| Evaluation of sampling methods for measuring exposure to volatile inorganic acids in workplace air. Part 2: sampling capacity and breakthrough tests for sodium carbonate-impregnated filters. | |
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MedLine Citation:
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PMID: 21966996 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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In France, the MétroPol 009 method used to measure workplace exposure to inorganic acids, such as HF, HCl, and HNO(3), consists of a closed-face cassette fitted with a prefilter to collect particles, and two sodium carbonate-impregnated filters to collect acid vapor. This method was compared with other European methods during the development of a three-part standard (ISO 21438) on the determination of inorganic acids in workplace air by ion chromatography. Results of this work, presented in a companion paper, led to a need to go deeper into the performance of the MétroPol 009 method regarding evaluation of the breakthrough of the acids, both alone and in mixtures, interference from particulate salts, the amount of sodium carbonate required to impregnate the sampling filter, the influence of sampler components, and so on. Results enabled improvements to be made to the sampling device with respect to the required amount of sodium carbonate to sample high HCl or HNO(3) concentrations (500 μL of 5% Na(2)CO(3) on each of two impregnated filters). In addition, a PVC-A filter used as a prefilter in a sampling device showed a propensity to retain HNO(3) vapor so a PTFE filter was considered more suitable for use as a prefilter. Neither the material of the sampling cassette (polystyrene or polypropylene) nor the sampling flowrate (1 L/min or 2 L/min) influenced the performance of the sampling device, as a recovery of about 100% was achieved in all experiments for HNO(3), HCl, and HF, as well as HNO(3)+HF and HNO(3)+HCl mixtures, over a wide range of concentrations. However, this work points to the possibility of interference between an acid and salts of other acids. For instance, interference can occur through interaction of HNO(3) with chloride salts: the stronger the acid, the greater the interference. Methods based on impregnated filters are reliable for quantitative recovery of inorganic volatile acids in workplace atmosphere but are valuable only in the absence of interferents. |
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Authors:
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Martine Demange; Véronique Oury; Davy Rousset |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of occupational and environmental hygiene Volume: 8 ISSN: 1545-9632 ISO Abbreviation: J Occup Environ Hyg Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-10-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101189458 Medline TA: J Occup Environ Hyg Country: England |
Other Details:
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Languages: eng Pagination: 642-51 Citation Subset: IM |
Affiliation:
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a Institut National de Recherche et de Sécurité (INRS) , Vandoeuvre-les-Nancy , France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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