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Nonwoven textile for use in a nanoparticle respiratory deposition sampler.
Vosburgh DJH; Park JH; Mines LWD; Mudunkotuwa IA; Anthony TR; Peters TM
J Occup Environ Hyg 2017 May; 14(5):368-376
The nanoparticle respiratory deposition (NRD) sampler is a personal sampler that combines a cyclone, impactor, and a nylon mesh diffusion stage to measure a worker's exposure to nanoparticles. The concentration of titanium in the nylon mesh of the diffusion stage complicates the application of the NRD sampler for assessing exposures to titanium dioxide nanoparticles. This study evaluated commercially available nonwoven textiles for use as an alternative media in the diffusion stage of the NRD sampler. Three textiles were selected as containing little titanium from an initial screening of 11 textiles by field portable x-ray fluorescence (FPXRF). Further evaluation on these three textiles was conducted to determine the concentration of titanium and other metals by inductively coupled plasma - optical emission spectroscopy (ICP-OES), the number of layers required to achieve desired collection characteristics for use as the diffusion stage in the NRD sampler (i.e., the nanoparticulate matter, NPM, criterion), and the pressure drop associated with that number of layers. Only three (two composed of cotton fibers, C1 and C2; and one of viscose bamboo and cotton fibers, BC) of 11 textiles screened had titanium concentrations below the limit of detection the XRF device (0.15 ug/cm2). Multiple metals, including small amounts of titanium, were found in each of the three nonwoven textiles using ICP-OES. The number of 25-mm-diameter layers required to achieve the collection efficiency by size required for the NRD sampler was three for C1 (R2 = 0.95 with reference to the NPM criterion), two for C2 (R2 = 0.79), and three for BC (R2 = 0.87). All measured pressure drops were less than the theoretical and even the greatest pressure drop of 65.4 Pa indicated that a typical personal sampling pump could accommodate any of the three nonwoven textiles in the NRD sampler. The titanium concentration, collection efficiency, and measured pressure drops show there is a potential for nonwoven textiles to be used as the diffusion stage of the NRD sampler.
Nanoparticles; Samplers; Workers; Work environment; Measurement equipment; Exposure levels; Risk factors; Titanium; Titanium dioxide; Textiles; X-rays; Metal dusts; Metal compounds; Metallic compounds; Metallic dusts; Author Keywords: Diffusion; nanoparticle; nonwoven; textile; sampler
Donna J.H. Vosburgh, Department of Occupational and Environmental Safety and Health, University of Wisconsin-Whitewater, 800 W. Main Street, Whitewater, WI 53190
Issue of Publication
Journal of Occupational and Environmental Hygiene
WI; IN; IA
University of Iowa, Iowa City
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division