Verfahren und Vorrichtung zum Nachweis von Metallionen in waessrigen Medien
The invention refers to a process and a device for the detection of metal ions in aqueous media. The metal ions to be detected are extracted from the aqueous medium by means of substance-specific carrier substances of an organic, immobilized liquid diaphragm and are transferred to an acid hydrogel. At the phase boundary between the liquid diaphragm and the hydrogel the metallic ions to be detected are displaced by hydrogel protons originating from the metal compounds when they permeate through the liquid diaphragm. The metal ions are directly detected in the hydrogel by metal-specific indicators, or are indirectly detected by using known methods by measuring the resulting rise in pH in the hydrogel or the change in dielectric characteristics or the change in the conductivity of the hydrogel.
DE 1990-4039157 A: 19901207