title: [Comparison of two methods for fiber count concentration determination].
abstract: OBJECTIVE
  To compare the determination methods of fiber number concentration between China and WHO.
  
  
  METHODS
  Individual fiber samplings were conducted at a RCF manufacturing enterprise for 40 types of work. Flow rate was set as 2 L/min and lasted 2 to 4 hours. We used acetone-triacetin to prepare samples. The rules of two methods were used to count fibers for each sample respectively. The differences between the results of two methods were compared using the sign-rank test, and the correlation between the two methods' counting results were evaluated by the Spearsman rank correlation analysis.
  
  
  RESULTS
  The results of WHO counting rule were higher than those of Chinese counting rule for the same sample. The ratios of WHO method to Chinese method ranged from 1.88 to 3.70. Paired sign-rank test found the statistically significant differences of the results between the two methods (P<0.01). The rank correlation coefficient of the results by two rules counting ranged between 0.621 to 0.975, suggested positive correlation (P<0.01). The possible reasons of the difference between the two methods included the difference between the shapes of asbestos fiber and man-made mineral fiber, and counting rules of two methods.
  
  
  CONCLUSIONS
  The results of WHO counting method is higher than those of Chinese counting method. High correlations between the results of the two methods were observed.
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Luo
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Rong
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Limin
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Jintong
authors.initials: J
authors.lastname: He
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Lu
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Runbo
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Sun
authors.affiliation: Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; E-mail: wchen@mail.tjmu.edu.cn.
authors.forename: Weihong
authors.initials: W
authors.lastname: Chen
mesh_terms: D001194:Asbestos / Q000032:analysis*; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002681:China; D006801:Humans; D019016:Mineral Fibers / Q000032:analysis*; D013048:Specimen Handling; D014944:World Health Organization
chemical_list: D019016:Mineral Fibers; D001194:Asbestos