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| Case Study Featured in Issue 20.2 |
| Multi-Bed Adsorbent Tube Provides
Better Results |
 The
Problem
A customer who was interested in sampling for methylene chloride in
an indoor air quality application called our Technical Service department
recently. To determine what adsorbent tube would be required, we asked
the customer what other compounds could be included in the sample.
We learned that he was going to do the sampling in an environment
that contained aromatic hydrocarbons (BTEX) in addition to methylene
chloride.
The customer inquired about a thermal desorption tube to do this analysis.
He was interested in a TDU tube that would be packed with a single
bed of Carboxen-1000 material to do the analysis. He knew from published
literature that this material would trap organic compounds with carbon
chain lengths in the C2-C5 range.
The Solution
Our Technical Service representative informed the customer that the
Carboxen-1000 custom TDU tube would not be a good choice for the analysis.
Some of the BTEX compounds could be too strongly retained on the Carboxen-1000
material.
He suggested that the customer use our Carbotrap 317 TDU tubes which
contains three adsorbent beds: Carbopack C, Carbopack B, and Carboxen-1000.
The Carbopack C will trap organic compounds with carbon chain lengths
in the C12-C20 range. The Carbopack B will trap compounds in the C5-C12
range. The Carboxen-1000 will trap compounds in the C2-C5 range. The
first two beds will retain the BTEX compounds and serve to protect
the bed of Carboxen-1000 material, which will collect the methylene
chloride.
By using a multiple adsorbent bed tube, the customer was able to isolate
the target compound of interest and effectively deal with the interfering
aromatic hydrocarbons. |
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For more information,
see |
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T402025 (1,817 KB)  "A Tool for Selecting an Adsorbent for Thermal Desorption
Applications" |
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| Other information related to this article: |
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