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        <gco:CharacterString>At all locations the TGM measurements were made using automatic Tekran ® 2537 mercury vapour analyzers (described in detail in Poissant, 1997). The air is typically sampled at flow rates between 1.0 and 1.5 L/min (depending on location) and is passed through a Teflon filter (47 mm diameter; 0.45 µm) at the sample line inlet to remove particulate matter. Inside the analyzer, the mercury in the sample air is pre-concentrated before analysis by amalgamation on gold cartridges (5-30 minute concentration time). Mercury is removed from the gold cartridges by thermal desorption and is detected using Cold Vapour Atomic Fluorescence Spectrophotometry (CVAFS). The analyzer has two gold cartridges which allow alternating accumulation and desorption to occur simultaneously resulting in the continuous measurement of mercury in the air stream at 5-30 minute intervals. The instruments are calibrated daily using an internal mercury source and verified during routine site audits by manual injections of mercury from an external source. The data are quality controlled using the Environment Canada RDMQ (Research Data Management and Quality Control) system.</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#fra">Dans tous les sites, les mesures du mercure gazeux total sont effectuées par un analyseur automatique de vapeur de mercure Tekran® modèle 2537 (décrit en détail par Poissant, 1997). L’air est habituellement échantillonné à des débits entre 1 et 1,5 L/min (selon le site) et, pour éliminer les matières particulaires, traverse un filtre de téflon (diamètre de 47 mm; pores de 0,45 µm) à l’entrée de la conduite de prélèvement des échantillons. Dans l’analyseur, le mercure dans l’air échantillonné est préconcentré avant l’analyse, par amalgamation sur des cartouches en or (durée de concentration de 5 à 30 min.). Le mercure est retiré des cartouches en or par désorption thermique et est détecté par spectroscopie à fluorescence atomique à vapeur froide. L’analyseur possède deux cartouches en or, ainsi les opérations simultanées de recharge et de désorption permettent la mesure continue du mercure dans le flux d’air, avec un cycle de 5 à 30 minutes. Les instruments sont étalonnés chaque jour par rapport à une source de mercure interne et ils sont vérifiés lors des contrôles de routine des sites par des injections manuelles de mercure à partir d’une source externe. Les données sont soumises au contrôle de qualité du Système de gestion et de contrôle de la qualité des données de recherche (RDMQ) d’Environnement Canada.</gmd:LocalisedCharacterString>
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