The titrimetric determination of beryllium(II) with 1,2-phenylenediamine-N,N,N′,N′-tetraacetic acid

• DOI: 10.1016/s0003-2670(00)80815-6
• Publication Date: 2002-07-25T09:05:34Z
• Authors: Noriyuki Nakasuka; Kaori Takahashi; Motoharu Tanaka
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Beryllium (ca. 10−2−10−4 M) is determined by adding excess of 1,2-phenylenediamine-N,N,N′, N′-tetraacetic acid (PhDTA, H4L) and back-titrating with copper(II); arsenazo-I serves as indicator. Formation constants of BeL and BeHL were determined by potentiometry: log KBeL=6.48±0.02 and log KHBeHL=3.48±0.03 (25°C, I=1 M in NaClO4). Expressions for the titration curve are given together with theoretical errors.