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Acid-soluble internal capsules for closed-face cassette elemental sampling and analysis of workplace air.

Authors
Harper-M; Ashley-K
Source
J Occup Environ Hyg 2013 Jun; 10(6):297-306
NIOSHTIC No.
20042416
Abstract
Airborne particles that are collected using closed-face filter cassettes (CFCs), which are used widely in the sampling of workplace aerosols, can deposit in places other than on the filter and thereby may not be included in the ensuing analysis. A technique for ensuring that internal non-filter deposits are included in the analysis is to collect airborne particles within an acid-soluble internal capsule that, following sampling, can be dissolved along with the filter for subsequent elemental analysis. An interlaboratory study (ILS) was carried out to evaluate the use of cellulosic CFC capsule inserts for their suitability in the determination of trace elements in airborne samples. The ILS was performed in accordance with an applicable ASTM International standard practice, ASTM E691, which describes statistical procedures for investigating interlaboratory precision. Performance evaluation materials consisted of prototype cellulose acetate capsules attached to mixed-cellulose ester filters. Batches of capsules were dosed with Pb-containing materials (standard aqueous solutions, and certified reference material soil and paint). Also, aerosol samples containing nine target analyte elements (As, Cd, Co, Cr, Cu, Fe, Pb, Mn, and Ni) were generated using a multiport sampler; various concentrations and sampling times were employed to yield samples fortified at desired loading levels. Triplicates of spiked capsules at three different loadings were conveyed to each volunteer laboratory; loading levels were unknown to the participants. The laboratories were asked to prepare the samples by acid dissolution and to analyze aliquots of extracted samples by atomic spectrometry in accordance with applicable ASTM International Standards. Participants were asked to report their results in units of g of each target element per sample. For the elements investigated, inter-laboratory precision and recovery estimates from the participating laboratories demonstrated the utility of the cellulosic capsule inserts for the measurement of sampled trace elements.
Keywords
Samplers; Sampling; Sampling-equipment; Sampling-methods; Filters; Filter-materials; Analytical-processes; Metals; Particulates; Particulate-sampling-methods; Aerosol-particles; Author Keywords: aerosol sampling; elemental analysis; internal capsule; occupational hygiene
Contact
Martin Harper, National Institute for Occupational Safety and Health, Health Effects Laboratory Division, 1095 Willowdale Road, Morgantown, WV 26505
CODEN
JOEHA2
CAS No.
7440-38-2; 7440-43-9; 7440-48-4; 7440-47-3; 7440-50-8; 7439-89-6; 7439-92-1; 7439-96-5; 7440-02-0
Publication Date
20130601
Document Type
Journal Article
Email Address
zzg7@cdc.gov
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20130416
Issue of Publication
6
ISSN
1545-9624
NIOSH Division
HELD; DART
Source Name
Journal of Occupational and Environmental Hygiene
State
WV; OH
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