一种通过用NaHEDTA进行络合滴定定量钙离子的新型pH敏感方法。

A novel pH-sensitive method for the quantification of Ca ions by complexometric titration with NaHEDTA.

作者信息

Bhochiya Rahul, Mondal Pradip Kumar, Balkrishna Shah Jaimin

机构信息

Department of Chemistry, Government Commerce & Science College Dahej, Bharuch, Gujarat 392 130, India, (Affiliated with Veer Narmad South Gujarat University, Surat, Gujarat, India).

Elettra Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park, 34149 Basovizza, Trieste, Italy.

出版信息

Anal Methods. 2024 Aug 22;16(33):5628-5632. doi: 10.1039/d4ay00782d.

DOI:10.1039/d4ay00782d

PMID:39136346

Abstract

A simple and accurate complexometric titration has been developed by the reaction between Ca ions (pH 7) and NaHEDTA (pH 11) solutions. Formation of a Ca-EDTA complex and release of H ions in the system were traced by a decrease in the pH. At the equivalence point of the titration, a sharp increase in the pH was observed. Looking at the working pH range (pH 6.2-7.5) of this method, another complexometric titration method has been developed by using bromothymol blue as a pH sensitive indicator. This is the first report of a complexometric titration by using an acid base indicator.

摘要

通过钙离子（pH 7）与NaHEDTA（pH 11）溶液之间的反应，开发了一种简单准确的络合滴定法。通过pH值的降低来追踪体系中Ca-EDTA络合物的形成和H离子的释放。在滴定的等当点，观察到pH值急剧升高。考虑到该方法的工作pH范围（pH 6.2 - 7.5），通过使用溴百里酚蓝作为pH敏感指示剂，开发了另一种络合滴定法。这是首次使用酸碱指示剂进行络合滴定的报告。