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Shichuan Tang|Relationships between number, surface area, and mass concentrations of different nanoparticles in workplaces

Date:2017-07-30Author:
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唐仕川W.jpg


  

Shichuan Tang

Professor

Director of Beijing Key Laboratory of Occupational Safety and Health


He graduated from Shanxi Medical University majoring in preventive medicine, and now works at Beijing Municipal Institute of Labor Protection. He is the expert in the occupational health experts database of State Administration of Work Safety, the expert in the 5th national work safety experts database, the adjunct professor in School of Public Health, Peking University, the master supervisor of North China Institute of Science and Technology, the vice president of Beijing Municipal Occupational Diseases Prevention Federation, the executive vice president of Zhongan Greentec (Beijing) Occupation Health Construction Engineering Design Research Institute Co., LTD., and the chief planner of this forum.

He has mainly engaged in the basic research and application basic research of occupational safety and health, especially the risk assessment and detection equipment development of nano-particles. He has been supported by the funding of Beijing New Century Talents Project, published 7 monographs and 2 translations, declared 11 patents (9 authorized), published more than 50 professional papers, of which 30+ in first author or corresponding author. In 2013, he won the Beijing Academy Award for Outstanding Scientific and Technological Achievements.


Topic of Lecture: Relationships between number, surface area, and mass concentrations of different nanoparticles in workplaces


Abstract: No consistent metric for measuring exposure to nanoparticles has yet been agreed upon internationally. This study seeks to examine the relationship between number concentration (NC), surface area concentration (SAC), and mass concentration (MC) of nanoparticles in workplaces. Real-time NC20–1000nm, SAC10–1000nm, and respirable MC100–1000nm were determined for different nanoparticles. Concentration ratio (CR, activity: background), exposure ranking (ER), and between-metric correlation coefficients (R) were used to analyze the relationships between the three metrics. The ratio of cumulative percentage by number (APN) and cumulative percentage by mass (APM) was used to analyze whether nanoparticle number is predominant, as compared with nanoparticle mass. The CRs of NC20–1000nm and SAC10–1000nm for different nanoparticles at the corresponding work sites were higher than those of respirable MC100–1000nm. The ERs of NC20–1000nm for nano-Fe2O3 and nano-Al2O3 were the same as those of SAC10–1000nm, but were inconsistent with those of respirable MC100–1000nm. The order of correlation coefficients between NC20–1000nm, SAC10–1000nm, and respirable MC100–1000nm was: RSAC and NC > RSAC and MC > RNC and MC. The ratios of APN and APM for nano-Al2O3 and grinding-wheel particles (less than 100 nm) at the same work site were 2.03 and 1.65, respectively. NC and SAC metrics are significantly distinct from MC in characterizing exposure to airborne nanoparticles. Simultaneous measurement of NC, SAC, and MC should be conducted as part of nanoparticle exposure assessment strategies and epidemiological studies.