Advantages of Canisters

Advantages of Canisters Over Tubes

	Canisters	Tubes
Preconcentrator Performed Under Controlled Conditions	Yes	No
Traps Checked for Blank and Analyte Recovery	Yes	No
Allow Repeat Analyses	Yes	No
Chance for Post Cleaning Contamination	Minor	Yes
Permits Sample Screening	Yes	No
Allows Mild Trapping/Desorption Conditions to Maximum	Yes	No
Requires Power for Sampling	No	Yes (?)
Long Integrated Sampling Times	Yes	No
Tailoring of Sample Size After Collection	Yes	No
Recovery Effects After Exposure to Ozone, NOx, SOx	Minor	?
Analysis of Reactive Compounds (Sulfur, etc.)	Yes	No

	Canisters	Tubes
Holding Time in Weeks, Not Hours	Yes	No
Usable to Part Per Trillion Levels	Yes	No
Shippable by Air	Yes	No
Totally Impermeable to VOC’s	Yes	No
Field Sampling Performed without Power	Yes	No
Prevents Photolytic Reactions	Yes	No
Capable of Storing H2S and Mercaptants	Yes	No

Using accepted EPA methods for compliance, Centek Laboratories routinely identifies known and unknown VOC’s in air, liquid, soil and other matrices.

Our clients come from a broad cross-section of industrial, commercial, governmental and residential sectors.