A new certified reference material for benzene measurement in air on a sorbent tube: development and proficiency testing |
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Authors: | A Caurant B Lalère M-C Schbath C Stumpf C Sutour T Mace J-P Quisefit J-F Doussin S Vaslin-Reimann |
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Institution: | 1. Laboratoire National de Métrologie et d’Essais, 1 rue Gaston Boissier, 75724, Paris, Cedex 15, France 2. Laboratoire Inter-universitaire des Systèmes Atmosphériques, Unité Mixte de Recherche Université Paris 7, Université Paris 12 et CNRS (UMR 7583), Faculté des Sciences et Technologie, 61 avenue du Général de Gaulle, 94010, Créteil, Cedex, France
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Abstract: | A certified matrix reference material (CRM) for the measurement of benzene in ambient air has been developed at Laboratoire
National de Métrologie et d’Essais. The production of these CRMs was conducted using a gravimetric method fully traceable
to the International System of Units. The CRMs were prepared by sampling an accurate mass of a gaseous primary reference material
of benzene, using a high-precision laminar flowmeter and a mass flow controller, with a PerkinElmer sampler filled with Carbopack™
X sorbent. The relative standard deviations obtained for the preparation of a batch of 20 tubes loaded with 500 ng of benzene
were below 0.2%. Each CRM is considered independent from the others and with its own certified value and an expanded uncertainty
estimated to be within 0.5%, lower than the uncertainties of benzene CRMs already available worldwide. The stability of these
materials was also established up to 12 months. These CRMs were implemented during proficiency testing, to evaluate the analytical
performances of seven French laboratories involved in benzene air monitoring. |
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