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Uncertainty of ozone measurements with the primary standard reference photometer (SRP45)

By Manuel Leiva Guzmán, Consuelo Araya C., Carlos Mancilla, James E. Norris and Rodrigo Seguel

Abstract

A comparison of the ozone primary reference standard photometer serial number 45 (SRP45) against the National Institute of Standards and Technology (NIST) instruments, serial number 0 (SRP0) and 2 (SRP2), has been performed in order to establish the traceability and comparability of ozone measurements made by the Chilean atmospheric science community. A complete uncertainty budget was developed for SRP45, using a GUM approach. The results of the comparisons allow us to conclude that SRP45, SRP0 and SRP2 are comparable according to internationals criteria over an ozone mole fraction range of 0 nmol mol−1 to at least 500 nmol mol−1. The official result for the validation of SRP45 is xSRP45 ozone = [0.013 + 0.99806xSRP2 ozone] nmol mol−1 with an expanded uncertainty of 2 × (0.27)2 + (1.18 × 10−2 × xozone)2 from 0 to 500 nmol mol−1.The financial support of the Chilean Ministry of the Environment (Ministerio del Medio Ambiente, MMA), is gratefully acknowledged for the implementation of the SRP Lab in CENMA. This effort was conducted under the MMA-CENMA 2008–2010 agreement

Topics: Primary standard reference photometer
Publisher: Elsevier B.V.
Year: 2011
OAI identifier: oai:repositorio.uchile.cl:2250/119454
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