Spectrophotometric extractive titrations for the determination of traces of metals.
A modification of extractive titrations, spectrophotometric end-point determination, is proposed. There is no need to discard the organic layer after each extraction because specially constructed titration cells are used. Precise, rapid and selective determination of microgram amounts of single cations, and in favourable cases pairs of cations, is possible.
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A. S. Popov's Research Institute for Radio and Telecommunication, Praha 4, Novodvorskà 994, Czechoslovakia.