Tekran Model 1135 Particulate Mercury Unit

The Tekran Model 1135 Particulate Mercury Unit is used together with the Model 1130 Speciation Unit and the Model 2537A Mercury Analyzer to simultaneously monitor particulate bound mercury (Hg^P), elemental mercury (Hg⁰) and reactive gaseous mercury (RGM) in ambient air. The system allows fully automated, unattended operation with all three components being concurrently measured.

Although the majority of atmospheric mercury is present in elemental form, differentiation among the three types is important due to the widely varying local impacts of each type. (Particulate and reactive gaseous mercury have higher wet and dry deposition rates than does elemental.) Ambient air speciation is of particular interest close to industrial sources such as waste incinerators which often discharge the majority of their mercury emissions in particulate or ionic form.

One of the greatest problems with conventional particulate mercury measurement methods is that reactive gaseous mercury will be trapped on the filter medium along with the particulate bound mercury. This can result in large measurement artifacts. The Tekran speciation system solves this problem by removing the reactive gaseous component using a denuder before sampling the particulate mercury.

Principles of Operation

During sampling, reactive gaseous mercury in the atmosphere is captured in the Model 1130 Denuder Module. Particulate bound mercury is trapped onto a unique quartz regenerable filter located within the Model 1135. Elemental mercury passes through both units and is continuously analyzed by the Model 2537A. The components are then sequentially desorbed during the analysis phase.

Tekran, 132 Railside Rd. Unit-1, Toronto, ON M3A 1A3. Tel: 416-449-3084; Fax: 416-449-9298.