DYES DERIVED FROM SUCCINIC AND MALEIC ACID AND THEIR DERIVATIVES AS ADSORPTION INDICATORS

A comparative study has been made between the applicability of dyes obtained from succinic and derived succinic acids and the corresponding dyes from maleic acids as adsorption indicators in argen­tometric titrations. It has been shown that whereas succinic acid derivatives resorcinol succinein and itaconein —serve as very useful indicators, the corresponding dyes from maleic acid do not have any applicability. The behaviour has been explained on the existing theories of colour and of adsorption indicators. As a result of the investigation, a new adsorption indicator, resorcinol itaconein, has been described.