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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: Aerosol Sci Technol. 2016 Mar 16;50(5):497–506. doi: 10.1080/02786826.2016.1164828

TABLE 1.

Summary of elemental analysis of blank substrates. ND indicates not detected.

Element Polyurethane foam Nylon mesh OELcμg m−3 Mass collected at 1/10th OELdμg
μg g−1mean ± SD μg sampler−1 a LOD bμg μg g−1mean ± SD μg sampler−1 a LOD b μg
Cd 0.167 ± 0.145 0.126 0.454 ND ND ND 2 0.098
Cr ND ND ND 0.999 ± 0.866 0.154 0.554 500 24.6
Cu 0.388 ± 0.129 0.292 0.583 ND ND ND 200 9.84
Fe 1.65 ± 1.65 1.24 4.97 ND ND ND 5000 246
Mn ND ND ND 2.45 ± 0.062 0.378 0.407 20 0.984
Ni ND ND ND ND ND ND 1500 73.8
Ti 0.231 ± 0.221 0.173 0.673 812 ± 141 125 190 300 14.8
Zn 1.47 ± 1.15 1.11 3.70 0.556 ± 0.508 0.086 0.320 2000 98.4
a

Sampler represents the substrate required for the diffusion stage of the NRD sampler: foam cylinder of 25-mm diameter and 40-mm depth or eight nylon meshes.

b

LOD is three standard deviations above the mean elemental mass per blank sampler.

c

OEL for Ti is the NIOSH REL for ultrafine TiO2; OEL for other elements are ACGIH TLVs for the element or oxide of the metal.

d

Expected mass collected on NRD sampler if sampled for 8 hours at concentrations of 1/10th the OEL.