title: Respirable size-selective sampler for end-of-shift quartz measurement: Development and performance.
abstract: Aims of this study were to develop a respirable size-selective sampler for direct-on-filter (DoF) quartz measurement at the end-of-shift (EoS) using a portable Fourier transform infrared (FTIR) spectrometer and to determine its size-selective sampling performance. A new miniaturized sampler has been designed to have an effective particle deposition diameter close to the portable FTIR beam diameter (6 mm). The new sampler (named the EoS cyclone) was constructed using a 3D printer. The sampling efficiency of the EoS cyclone was determined using polydisperse glass sphere particles and a time-of-flight direct reading instrument. Respirable dust mass concentration and quartz absorbance levels of samples collected with the EoS cyclone were compared to those collected with the 10-mm nylon cyclone. The EoS cyclone operated at a flow rate of 1.2 l min-1showed minimum bias compared to the international standard respirable convention. The use of the EoS cyclone induced respirable dust mass concentration results similar but significantly larger (5%) than those obtained from samples collected with 10-mm nylon cyclones. The sensitivity of the DoF-FTIR analysis in estimating quartz was found increased more than 10 times when the samples were collected with the EoS cyclone. The average particle deposition diameter was 8.8 mm in 60 samples. The newly developed user friendly EoS cyclone may provide a better sampling strategy in quartz exposure assessment with faster feedback.
authors: a Exposure Assessment Branch, Health Effects Laboratory Division , National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention , Morgantown , West Virginia.
authors: Taekhee
authors: T
authors: Lee
authors: a Exposure Assessment Branch, Health Effects Laboratory Division , National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention , Morgantown , West Virginia.
authors: Larry
authors: L
authors: Lee
authors: b Dust, Ventilation and Toxic Substances Branch, Pittsburgh Mining Research Division , National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention , Pittsburgh , Pennsylvania.
authors: Emanuele
authors: E
authors: Cauda
authors: b Dust, Ventilation and Toxic Substances Branch, Pittsburgh Mining Research Division , National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention , Pittsburgh , Pennsylvania.
authors: Jon
authors: J
authors: Hummer
authors: a Exposure Assessment Branch, Health Effects Laboratory Division , National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention , Morgantown , West Virginia.
authors: Martin
authors: M
authors: Harper
mesh_terms: D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D019570:Inhalation Exposure / Q000032:analysis*; D016273:Occupational Exposure / Q000032:analysis*; D010316:Particle Size; D066330:Printing, Three-Dimensional; D011791:Quartz / Q000032:analysis*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D004391:Dust; D011791:Quartz
keywords: Cyclone; end-of-shift; quartz; respirable size-selective sampler; silica