Spectropolarimetric titrimetry was first introduced by Kirschner et al.1,2and has enjoyed considerable recent success. This was due principally to the introduction of several relatively inexpensive photoelectric polarimeters and subsequent improvements in their design and versatility3,4. Fundamental to this technique is the use of a photoelectric polarimeter to monitor the change in optical rotation of the solution as the titration proceeds. Parameters must be selected so that an inflection in the optical rotation occurs in the vicinity of the equivalence point. Spectropolarimetric titrimetry has been applied to acid-base titrations, as well as to different metals systems2. The applications of this technique have been significantly broadened by Pearson et al., who utilized the two chiral and stereospecific amino-polycarboxylic acids (R)-(-)-1,2-propylenediaminetetra-acetic acid,R-(-)PDTA, and (R, R)-(-)-trans-1,2-cyclohexanediaminetetraacetic acid,R, R(-)CDTA, in the volumetric titrimetric analysis of over 40 metals5–14.