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The ChemComb Model 3500 Speciation Sampling Cartridge is the result of a multi-year development at the Harvard School of Public Health in flexible air sampling hardware.

The ChemComb Model 3500 Speciation Sampling Cartridge is the result of a multi-year development at the Harvard School of Public Health in flexible air sampling hardware. The cartridges can be configured in a number of ways for a variety of collection and sample analysis requirements.

Product Details

Applications

The cartridge can be configured in a wide variety of ways to address widely-varying sampling and analysis requirements, including the use of different 47 mm diameter filter materials. The cartridge can be used in combination with R&PsPartisol Speciation Sampler,Mini-Partisol Sampler or other pumping systems to collect gases and/or particles from ambient air.

Technology

The ChemComb Speciation Sampling Cartridge was developed by the Harvard School of Public Health for the selective sampling of particulate matter and/or gaseous species from ambient air. It can include the honeycomb denuder patented by Harvard University to strip or collect selected gases from a sample stream. PM inlets are available for PM-2.5 or PM-10 sampling, and an organics configuration can collect PAH and other constituents from ambient air.Regulatory Status .

When installed in the Partisol Speciation Sampler, appropriately-configured ChemComb Speciation Sampling Cartridges fulfill the air sampling requirements of the USEPA PM speciation sampling network.

The USEPA has contracted with Research Triangle Institute for the preparation and analysis of ChemComb Cartridges.Details

PM/Gas Sampling Cartridges...

The ChemComb Speciation Sampling Cartridge is a flexible, field-proven module for the sampling of atmospheric gases and particles. It can be configured for single- or multi-stage sampling of PM-2.5 or PM-10. The cartridge can be outfitted with honeycomb denuders for the stripping and/or sampling of selected gases.

System Configuration

The sampling device is made up of a single cartridge that contains a well-characterized inlet with a PM-2.5 or PM-10 impactor, up to two honeycomb denuders for the removal or collection of selected gases, and a four-stage 47 mm diameter filter pack for the collection of particle-related components. PM-2.5 inlets are available for flow rates of 10 and 16.7 l/min, and the PM-10 inlet operates at a 10 l/min flow rate. The honeycomb denuders achieve their high collection efficiency at the 10 l/min flow rate. Systems can also be configured without honeycomb denuders to operate as a multistage filter pack for PM-2.5 or PM-10.

All sampling components are assembled in the laboratory and enclosed in the samplers container. This eliminates the risks inherent with in-field assembly of sampling components. A small, rugged form factor permits easy transport or shipment of ChemComb cartridges in its assembled form between the laboratory and the air sampling site.

ChemComb cartridges can be used in a variety of sampling systems, ranging from R&PsPartisol Model 2300 Speciation Sampler,Mini-Partisol Model 2100 Air Sampler andoriginal Partisol Model 2000 Air Sampler, to simple configurations involving a flow-regulated pump.

ChemComb Cartridge, showing fully-outfitted denuder section

ChemComb Cartridge, showing parts in filter section

Sample Inlets

The sample inlet is designed to reduce the sample streams residence time and contact with surfaces. A PTFE coating used in many applications minimizes losses of HNO3 and Nh4. Clear anodized inlets are available for the collection of organic and elemental carbon on quartz fiber filters to avoid possible interferences from inlet surface coatings.

The system achieves its sharp PM-2.5 or PM-10 size selection by means of impaction onto a greased impactor well, resulting in a cut points characteristics similar to those used in USEPA reference-designated samplers. Analyses by the Harvard School of Public Heath show the cut point performance for the10 l/min PM-2.5 inlet, the16.7 l/min PM-2.5 inlet, and the10 l/min PM-10 inlet.

Inlet (left) and well impactor (right)

The sample stream follows a straight flow path between the PM-2.5 or PM-10 impactor and the four-stage filter pack.

The ChemComb inlets are coded by shape and color to indicate their size cut point and flow rate. See the photos below.

PM-2.5 inlet, 10 l/min, anodized

PM-2.5 inlet, 10 l/min, PTFE coated

PM-2.5 inlet, 16.7 l/min, anodized

PM-2.5 inlet, 16.7 l/min, PTFE coated

PM-10 inlet, 10 l/min, anodized

PM-10 inlet, 10 l/min, PTFE coated

Honeycomb Denuder

Honeycomb denuders are small, rugged, and contain a large internal surface area. They are 47 mm in diameter, and only 38 mm long. Their internal surface area of 508 cm² is made possible by 212 hexagonal flow channels that are 2 mm on a side. This results in a much higher loading capability than conventional 200 mm long annular denuders, which typically have an internal surface area of approximately 310 cm². The entire ChemComb cartridge is less than 30 cm long.

Honeycomb denuders are made completely of glass to avoid gas losses that can take place due to nitric acid and ammonia adsorption on the epoxy resin sometimes used in annular denuders. The use of the same material throughout the denuder avoids cracking that can otherwise occur due to large temperature changes.

Honeycomb denuders are efficient collectors of inorganic gases such as HONO, HNO3 and Nh4 through the application of different coatings in the laboratory. A denuder may be coated with a different gas-adsorbing substance each time it is used.

Typically, a sodium carbonate/glycerol coating is used for the collection of acidic gases such as SO2, HONO and HNO3. A second denuder in series is often coated with a citric acid/glycerol solution for the collection of basic gases such as Nh4. Ion chromatography is often used as the analytical method.

Click here to download a packet of fact sheets on the use of the honeycomb denuder in the ChemComb system.

Filter Pack

The four-stage 47 mm diameter filter pack is made of Teflon material to avoid interferences. It is not necessary to populate each stage of the filter holder with a collection filter. An intensive application of the ChemComb cartridge involves the following three 47 mm diameter filters: 1) a 2 µm pore-size Teflon filter for the collection of fine PM; 2) a glass fiber filter coated with sodium carbonate (Na2CO3) for the collection of nitric acid (HNO3); and 3) a glass fiber filter coated with citric acid for the collection of ammonia (Nh4).

Results

Testing of PM-2.5 ChemComb Cartridges performed by the Harvard School of Public Health show that particulatemass, sulfate andnitrate through a 10 l/min inlet and particulatemass,sulfate andnitrate through a 16.7 l/min inlet compare closely with values obtained from a USEPA PM-2.5 reference-designated air sampler.

Future Configurations

Rupprecht & Patashnick is currently taking steps in conjunction with a number of institutions to develop new configurations of the ChemComb. One of the first will be a flexible design for the sampling of organic materials and gases contained in ambient air.


ANALIZADORES DE PARICULADO


Speciation Sampling Cartridge - ChemComb Model 3500
The ChemComb Model 3500 Speciation Sampling Cartridge is the result of a multi-year development at the Harvard School of Public Health in flexible air sampling hardware. The ChemComb Model 3500 Speciation Sampling Cartridge is the result of a multi-year development at the Harvard School of Public Health in flexible air sampling hardware. The cartridges can be configured in a number of ways for a variety of collection and sample analysis requirements. Product Details Applications The cartridge can be configured in a wide variety of ways to address widely-varying sampling and analysis requirements, including the use of different 47 mm diameter filter materials. The cartridge can be used in combination with R&PsPartisol Speciation Sampler,Mini-Partisol Sampler or other pumping systems to collect gases and/or particles from ambient air. Technology The ChemComb Speciation Sampling Cartridge was developed by the Harvard School of Public Health for the selective sampling of particulate matter and/or gaseous species from ambient air. It can include the honeycomb denuder patented by Harvard University to strip or collect selected gases from a sample stream. PM inlets are available for PM-2.5 or PM-10 sampling, and an organics configuration can collect PAH and other constituents from ambient air.Regulatory Status . When installed in the Partisol Speciation Sampler, appropriately-configured ChemComb Speciation Sampling Cartridges fulfill the air sampling requirements of the USEPA PM speciation sampling network. The USEPA has contracted with Research Triangle Institute for the preparation and analysis of ChemComb Cartridges.Details PM/Gas Sampling Cartridges... The ChemComb Speciation Sampling Cartridge is a flexible, field-proven module for the sampling of atmospheric gases and particles. It can be configured for single- or multi-stage sampling of PM-2.5 or PM-10. The cartridge can be outfitted with honeycomb denuders for the stripping and/or sampling of selected gases. System Configuration The sampling device is made up of a single cartridge that contains a well-characterized inlet with a PM-2.5 or PM-10 impactor, up to two honeycomb denuders for the removal or collection of selected gases, and a four-stage 47 mm diameter filter pack for the collection of particle-related components. PM-2.5 inlets are available for flow rates of 10 and 16.7 l/min, and the PM-10 inlet operates at a 10 l/min flow rate. The honeycomb denuders achieve their high collection efficiency at the 10 l/min flow rate. Systems can also be configured without honeycomb denuders to operate as a multistage filter pack for PM-2.5 or PM-10. All sampling components are assembled in the laboratory and enclosed in the samplers container. This eliminates the risks inherent with in-field assembly of sampling components. A small, rugged form factor permits easy transport or shipment of ChemComb cartridges in its assembled form between the laboratory and the air sampling site. ChemComb cartridges can be used in a variety of sampling systems, ranging from R&PsPartisol Model 2300 Speciation Sampler,Mini-Partisol Model 2100 Air Sampler andoriginal Partisol Model 2000 Air Sampler, to simple configurations involving a flow-regulated pump. ChemComb Cartridge, showing fully-outfitted denuder section ChemComb Cartridge, showing parts in filter section Sample Inlets The sample inlet is designed to reduce the sample streams residence time and contact with surfaces. A PTFE coating used in many applications minimizes losses of HNO3 and Nh4. Clear anodized inlets are available for the collection of organic and elemental carbon on quartz fiber filters to avoid possible interferences from inlet surface coatings. The system achieves its sharp PM-2.5 or PM-10 size selection by means of impaction onto a greased impactor well, resulting in a cut points characteristics similar to those used in USEPA reference-designated samplers. Analyses by the Harvard School of Public Heath show the cut point performance for the10 l/min PM-2.5 inlet, the16.7 l/min PM-2.5 inlet, and the10 l/min PM-10 inlet. Inlet (left) and well impactor (right) The sample stream follows a straight flow path between the PM-2.5 or PM-10 impactor and the four-stage filter pack. The ChemComb inlets are coded by shape and color to indicate their size cut point and flow rate. See the photos below. PM-2.5 inlet, 10 l/min, anodized PM-2.5 inlet, 10 l/min, PTFE coated PM-2.5 inlet, 16.7 l/min, anodized PM-2.5 inlet, 16.7 l/min, PTFE coated PM-10 inlet, 10 l/min, anodized PM-10 inlet, 10 l/min, PTFE coated Honeycomb Denuder Honeycomb denuders are small, rugged, and contain a large internal surface area. They are 47 mm in diameter, and only 38 mm long. Their internal surface area of 508 cm² is made possible by 212 hexagonal flow channels that are 2 mm on a side. This results in a much higher loading capability than conventional 200 mm long annular denuders, which typically have an internal surface area of approximately 310 cm². The entire ChemComb cartridge is less than 30 cm long. Honeycomb denuders are made completely of glass to avoid gas losses that can take place due to nitric acid and ammonia adsorption on the epoxy resin sometimes used in annular denuders. The use of the same material throughout the denuder avoids cracking that can otherwise occur due to large temperature changes. Honeycomb denuders are efficient collectors of inorganic gases such as HONO, HNO3 and Nh4 through the application of different coatings in the laboratory. A denuder may be coated with a different gas-adsorbing substance each time it is used. Typically, a sodium carbonate/glycerol coating is used for the collection of acidic gases such as SO2, HONO and HNO3. A second denuder in series is often coated with a citric acid/glycerol solution for the collection of basic gases such as Nh4. Ion chromatography is often used as the analytical method. Click here to download a packet of fact sheets on the use of the honeycomb denuder in the ChemComb system. Filter Pack The four-stage 47 mm diameter filter pack is made of Teflon material to avoid interferences. It is not necessary to populate each stage of the filter holder with a collection filter. An intensive application of the ChemComb cartridge involves the following three 47 mm diameter filters: 1) a 2 µm pore-size Teflon filter for the collection of fine PM; 2) a glass fiber filter coated with sodium carbonate (Na2CO3) for the collection of nitric acid (HNO3); and 3) a glass fiber filter coated with citric acid for the collection of ammonia (Nh4). Results Testing of PM-2.5 ChemComb Cartridges performed by the Harvard School of Public Health show that particulatemass, sulfate andnitrate through a 10 l/min inlet and particulatemass,sulfate andnitrate through a 16.7 l/min inlet compare closely with values obtained from a USEPA PM-2.5 reference-designated air sampler. Future Configurations Rupprecht & Patashnick is currently taking steps in conjunction with a number of institutions to develop new configurations of the ChemComb. One of the first will be a flexible design for the sampling of organic materials and gases contained in ambient air.