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Evaluation of a teflon helix liquid liquid extractor for concentration of trace organics from water into methylene chloride

, : Evaluation of a teflon helix liquid liquid extractor for concentration of trace organics from water into methylene chloride. Water Research 21(2): 179-190

A continuous liquid-liquid extraction system (CLLE) for concentrating trace organics from water into methylene chloride for analysis was designed, built and evaluated. The CLLE uses Teflon coils for phase contact and gravity phase separation. The system includes a self-contained excess solvent distillation chamber, so the methylene chloride is recovered and recycled. A 90 1. Milli-Q water blank was run on the system. The CLLE extract was concentrated to 4 ml by Kuderna-Danish distillation, giving a 22,500:l concentration ratio. Aqueous mixtures of organic compounds were used as test probes to evaluate the CLLE. Recovery values were determined for these compounds using CLLE and batch LLE (separatory funnel liquid-liquid extraction), and CLLE recoveries were found to be similar to those of batch LLE. Several statistical methods were applied to the data. For 9 of the 12 compounds that could be evaluated statistically, recoveries of 1 and 12.5 l. aqueous samples extracted by CLLE were found to be equivalent to 1 liter batch LLE recovery values. The units are portable, and are currently in service sampling raw and treated water at locations in the northeastern USA.

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