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|Title:||Comparison of methanol and tetraglyme as extraction solvents for determination of volatile organics in soil|
|Authors:||U.S. Army Toxic and Hazardous Materials Agency.|
Jenkins, Thomas F.
Schumacher, Patricia W.
Purge and trap
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 87-22.|
Abstract: The abilities of methanol and tetraglyme to extract chloroform, benzene, toluene, and tetrachloroethylene from vapor-contaminated soils are directly compared. Comparisons are made both with respect to process kinetics and analyte recovery using an extraction procedure based on equilibration on a wrist-action shaker and determination using a purge-and-trap GC/MS. An equilibration period of 1.0 minutes is recommended for extraction using either methanol or tetraglyme. In all cases methanol was as good as or better than tetraglyme with respect to analyte recovery. This was even the case for soils contaminated with an oily residue. While commercial methanol and tetraglyme both contain measurable levels of volatile aromatics, simple rotary evaporation was successful in removing these contaminants to levels below detection limits for tetraglyme. Thus, for cases where very small amounts of these contaminants must be detected, degassed tegraglyme would be superior. Overall, however, methanol is considered the best choice for extraction of volatile organics where subsequent analysis is to be conducted by purge-and-trap GC/MS.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Special Report|
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|SR-87-22.pdf||1.42 MB||Adobe PDF|