Mercury(II) ion-selective electrode based on dibenzodiazathia-18-crown-6-dione

A PVC-based membrane of dibenzodiazathia-18-crown-6-dione reveals a Nernsti an potentiometric response for Hg2+ over a wide concentration range (8.0 x 10(-6) to 1.0 x 10(-2) mol dm(-3)). it has a response time of about 10 s an d can be used for at least 3 months without any divergence. The proposed el ectrode revealed very good selectivities for Hg2+ over a wide variety of al kali, alkaline earth, transition and heavy metal ions and could be used in a pH range of 0.5-2.5. It was successfully used as an indicator electrode i n potentiometric titration of mercury ions.