The measurement of gaseous fluoride in the aluminium industry

The introduction of Integrated Pollution control (IPC) by means of the Environmental Protection Act (EPA 90)., has brought with it regulatory requirements for operators of industrial processes if. the UK to undertake continuous monitoring of gaseous atmospheric releases. In response to these changes Anglesey Aluminium Metal Limited (AAM) has chosen to install Tunable Diode Laser Spectroscopy (TDLAS) as the continuous HF monitoring system. This method, operating in the Near Infra Red region (NIR), is gaining increased acceptance as the choice for trace gas measurement where sensitivity, specificity, and fast response are required. This paper focuses on this change to the gaseous fluoride monitoring activities at AAM with particular attention to stack monitoring.