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Supercritical fluid extraction (SFE) for determination of metalworking fluid aerosols

Brudin, Stella ; Hjalmarsson, Theres ; Ljungkvist, Goran ; Mathiasson, Lennart LU and Lillienberg, Linnea (2006) In Journal of Occupational and Environmental Hygiene 3(7). p.358-365
Abstract
A common methodology for analyzing metalworking fluid (MWF) aerosols in workplace air is based on gravimetry before and after organic solvent extraction of the MWFs from a suitable collection filter: Because MWFs have different chemical and physical properties, various mixtures of organic solvents have been used to extract the MWFs from their collection device. An alternative to organic solvents, used in the work presented in this article, is the use of a supercritical fluid. The efficiency of supercritical fluid extraction (SFE) was investigated by weighing conditioned filters before and after extraction of samples spiked with MWFs at different concentrations using the American Society for Testing and Materials method. For three common... (More)
A common methodology for analyzing metalworking fluid (MWF) aerosols in workplace air is based on gravimetry before and after organic solvent extraction of the MWFs from a suitable collection filter: Because MWFs have different chemical and physical properties, various mixtures of organic solvents have been used to extract the MWFs from their collection device. An alternative to organic solvents, used in the work presented in this article, is the use of a supercritical fluid. The efficiency of supercritical fluid extraction (SFE) was investigated by weighing conditioned filters before and after extraction of samples spiked with MWFs at different concentrations using the American Society for Testing and Materials method. For three common straight oil MWFs spiked on filters, supercritical carbon dioxide gave recoveries of 92-101% with a low standard deviation (0.2-1.9%). For semisynthetic MWFs, carbon dioxide had to be mixed with methanol to obtain recoveries above 80%. With the optimized method using 7% methanol in carbon dioxide, the 10 investigated MWFs could be extracted in 30 min with a recovery of 90-98%. The amount of MWFs spiked on the filters varied between 0.10-1.65 mg. In Sweden, the limit value for MWFs is 1 mg/m(3). Thus, our spike level is in the range of 10-200% of the limit value if sampling for 8 hours with 2 L/min. The use of SFE methodology results in small volume extracts (3 mL) with concentrations at such high levels that analysis of chemical components in the MWF can be carried out without further volume reduction. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
supercritical fluid, extraction (SFE), sampling, gravimetry, metalworking fluids (MWF)
in
Journal of Occupational and Environmental Hygiene
volume
3
issue
7
pages
358 - 365
publisher
Taylor & Francis
external identifiers
  • wos:000238960700006
  • scopus:39049195916
ISSN
1545-9632
DOI
10.1080/15459620600744279
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Analytical Chemistry (S/LTH) (011001004)
id
0fa53c0c-7d54-4bf7-b96d-2c48a752fce7 (old id 402146)
date added to LUP
2016-04-01 16:27:24
date last changed
2021-06-23 03:39:40
@article{0fa53c0c-7d54-4bf7-b96d-2c48a752fce7,
  abstract     = {A common methodology for analyzing metalworking fluid (MWF) aerosols in workplace air is based on gravimetry before and after organic solvent extraction of the MWFs from a suitable collection filter: Because MWFs have different chemical and physical properties, various mixtures of organic solvents have been used to extract the MWFs from their collection device. An alternative to organic solvents, used in the work presented in this article, is the use of a supercritical fluid. The efficiency of supercritical fluid extraction (SFE) was investigated by weighing conditioned filters before and after extraction of samples spiked with MWFs at different concentrations using the American Society for Testing and Materials method. For three common straight oil MWFs spiked on filters, supercritical carbon dioxide gave recoveries of 92-101% with a low standard deviation (0.2-1.9%). For semisynthetic MWFs, carbon dioxide had to be mixed with methanol to obtain recoveries above 80%. With the optimized method using 7% methanol in carbon dioxide, the 10 investigated MWFs could be extracted in 30 min with a recovery of 90-98%. The amount of MWFs spiked on the filters varied between 0.10-1.65 mg. In Sweden, the limit value for MWFs is 1 mg/m(3). Thus, our spike level is in the range of 10-200% of the limit value if sampling for 8 hours with 2 L/min. The use of SFE methodology results in small volume extracts (3 mL) with concentrations at such high levels that analysis of chemical components in the MWF can be carried out without further volume reduction.},
  author       = {Brudin, Stella and Hjalmarsson, Theres and Ljungkvist, Goran and Mathiasson, Lennart and Lillienberg, Linnea},
  issn         = {1545-9632},
  language     = {eng},
  number       = {7},
  pages        = {358--365},
  publisher    = {Taylor & Francis},
  series       = {Journal of Occupational and Environmental Hygiene},
  title        = {Supercritical fluid extraction (SFE) for determination of metalworking fluid aerosols},
  url          = {http://dx.doi.org/10.1080/15459620600744279},
  doi          = {10.1080/15459620600744279},
  volume       = {3},
  year         = {2006},
}