ISO/TS 13278:2017 pdf download – Nanotechnologies — Determination of elemental impurities in samples of carbon nanotubes using inductively coupled plasma mass spectrometry.
3? Terms,? definitions,? symbols? and? abbreviations 3.1? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO/TS 80004-3, ISO/TS 80004-6 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at https://www.iso.org/obp 3.1.1 ICP-MS inductively coupled plasma mass spectrometry method in which a high-temperature discharge generated in flowing argon by an alternating magnetic field induced by a radio-frequency (RF) load coil that surrounds the tube carrying the gas is detected using a mass spectrometer Note 1 to entry: ICP-MS permits quantitative determinations of trace, minor and major elements in samples pertaining to almost every field of application of analytical chemistry. 3.1.2 elemental impurity element other than carbon that is present in a carbon nanotube sample Note 1 to entry: Such impurities are primarily remnants of metal catalysts used during large-scale production of CNTs.
4 Samples and reagents 4.1 General CNT samples produced by various processes typically contain impurities consisting of amorphous carbon and other elements. ICP-MS allows the determination of major, minor and trace elements, providing quantitative information important for the characterization of the purity of CNT samples. 4.2 Samples Samples shall be used that contain either SWCNTs or MWCNTs, or both. 4.3 Reagents 4.3.1 General All reagents should be prepared and stored in polytetrafluoroethylene (PTFE) containers precleaned by nitric acid and ultrapure water. Precleaned containers made from polypropylene, quartz, or other materials may also be suitable. 4.3.2 Purity of acids Ultra high purity acids (e.g. HNO 3 , trace metal or equivalent grade) shall be used for sample dissolution and preparation of calibration standards. 4.3.3 Purity of reagents Guaranteed grade chemicals (99,99 % or higher than 99,99 %) shall be used in all tests (e.g. H 2 O 2 , guaranteed reagent or equivalent grade). Certified reference materials should be used whenever available. 4.3.4 Purity of water Ultrapure water having a resistivity of at least 18 MΩ cm at 298 K (25 °C) shall be used in all tests.