The most common indicators in complexometric titrations are organic dyes which function by forming a colored complex with the metal ion being titrated. During the reaction, EDTA replaces the indicator to form a more stable complex with metal and when the reaction is completed the change for the color is observed.
Chrome Azurol S is chemical indicator C 2215 (OTTO) Chromazurol S Cas used also for estimating fluoride.
CHROMAZUROL S METAL PM INDICATOR Make a 5% solution in fresh water by adding the powder slowly to the water while stirring.
The chrome azurol S (CAS) assay is a universal colorimetric method that detects siderophores independent of their structure.
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