GC-IRMS/SIRA mass-spectrometry of stable carbon isotopes ¹³С/¹²С in volatile organic compounds The article presents the results of applications of the new developed mass-spectrometric GC-IRMS/ SIRA method for the evaluation of stable carbon isotopes 13C/12C ratios in volatile organic compounds on the example of ethanol from wines and other alcohol containiproducts. The traditional mass-spectrometric EA-IRMS/SIRA method requires a proper distillation step for the extraction and purification of ethanol with its subsequent oxidation-reduction transformation by using the element analyzer. The developed GC-IRMS/SIRA method has a number of advantages, which include, first of all, high selectivity, speed and reliability of stable isotope ratios determinations. The approbation of the developed method was carried out on a number of wine products, incl. red and white wines, bulk wines, brandies, spirits, cognacs, etc. The δ13CVPDBvalues in ethanol of grape origin were ranging from –28.15 to –25.67 ‰ (red & white wines/bulk wines) and –27.83 to –24.48 ‰ in studied samples (alcohol distillates/spirits/cognacs/brandies). The publication has been prepared with the support of the RUDN University Program 5-100.
The NMR method and the soviet Atomic project As part of the implementation of the Soviet Atomic Project, NMR work since 1950 was carried out at the Sukhumi Physicotechnical Institute (SPTI), first using the NMR method in molecular beams. The initiator of the use of NMR in solutions appeared to be V.V. Migulin, who headed the SPTI in 1950. In 1952, the All-Union Conference on Radiospectroscopy and Measurement of the Magnetic Moments of Nuclei took place in the SPTI. The most notable report was the work by N.I. Leontyev, the future director of the SPTI. The NMR method in solutions was used to measure magnetic fields and determine the content of isotopes in chemical compounds. An important role in the work on NMR was played by the consultations of German specialists who took part from 1945 to 1955 in works on the uranium problem.
The concept of the new version of ISO / IEC 17025:2017 New edition of ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories was published on November 30th 2017. This document has become the international reference for laboratories carrying out calibration and testing activities around the world – says ISO web-site. This article gives the overview of the main changes in new edition.
Features of normative documents of the Russian Federation and the EU on the assessment of water supply and sanitation quality A comparative analysis of international and Russian standards for the control of wastewater treatment and bathing water quality. The quantitative criteria of quality of water supply and sanitation services, as well as indicators of its efficiency are discussed. The complexes of standards that require utilities to create a management system that ensures safety, reliability and stability of their work are described. Examples of risk management and crisis management documents are given, for the implementation of which vulnerability and risk assessments are necessary, taking into account the identified threats.
New edition of ISO/IEC 17025:2017. What changed? On November 30, 2017, a new edition of the ISO / IEC 17025 standard appeared, replacing the 2005 version (GOST ISO / IEC 17025-2009 General requirements for the competence of testing and calibration laboratories). Resolutions adopted by ILAC (Resolution GA 20.15) and EA (Resolution 2016 (38) 23) establish that the transition period for implementation of the updated standard is three years from the date of its publication. Therefore, accredited laboratories and those that are just preparing for this process must take into account new requirements. Since in Russia a new version of the standard has not yet been adopted, the official text is not published in Russian, the authors conducted a comparative analysis of the contents of documents in 2005 and 2017 in the English version.