SKC Frequently Asked Questions
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1. In-line Trap 225-22-01: What sorbent type and quantity is contained in the in-line trap?

The in-line traps contain over 8 grams of sorbent which is a 50/50 mixture of silica gel/activated charcoal. This mixture will trap both polar and non-polar compounds.

2. What is the density of the polyurethane foam (PUF) in SKC Cat. No. P226131?

The foam density is 0.0225 gram/cm3 (± 10%).

3. Why do some sampling media have a limited shelf-life?

To maintain low background levelsTo ensure chemical coatings are stabileTo ensure open-ended tubes are clean

4. How do I calibrate a sample pump with an OVS Tube?

Use the Tubing/Adapter Kit Cat. No. 224-31.

5. To which sorbents are SKC Anasorb sorbents comparable?

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…

6. What are the surface areas of SKC Anasorb CMS, Anasorb 747, and Anasorb CSC sorbents?

The surface area for Anasorb 747 is 980 square meters/gram. The surface area for Anasorb CSC is 1200 square meters/gram.The surface area for Carbosieve S-111 is 975 square meters/gram. These are all 20/40 mesh particle size.

7. How should sorbent tubes be stored before use?

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.

8. Can a bigger mesh size be used in a thermal desorption tube to reduce back pressure?

Yes. A 20/35 mesh size can be used as it does give the same results as the 60/80 mesh sorbent specified in EPA methods. It could result in less wear and tear on pumps due to lower back pressure. It seems that all EPA methods that specify a thermal desorption…

9. How do I know how much of chemical "X" the sorbent tube can collect?

Sampler capacity is a conservative estimate of the total mass of contaminant which can be collected on the sampling media with loss or overloading. For gases and vapors, NIOSH has defined sampler capacity as two-thirds of the experimental breakthrough capacity…

10. What is the highest flow rate that can be used for sorbent tube sampling?

This will be dependent on the sorbent tube being used, the environment being sampled, and the expected concentrations. If the sorbent tube has a small diameter and contains tightly packed sorbent material of a small mesh size, the maximum flow rate will be…

11. Is it possible to increase the flow rate of a method to lower the detection limit?

NIOSH recommends that the recommended maximum flow rate not be exceeded. Instead, sample longer while closely monitoring breakthrough.