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首页> 美国政府科技报告 >Preliminary study of extraction solvents for CW-agents and their decomposition products (3:1 (methylene chloride:isopropanol) vs. methylene chloride)
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Preliminary study of extraction solvents for CW-agents and their decomposition products (3:1 (methylene chloride:isopropanol) vs. methylene chloride)

机译：CW-试剂及其分解产物（3：1（二氯甲烷：异丙醇）与二氯甲烷的萃取溶剂的初步研究）

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The major focus of this study was to explore the possibility of using different extraction solvents (or solvent combinations) to isolate CW agents and their degradation products from environmental and industrial samples. The general approach for extracting, e.g. water samples, required the use of a 3:1 (methylene chloride:isopropanol) extraction solvent. Although the 3:1 solvent extraction work-up methods provided excellent results in several Inter-laboratory Comparison Tests, the implementation of these methods for CW on-site analysis exercises was difficult (the methods require cumbersome equipment and are labor intensive). However, due to the time, power, and size restraints set forth by the Chemical Warfare Convention (CWC) for a CW on-site inspection, LLNL developed new sample work-up methods. The approach selected by LLNL incorporated solid phase extraction (SPE) techniques. It is evident from this preliminary study that new or previously used extraction solvents should be re-investigated. It was determined that care must be taken in handling the samples prior to NMR measurements. Also, it was determined that the four target compounds used in this study were extracted on average 18% higher with 3:1 (CH(sub 2)Cl(sub 2): IPA) vs. CH(sub 2)Cl(sub 2). However, additional target compounds need to be investigated using this extraction solvent to determine which classes of compounds are better extracted by the use of a 3:1 solvent system. This preliminary study clearly reveals that a mixed solvent system can yield better extraction efficiencies for mixture of compounds in aqueous samples.

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