At a recent Mcilvaine hot topic hour discussion Krag Petterson, Principal Product Engineer for Emissions Monitoring at Pall Corp., discussed the use of the Xact Multi Metals CEM as an alternative to monitoring with a PM CEM and a mercury CEM. The recently proposed National Emissions Standards for Hazardous Air Pollutants from Coal- and Oil-fired Electric Utility Steam Generating Units (Utility MACT) requires continuous monitoring of both PM (as a surrogate for non-Hg HAP metals) and mercury on coal-fired power plants. In addition, EPA has proposed individual and total non-Hg metal HAP limits as an alternative to using PM as a surrogate. The Xact 640 is a multi-metals CEM that offers the possibility of compliance monitoring of both mercury and non-mercury HAP directly with a single CEM rather than using both a mercury CEM and a PM CEM.  Previously, the Xact has been approved by the EPA for compliance monitoring on a hazardous waste incinerator and has passed a mercury RATA on a coal-fired power plant.

In terms of decisive class ifcation we now have the following options to meet the new U.S. MATS standard

Mercury:   continous mercury analyzer   or  periodic sorbent trap or   multi metals analyzer

Toxic Metals   Mass particulate  or  multi metals