The extraction of As(III) and Ge(IV) from hydrochloric acid solutions by several solvents has been measured. The distribution ratios generally increase in a regular manner as the acid concentration is varied from 2 to 12 F. Differences in extractive power between the solvents carbon tetrachloride, chloroform, bis-(2-chloroethyl) ether and benzene are relatively small. Isopropyl ether shows a maximum in extraction between 7 and 8 F hydrochloric acid for As(III) accompanied by a sharp rise in the solubility of ether in the acid phase as has been observed in the extraction of other elements with this ether.As(III) in hydriodic acid, shows a similar maximum with the solvents used but without the increased phase miscibility.This maximum appears to be related to a change in the nature of the aqueous phase species since the maximum corresponds to a minimum in the solubility of Asli in hydriodic acid.

This paper describes the design of a new, versatile, and low‐cost on‐line LC‐GC interface that allows the fast and reliable introduction of large sample volumes onto a capillary GC column. The sample introduction procedure consists successively of: evaporation of the entire sample (LC fraction), selective removal of the solvent and simultaneously cold‐trapping of the solutes, splitless transfer of the solutes to the GC column, on‐column focusing, GC separation and detection. Quantitative and qualitative aspects of various experimental parameters are evaluated and optimum conditions are reported. The applicability of the method is demonstrated on a synthetic aqueous sample of chlorinated pesticides.

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