories (n = 40), and main roads (n = 10). Each composite dust sample (one per type of microenvironment) was fractionated into 9 fractions (F1-F9: 2000-900, 900-500, 500-400, 400-300, 300-200, 200-100, 100-74, 74-50, and

Published
2015

4. Distribution Patterns of Brominated, Chlorinated, and Phosphorus Flame Retardants with Particle Size in Indoor and Outdoor Dust and Implications for Human Exposure

Author

Shubo Deng, Jun Huang, Min Wu, Zhiguo Cao, Fuchao Xu, Bin Wang, Xiaoyan Wang, Haizhu Wang, Gang Yu, and Adrian Covaci

Subjects
China, 010504 meteorology & atmospheric sciences, Air pollution, Poison control, chemistry.chemical_element, 010501 environmental sciences, medicine.disease_cause, 01 natural sciences, chemistry.chemical_compound, Organophosphorus Compounds, Polybrominated diphenyl ethers, Halogenated Diphenyl Ethers, Hydrocarbons, Chlorinated, medicine, Humans, Environmental Chemistry, Polycyclic Compounds, Particle Size, Biology, Flame Retardants, 0105 earth and related environmental sciences, Air Pollutants, Inhalation Exposure, Volatilisation, Phosphorus, Environmental engineering, Dust, General Chemistry, Dechlorane plus, Chemistry, chemistry, 13. Climate action, Air Pollution, Indoor, Environmental chemistry, Housing, Particle size
Abstract

Dust samples were collected in Beijing, China, from four different indoor microenvironments (office, hotel, kindergarten, and student dormitory) and one outdoor (road dust) microenvironment. These five composite samples were fractionated into 13 sequential size fractions and an individual fraction of

Published
2014

5. Seasonal and Particle Size-Dependent Variations of Hexabromocyclododecanes in Settled Dust: Implications for Sampling.

Author

Zhiguo Cao, Fuchao Xu, Wenchao Li, Jianhui Sun, Shen, Mohai, Xianfa Su, Jinglan Feng, Gang Yu, and Covaci, Adrian

Subjects
*DUST, *PARTICLE analysis, *HEXABROMOCYCLODODECANE, *ENVIRONMENTAL risk assessment, *SUMMER
Abstract

Particle size is a significant parameter which determines the environmental fate and the behavior of dust particles and, implicitly, the exposure risk of humans to particle-bound contaminants. Currently, the influence of dust particle size on the occurrence and seasonal variation of hexabromocyclododecanes (HBCDs) remains unclear. While HBCDs are now restricted by the Stockholm Convention, information regarding HBCD contamination in indoor dust in China is still limited. We analyzed composite dust samples from offices (n = 22), hotels (n = 3), kindergartens (n = 2), dormitories (n = 40), and main roads (n = 10). Each composite dust sample (one per type of microenvironment) was fractionated into 9 fractions (F1-F9: 2000-900, 900-500, 500-400, 400-300, 300-200, 200-100, 100-74, 74-50, and <50 μm). Total HBCD concentrations ranged from 5.3 (road dust, F4) to 2580 ng g-1 (dormitory dust, F4) in the 45 size-segregated samples. The seasonality of HBCDs in indoor dust was investigated in 40 samples from two offices. A consistent seasonal trend of HBCD levels was evident with dust collected in the winter being more contaminated with HBCDs than dust from the summer. Particle size-selection strategy for dust analysis has been found to be influential on the HBCD concentrations, while overestimation or underestimation would occur with improper strategies. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Distribution Patterns of Brominated, Chlorinated, and Phosphorus Flame Retardants with Particle Size in Indoor and Outdoor Dust and Implications for Human Exposure.

Author

Zhiguo Cao, Fuchao Xu, Covaci, Adrian, Min Wu, Haizhu Wang, Gang Yu, Bin Wang, Shubo Deng, Jun Huang, and Xiaoyan Wang

Subjects
*PHYSIOLOGICAL effects of fireproofing agents, *PHYSIOLOGICAL effects of pollutants, *PHYSIOLOGICAL effects of pollution, *PHYSIOLOGICAL effects of dust, *PHYSIOLOGICAL effects of phosphorus, *ENVIRONMENTAL health, *PARTICULATE matter
Abstract

Dust samples were collected in Beijing, China, from four different indoor microenvironments (office, hotel, kindergarten, and student dormitory) and one outdoor (road dust) microenvironment. These five composite samples were fractionated into 13 sequential size fractions and an individual fraction of <50 μm for further analysis. In the fractions of <50 μm, nine phosphorus flame retardants (ΣPFRs), four novel brominated flame retardants (ΣNBFRs), and two Dechlorane Plus isomers (DPs) showed the highest concentrations in hotel dust (124·000 ng g-1), dormitory dust (14·200 ng g-1), and kindergarten dust (231 ng g-1), respectively. Nevertheless, nine polybrominated diphenyl ethers (ΣPBDEs) were the dominant flame retardants (FRs) (96% of total FRs) in road dust, with the maximum concentration of 23·700 ng g-1, higher than in any indoor dust. The FR contamination varied strongly among different types of microenvironments, leading to high human exposure to various FRs. Concentrations of FRs did not increase constantly with a particle size decrease. Fractions with a particle size around 900, 100, and 10 μm could represent peak values, while valley values were commonly detected around fractions with a particle size around 40 μm. Large differences were found between indoor dust and road dust. In road dust, FRs were mainly enriched in fractions of <50 μm. The organic content of dust, FR application, and consequent abrasion processes of FR-containing materials might be the determinants of the FR concentrations. Volatilization and abrasion were considered to be important migration pathways for FRs. DPs and BDE-209 were sought to be mainly applied in abrasion-proof materials, while most phosphorus flame retardants (PFRs) were probably added in a large proportion in materials easy to wear. [ABSTRACT FROM AUTHOR]

Published
2014
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