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|Title:||Salting-out solvent extraction method for determining low levels of nitroaromatics and nitramines in water|
|Authors:||U.S. Army Toxic and Hazardous Materials Agency.|
Miyares, Paul H.
Jenkins, Thomas F.
|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.)) ; 90-30.|
Abstract: A protocol was developed for determining low levels of nitroaromatics and nitramines in ground water. Sample preparation employs salting-out extraction with acetonitrile and NaCl, further preconcentration of extract by solvent evaporation on a Kuderna-Danish concentrator, dilution of the concentrate with water, and filtration through a 0.5-~m Millex-SR filter. Separation is achieved using reversed-phase high-performance liquid chromatography with an LC-8 (3.3 cm) column using a 70.7/27.8/1.5 (v/v/v) water-methanol-THF eluent, and determination is obtained on a UV detector at 254 nm. This procedure provides far lower detection limits than the earlier protocol, which involved direct injection onto an LC-18 (25 cm) column eluted with 50/50 (v/v) methanol-water. The new method is capable of simultaneously determining RDX, TNB, DNB, TNT, 2,4-DNT, 2,6-DNT, 2-Am-DNT and 4-Am-DNT in less than five minutes, with reporting limits ranging from 0.02 to 0.84 ~g/L. Analytical recovery averaged greater than 95%. Note: Certain scientific symbols cannot be rendered by this system's character set. An ~ has been placed to indicate the presence of a missing symbol. These symbols will be present in the downloaded file.
|Rights:||Approved for Public Release, Distribution is Unlimited|
|Appears in Collections:||Special Report|
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|SR-90-30.pdf||2.08 MB||Adobe PDF|