Adjective
(chemistry) Describing a form of titration in which the titrant forms a complex (usually coloured) with the analyte.
(chemistry) Describing any indicator that is used in such titrations.
Source: en.wiktionary.orgOther complexometric indicators are Eriochrome Black T for the titration of calcium and magnesium ions, and the chelating agent EDTA used to titrate metal ions in solution. Source: Internet
In general, they require specialized complexometric indicators that form weak complexes with the analyte. Source: Internet