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588 results on '"Ma, Wan‐Li"'

31. A Double-Blind Randomized Placebo-Controlled Phase 3 Trial of Tobramycin Inhalation Solution in Adults With Bronchiectasis With Pseudomonas aeruginosa Infection

Author

Guan, Wei-jie, Xu, Jin-fu, Luo, Hong, Xu, Xing-xiang, Song, Yuan-lin, Ma, Wan-li, Liang, Zong-an, Liu, Xue-dong, Zhang, Guo-jun, Zhang, Xiao-ju, Li, Rong-kai, Zhu, Shu-yang, Zhang, Yi-jie, Cai, Xing-jun, Wei, Li-ping, Tian, Dong-bo, Zhao, Hui, Chen, Ping-yan, Qu, Jie-ming, and Zhong, Nan-shan

Published
2023
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38. Phthalate Acid Esters (PAEs) in Indoor Dust from Decoration Material Stores: Occurrence, Sources, and Health Risks.

Author

Chen, Li-Bo, Gao, Chong-Jing, Zhang, Ying, Shen, Hao-Yang, Lu, Xin-Yu, Huang, Cenyan, Dai, Xiaorong, Ye, Jien, Jia, Xiaoyu, Wu, Kun, Yang, Guojing, Xiao, Hang, and Ma, Wan-Li

Subjects
STORE decoration, DUST ingestion, PHTHALATE esters, WALL coverings, PRINCIPAL components analysis
Abstract

Phthalate acid esters (PAEs) are one of the most widely used plasticizers globally, extensively employed in various decoration materials. However, studies on the impact of these materials on indoor environmental PAE pollution and their effects on human health are limited. In this study, forty dust samples were collected from four types of stores specializing in decoration materials (flooring, furniture boards, wall coverings, and household articles). The levels, sources, exposure doses, and potential health risks of PAEs in dust from decoration material stores were assessed. The total concentrations of Σ9PAE (the sum of nine PAEs) in dust from all decoration-material stores ranged from 46,100 ng/g to 695,000 ng/g, with a median concentration of 146,000 ng/g. DMP, DEP, DBP, and DEHP were identified as the predominant components. Among all stores, furniture board stores exhibited the highest Σ9PAE (159,000 ng/g, median value), while flooring stores exhibited the lowest (95,300 ng/g). Principal component analysis (PCA) showed that decoration materials are important sources of PAEs in the indoor environment. The estimated daily intakes of PAEs through non-dietary dust ingestion and dermal-absorption pathways among staff in various decoration-material stores were 60.0 and 0.470 ng/kg-bw/day (flooring stores), 113 and 0.780 ng/kg-bw/day (furniture board stores), 102 and 0.510 ng/kg-bw/day (wall covering stores), and 114 and 0.710 ng/kg-bw/day (household article stores). Particularly, staff in wall-covering and furniture-board stores exhibited relatively higher exposure doses of DEHP. Risk assessment indicated that although certain PAEs posed potential health risks, the exposure levels for staff in decoration material stores were within acceptable limits. However, staff in wall covering stores exhibited relatively higher risks, necessitating targeted risk-management strategies. This study provides new insights into understanding the risk associated with PAEs in indoor environments. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Global intercomparison of polyurethane foam passive air samplers evaluating sources of variability in SVOC measurements

Author

Melymuk, Lisa, Nizzetto, Pernilla Bohlin, Harner, Tom, White, Kevin B., Wang, Xianyu, Tominaga, Maria Yumiko, He, Jun, Li, Jun, Ma, Jianmin, Ma, Wan-Li, Aristizábal, Beatriz H., Dreyer, Annekatrin, Jiménez, Begoña, Muñoz-Arnanz, Juan, Odabasi, Mustafa, Dumanoglu, Yetkin, Yaman, Baris, Graf, Carola, Sweetman, Andrew, and Klánová, Jana

Published
2021
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48. The impact of gaseous degradation on the gas–particle partitioning of methylated polycyclic aromatic hydrocarbons.

Author

Zhu, Fu-Jie, Zhang, Zi-Feng, Liu, Li-Yan, Yang, Pu-Fei, Hu, Peng-Tuan, Ren, Geng-Bo, Qin, Meng, and Ma, Wan-Li

Subjects
POLYCYCLIC aromatic hydrocarbons, MONTE Carlo method, SEMIVOLATILE organic compounds
Abstract

The partitioning of semi-volatile organic compounds (SVOCs) between gas and particle phases plays a crucial role in their long-range transport and health risk assessment. However, the accurate prediction of the gas–particle (G–P) partitioning quotient (KP′) remains a challenge, especially for the light-molecular-weight (LMW) SVOCs due to their upward deviation from equilibrium state. In this study, the phenomenon with the influence of gaseous degradation on G–P partitioning was observed. Based on the diurnal study of concentrations and KP′ values for methylated polycyclic aromatic hydrocarbons (Me-PAHs), it was found that the KP′ values of methylated naphthalenes (Me-Naps; one type of LMW SVOC) during the daytime were higher than during the nighttime, and the regression lines of log KP′ versus log KOA (octanol–air partitioning coefficient) for daytime and nighttime were non-overlapping, which were different from other Me-PAHs. Compared with other diurnal influencing factors, the higher gaseous degradation of Me-Naps in the daytime than in the nighttime should partially explain their special diurnal variation in KP′ , which provided a new explanation for the non-equilibrium behavior of KP′ for LMW SVOCs. Moreover, the influence of gaseous degradation on the deviation of KP′ from equilibrium state was deeply studied based on the steady-state G–P partitioning model considering particulate proportion in emission (ϕ0). The increasing times of KP′ influenced by the gaseous degradation deviated from equilibrium state can be calculated by 1 + 13.2 ϕ0 × kdeg (kdeg , gaseous degradation rate). The increase in KP′ along with the increase in kdeg proved that higher gaseous degradation in the daytime could increase the KP′ value. Furthermore, an amplification in KP′ ranging from 1.11 to 5.58 times (90 % confidence interval: 1.01 to 14.4) under different ϕ0 values (0 to 1) in the temperature range of - 50 to 50 °C was estimated by the Monte Carlo analysis. In summary, it can be concluded that the influence of gaseous degradation should also be considered in the G–P partitioning models of SVOCs, especially for the LMW SVOCs, which provided new insights into the related fields. [ABSTRACT FROM AUTHOR]

Published
2024
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