Extraktionsanalytische Verwendung des nicht sulfonierten Eriochromschwarz T

Erio OS (which is analogous to Eriochrome black T without sulfonic groups) is soluble in organic liquids. It forms red extractable complexes with several bivalent metals and also indium and gallium. The complex formation can be selectively prevented by masking agents. Several specific tests of high sensitivity are described. The extractable metal complexes can be determined very accurately in the organic phase by photometry. Most of the other metal ions do not interfere, even if present in considerable proportions. © 1956 Springer-Verlag.