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Related SKC Product FAQs
| SKC Catalog Number: | 226- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Why do some sampling media have a limited shelf-life? | | Answer: |
- To maintain low background levels
- To ensure chemical coatings are stabile
- To ensure open-ended tubes
are clean
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| SKC Catalog Number: | 226- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | How do I calibrate a sample pump with an OVS Tube? | | Answer: | Use the Tubing/Adapter Kit Cat. No. 224-31. |
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| SKC Catalog Number: | 226- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | What are the surface areas of SKC Anasorb CMS, Anasorb 747, and Anasorb CSC sorbents? | | Answer: | The surface area for Anasorb CMS is 1700 square meters/gram.
The surface area for Anasorb 747 is 980 square meters/gram.
The surface area for Anasorb CSC is 1200 square meters/gram.
These are all 20/40 mesh particle size. |
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| SKC Catalog Number: | 226-, 575-, 590-, 520- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | To which sorbents are SKC Anasorb sorbents comparable? | | Answer: | Anasorb 708 is equivalent to Chromosorb 108.
Anasorb 727 is equivalent to Chromosorb 106.
Anasorb 747 is a SKC proprietary sorbent.
Anasorb C300 is equivalent to Hydrar, Carulite.
Anasorb CMS is equivalent to Carbosieve S-111.
Anasorb CSC is a SKC proprietary sorbent.
Anasorb GCB1 is equivalent to Carbotrap B (20/40), Carbopack B (60/80).
Anasorb GCB2 is equivalent to Carbotrap C (20/40), Carbopack C (60/80).
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| SKC Catalog Number: | 226-119 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Why is my lab finding higher background levels of formaldehyde on sampling media than those reported by SKC? | | Answer: | Page 3 of OSHA Method 1007 reports that storing samplers at elevated temperatures will cause DNPH to decompose. The decomposition product, 2,4-dinitroaniline, may be seen as formaldehyde by some labs if they are using a short/fast GC column with inadequate plate count. EPA Method TO-11A, Section 13.2.2 recommends a GC column efficiency of > 5000 theoretical plates. This column will allow for the effective separation of the formaldehyde peak from interfering peaks. |
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| SKC Catalog Number: | 226-Series | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | How should sorbent tubes be stored before use? | | Answer: | Sorbent tubes with sorbent that is not coated/treated in any way can be stored at room temperature or in the refrigerator.
For tubes that contain sorbent that is coated/treated, check storage information in operating instructions or on the packaging. |
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| SKC Catalog Number: | 231-, 232-, 233-, 236-, 238-, 240-, 245- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Where can I find information on the stability of specific compounds in sample bags? | | Answer: | See the following references:
*Perkins, Jimmy L., “Gases and Vapors – Bags, Rigid Containers, and Impingers,” Industrial Hygiene News, July 1997.
EPA Method 0040 Sampling and Analysis of Volatile Organic Compounds Using Tedlar Bags, http://www.epa.gov/sw-846/under.htm
NIOSH Method 3700 Benzene by Portable GC, http://www.cdc.gov/niosh/docs/2003-154/
OSHA Method ID 172 Carbon Dioxide in Workplace Atmospheres, http://www.osha.gov/dts/sltc/methods/inorganic/id172/id172.html
NIOSH 3, S249 Second edition method, Carbon Dioxide, http://www.cdc.gov/niosh/homepage.html
NIOSH 6603, Fourth edition method, Carbon Dioxide, http://www.cdc.gov/niosh/homepage.html
OSHA Method ID 210 Carbon Monoxide in Workplace Atmospheres, http://www.osha.gov/dts/sltc/methods/inorganic/id210/id210.html
NCASI 656 Technical Bulletin No. 0656: A Study of the Tedlar Bag Sampling for the Determination of Reduced Sulfur Gas Concentrations in Workplace Atmospheres, http://www.ncasi.org//Publications/Detail.aspx?id=952
NIOSH Method 3702 Ethylene Oxide by Portable GC, http://www.cdc.gov/niosh/homepage.html
NIOSH 5, S84 Methyl Acetylene, http://www.cdc.gov/niosh/homepage.html
NIOSH 6, S85 Methyl acetylene propadiene MXT, http://www.cdc.gov/niosh/homepage.html
NIOSH Method 6600 Nitrous Oxide, http://www.cdc.gov/niosh/homepage.html
NIOSH Method 6602 Sulfur hexafluoride, http://www.cdc.gov/niosh/homepage.html
NIOSH 6, S245 Sulfur Fluoride, http://www.cdc.gov/niosh/homepage.html
NIOSH Method 3701 Trichloroethylene, http://www.cdc.gov/niosh/homepage.html |
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| SKC Catalog Number: | 231, 232, 233, 238, 240 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Tedlar bags: Can they be used at elevated temperatures? | | Answer: | SKC Tedlar bag material has a melting point of 374 F (190 C). However, the bag fitting actually dictates the maximum operating temperature of the sample bag.
Tedlar bags with stainless steel fittings have a maximum operating temperature of 225 F (107.2 C) based on the temperature tolerance of the fitting’s O-rings.
Tedlar bags with polypropylene fittings have a maximum operating temperature of 200 F (93.3 C) based on the temperature tolerance of the fitting material. Strain on the fitting should be avoided at this temperature. |
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| SKC Catalog Number: | 231, 232, 233, 240, 243, 238 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Tedlar bag samples: Can I ship them by air? | | Answer: | There will be no problem if the cabin is pressurized; otherwise, samples will expand and sample loss is possible. In this case, use a larger bag and fill half-way to allow for expansion. Check with the carrier for shipping regulations for collected samples in bags. |
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| SKC Catalog Number: | 231, 232, 233, 240, 243, 238 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Tedlar bags: Can I reuse them? | | Answer: | For more information see McGarvey, L.J., Shorten, C.V., "The effects of Adsorption on the Resusability of Tedlar Air Sample Bags, " AIHA Journal, Vol. 61, May/June 2000, pp. 375-380.
SKC does not recommend or warrant reuse of air sample bags. |
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| SKC Catalog Number: | 231-, 232-, 233-, 240-, 243-, 245-, 236-, | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | What is the maximum compound boiling point at which I can sample using a sample bag? | | Answer: | Do not sample compounds with a boiling point > 249.8 F (121 C). |
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| SKC Catalog Number: | 231-945 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Why is the plunger in the Vac-U-Tube difficult to move? | | Answer: |
- First use of Vac-U-Tube: Depending on how long the Vac-U-Tube has been idle, the plunger may be difficult to move upon first use. Solution: Move it. The inside of the Vac-U-Tube is coated with a lubricant during manufacturing. Remove the face plate and move the plunger up and down several times to re-coat the O-ring.
- Plunger fails to move at all after cleaning the Vac-U-Tube: Because of close tolerances, the Vac-U-Tube plunger will not slide readily if the inside of the tube is not lubricated. Spray fluoropolymer/silicone spray on the inside of the tube to facilitate plunger movement
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| SKC Catalog Number: | 231-945 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Can the air sample in the bag become contaminated from the lubricant in the Vac-U-Tube or on its plunger? | | Answer: | If the procedures in the Vac-U-Tube Operating Instructions are followed, the possibility of contamination from the lubricant should be remote. The sampling bag is connected to a piece of PTFE tubing, which passes through the face plate via a stainless steel compression fitting. The sample should never come into contact with anything other than inert PTFE or stainless steel. |
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| SKC Catalog Number: | 236-001, 237-001 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | What is the maximum temperature at which I can use SamplePro FlexFilm bags? | | Answer: | SamplePro FlexFilm bag material can withstand temperatures up to 140 F (60 C). |
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| SKC Catalog Number: | 245- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | What is the stability of various gases in SKC FlexFoil® Bags? | | Answer: | See the SKC website for various reports at the FlexFoil Grab Bags page. |
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| SKC Catalog Number: | 245- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Are FlexFoil Sample Bags suitable for collecting VOCs? | | Answer: | FlexFoil® Sample Bags are not suitable for collecting VOCs due to the constituents of the FlexFoil material. See www.skcinc.com for alternative bag materials. |
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| SKC Catalog Number: | 245- | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | Which bag material should be used when collecting sulfur dioxide? | | Answer: | SKC has not tested this compound in bags. However, the SKC Catalog references an Industrial Hygiene News article written by Jimmy Perkins that indicates that mylar bags are suitable for sulfur dioxide at 1 ppm. SKC FlexFoil® bags are the closest match to mylar. |
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| SKC Catalog Number: | P226131 | | Catagory: | Active Vapor Sampling | | Sub-category: | Sample Bags and Accessories | | Question: | What is the density of the polyurethane foam (PUF) in SKC Cat. No. P226131? | | Answer: | The foam density is 0.0225 gram/cm3 (± 10%). |
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