Tekran - Model 1130 - Oxidized Mercury Speciation Unit
From Ambient Air
The Tekranh Model 1130 Oxidized Mercury Speciation Unit expands the Model 2537 Mercury Vapor Analyzer capabilities to simultaneously monitor elemental and gaseous oxidized mercury (GOM, aka RGM) species in ambient air. The patented Model 1130 is the only system in the world capable of automated mercury speciation determinations in air. The Model 1130 is an invaluable tool for mercury detection, research and monitoring programs and is well known for ruggedness, reliability, and performance in extreme environments. Extended instrument status and performance is monitored using Tekran DataCom software to provide the operator with continuous quality assurance results.
Measurement of GOM with the Tekran Model 1130 is the important link connecting deposition of air mercury to sensitive aquatic ecosystems. Emissions of GOM from point sources, in-situ production and transport can result in locally enhanced mercury deposition. Thus air speciation of mercury is of particular interest close to industrial sources. Over 100 peer-reviewed articles have been published featuring data generated by the Tekran Model 1130 at field sites throughout the world. The Tekran 2537-1130-1135 Atmospheric Mercury Speciation System has been chosen by networks around the world, including the, Canadian-CAPMoN, NADP AMNet, EU EMEP, Korea-NIER, Chinese Academy of Sciences and others around the world.
The majority of atmospheric mercury is present in elemental form, but differentiation is important due to the greater local impact of reactive (ionic) forms. The Model 1130 provides a supplemental pump system to minimize sample collection periods, and produce mercury-free air for use during analytical cycles.
- Integrates seamlessly with the Tekran 2537 Analyzer
- Separate controller allows sensitive components to be indoors
- Adsorbing surface is regenerated with each desorption cycle
- Data logging option captures flows and temperatures
- 1102 Zero Air Dryer
The Tekran Model 1130 Mercury Speciation Unit allows the Model 2537 Mercury Vapor Analyzer to simultaneously monitor both elemental and reactive gaseous mercury (RGM) species in ambient air. Although the majority of atmospheric mercury is present in elemental form, differentiation is important due to the greater local impact of reactive (ionic) forms. (Reactive mercury has much higher wet and dry deposition rates than does elemental.) Speciation is of particular interest close to industrial sources such as waste incinerators which may discharge the majority of their mercury emissions in ionic (Hg2+) form, in particular mercuric chloride. (HgCl2).
The system is capable of operating in conjunction with the Model 1135 Particulate Mercury Unit. This module mounts directly above the Model 1130 and provides the additional ability to measure fine fraction (< 2.5 micron) particulate bound mercury simultaneously with the elemental and reactive forms. Model 1130 Oxidized Mercury Speciation Module
The Model 1130 generates mercury free air (Zero Air) for use in the system by passing ambient air through a series of mercury scrubbing filters. Recent research has demonstrated that the moisture in the air can have a negative impact on zero air quality and overall instrument performance. To overcome this issue, Tekran developed the Model 1102 Air Dryer to supply the Zero Air generation system with a constant supply of moisture-free air.
Principles of Operation
The Model 1130 uses a process developed and pat- ented by Tekran. A specially coated annular denuder captures reactive mercury while allowing elemental mercury to pass through. During the sampling (ad- sorption) phase, the Model 2537 provides real time measurement of elemental mercury. During the analysis (desoiption) phase, the denuder is flooded with Zero Air and heated. Hie captured reactive mer- cury is thermally desorbed and reduced to elemental form. The Model 2537 detects this eluted mercury, providing a measurement of total reactive mercury captured during the previous sampling period. The desoiption process also regenerates the denuder coat- ing. After cooling, the denuder is ready for another cycle. All timing parameters on the Model 1130 are programmable, allowing automatic RGM readings to be taken at user specified intervals. (From 30 minutes to 6 hours).
The denuder module is located out of doors, eliminating the problems inherent in transport- ing reactive mercury. The mo- dule is insulated and tem- perature controlled to allow stable year round operation.
A heated line is used to minimize losses while carry- ing sample air and zero air between the various system components. The heated line also eliminates potential for condensation in the line and keeps the sample line clean by preventing surface adsorption of organic compounds present in ambient air.
The regenerable annular denuder can be periodically recoated, as required. Field replacement of the de- nuder is simple and does not require tools. The de- nuder can be rinsed using deionized water and re- coated in the field. Alternatively, additional denuders may be supplied with the sampler to allow exchange m the field with subsequent recoating in your lab.
The pump module generates the addi- tional flow required to increase loadings on the denuder. A closed loop con- troller using a pump and mass flow meter guarantees accurate flow rates. The same pump and MFM combination is used during the analysis phase to generate the zero air required for de- sorption. The pump module also provides the zero air required by the instrument during CLEAN and CALIBRATION cycles, thereby eliminating the need for a separate pressurized zero air cylinder and regulator.
The control unit allows timed and event driven control of the various instrument functions required for the Model 1130. It is fully synchronized with the opera- tions of the Model 2537 analyzer. All Model 1130 sample and desorb cycle timings are fully program- mable. Model 2537 routine calibrations are initiated by this unit to ensure that calibrations do not disrupt desorption operations. The control module is also ca- pable of managing the analysis sequence of the Model 1135 particulate unit.
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