Abstract
Latest International Aluminum Institute (IAI) guideline includes various methodologies to measure total perfluorocarbon (PFC) emissions. Alcoa has continued to review those methodologies in selecting and implementing procedures that give reliable sampling and analytical techniques to measure high-voltage, low-voltage, and pot starts PFC emissions from aluminum cell operations. Canister sampling offers the simplest, cost-effective method to estimate total PFC emissions. However, it is important to investigate the sampling duration and frequency that can produce representative PFC emissions for reporting purposes. We need to evaluate if the sampling was representative of high-voltage anode effects and how variability of low-voltage emissions could affect the results. Low-voltage PFC emissions variability was measured using 24 h gas bag sampling. Alcoa has tested the canister sampling procedures and compared GC–MS with FTIR analytical techniques to standardize the methodology with the goal to share the results and learnings within the aluminum industry.KeywordsPerfluorocarbonPFCAnode effectHigh-voltage PFC emissionsLow-voltage PFC emissionsPFC emission monitoringTotal PFC emissions
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