title: [Investigation on the homogeneity and stability of quality controlling cosmetic samples containing arsenic].
abstract: OBJECTIVE
  To study the homogeneity and stability of arsenic in quality controlling cosmetic samples.
  
  
  METHODS
  Arsenic was determined by atomic fluorescence spectrophotometric method. The t-test and F-test were used to evaluate the significant difference of the within-bottle and between-bottle results with three batches. The RSDs of arsenic obtained in different time were compared with the relative expanding uncertainties to evaluate the stability.
  
  
  RESULTS
  Average and variance of within-bottle and between-bottle results of arsenic were not different significantly. The RSDs of Arsenic were less than the relative expanding uncertainties.
  
  
  CONCLUSIONS
  Quality controlling cosmetic samples containing arsenic were considered homogeneous and stable.
authors.affiliation: Institute for Environmental Hygiene and Health Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100021, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Dong
authors.forename: Yu
authors.initials: Y
authors.lastname: Song
authors.forename: Wenjia
authors.initials: W
authors.lastname: Fan
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
mesh_terms: D001151:Arsenic / Q000032:analysis*; D003358:Cosmetics / Q000032:analysis / Q000737:chemistry* / Q000592:standards; D011786:Quality Control; D013050:Spectrometry, Fluorescence / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods
chemical_list: D003358:Cosmetics; D001151:Arsenic