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VOC analysis from A to Z
Analysing the volatile organic compounds in air. What does that entail, and how do you get started?
Introduction
The process of analysing volatile organic compounds (VOC) includes a number of important steps. A sample on which to perform the analysis must first be taken.
The analysis itself leads to a list of results, but the story doesn’t stop there. A certificate with additional interpretation according to the scope of the project is indispensable.
First we take a sample with VOC...
When a client requests that a particular air stream, product emission or ambient air be analysed for volatile organic compounds (VOC), NOLAB will first take a sample in which these VOC are present.
This sampling or sample preparation can be performed in several ways. Samples can be taken through headspace sampling or directly into air bags or canisters.
...then we analyse this sample on VOC....
To capture the VOC in the sample prior to analysis, the air is passed over an adsorbent in our lab where the VOC are captured and concentrated. The type of adsorbent is selected according to the VOC analysis to be performed.
During analysis, the VOC are released back from the adsorbent and separated. One by one, the components thus enter the detector, which is able to identify and quantify them. Our unique approach at NOLAB, where we aim to identify as much of the VOC present as possible, requires these results to be interpreted manually, meaning more VOC can be correctly identified.
...and establish the results in a certificate
The concentration of the VOC identified is also determined. In this process, the lab associate at NOLAB will take into account all significant parameters such as dilution steps, quantity of sample analysed, etc.
These items are listed on the certificate along with the VOC and their concentration. We discuss the purpose of the analysis with the client in advance. As such, when reporting the results, a very specific interpretation can be given with, if necessary, a test of the results against limit values.
Quality VOC measurements
The above processes are carried out by us with the utmost care. In doing so, we incorporated a number of safety mechanisms such as rapid air-sample measurement in order to gain an idea of the order of concentration’s magnitude. This allows us to better estimate the volume of air to be analysed for best results.
In addition, NOLAB has also developed its own data management system, containing all data concerning the analysis. This allows us to provide swift feedback when questions arise, and check all steps throughout the delicate process. Additional adsorption cartridges are likewise loaded as backup for any additional analyses.
Summary
For a measurement of volatile organic compounds, NOLAB provides
Sampling: collecting air in a bag and canister whether by sample preparation or not
Analysis: identification and quantification of the VOC
Reporting: certificate with additional interpretation tailored to the purpose of the measurement
In doing so, we strive to keep quality high and continually improve.
How can we help?
Do you have questions about VOC analysis? We can be reached via the channels below or leave a message on our contact page.