Determination of Trace Elements in Fluoropolymers after Microwave-Induced Combustion

Abstract

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21270354&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21270354&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/ac3029213Analytical Chemistry, 85, 1, pp. 374-380, 2012-11-21 ABSTRACT: An effective approach to the digestion of fluoropolymers for the determination of Ag, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, and Ni impurities has been developed using microwave-induced combustion (MIC) in closed quartz vessels pressurized with oxygen. Samples that were examined included the following: polytetrafluorethylene (PTFE); polytetrafluoroethylene with an additional modifier, perfluoropropylvinylether (PTFE-TFM); and fluorinated ethylene propylene (FEP). A quartz device was used as a sample holder, and the influence of the absorber solution was evaluated. Determination of trace elements was performed by inductively coupled plasma−optical emission and mass spectrometry. Neutron activation analysis (NAA) was used for validation purposes. Results were also compared to those obtained using microwave-assisted acid extraction in high-pressure closed systems. Dilute nitric acid (5 mol L −1 ), which was selected as the absorbing medium, was used to reflux the sample for 5 min after the combustion. Using these conditions, agreement for all analytes was better than 98% when compared to values determined by NAA. The residual carbon content in the digests was lower than 1%, illustrating the high efficiency of the method. Up to 8 samples could be digested within 30 min using MIC, providing a suitable throughput, taking into account the inertness of such samples. Determination of Trace Elements in Fluoropolymers after

Comparison of sample digestion techniques for the determination of trace and residual catalyst metal content in single-wall carbon nanotubes by inductively coupled plasma mass spectrometry

“…Ignition is achieved by microwave heating using ammonium nitrate solution as an aid for ignition [24]. This technique has been used for the efficient combustion/digestion of various matrices, including fluoropolymers [25], coal [26], milk powder [27], polymers [28] and other refractory materials.…”

Microwave-Induced Combustion of Coal for Further Sulfur Determination by Inductively Coupled Plasma Optical Emission Spectrometry or Ion Chromatography

“…The use of MIC as a method for digestion of organic samples has been demonstrated for many solid matrices such as petroleum coke, 29 pitch, 30 carbon nanotubes, 31 polymers, 32 food and biological materials, [33][34][35] among others. Even though MIC method can be considered simple and a general protocol can be proposed, 36 a careful optimization regarding sample mass and combustion behavior must be performed.…”

Analytical methods for the determination of halogens in bioanalytical sciences: a review

“…A few microliters of ammonium nitrate is added to the filter paper to aid combustion [58,118]. MIC has been applied for many analytes and matrices such as food [58,111,120,121], botanical samples [83,86,122,123], soil [124], and petroleum-related matrices [125][126][127][128][129][130][131]. Dilute alkaline solutions are required to ensure quantitative recoveries for halogens when using MIC and to avoid losses, especially for bromine and iodine [58,91].…”

“…Nevertheless, halogen-containing organic compounds have been largely used in many industrial applications, resulting in great public concern because many of them are toxic, persistent, and subject to bioaccumulation in food chains [7,15,17]. On the other hand, the essential nature of some halogens, such as iodine, justifies most of the research performed on these elements in biological systems [18].…”