Date of Award

Summer 1955

Document Type


Degree Name

Master of Science




In this study 1,3-bis-(tris-(hydroxymethyl)-methyl­ amino)-2-prapanol dihydrochloride chelates with calcium, manganous, cobaltous, nickelous, cupric and zinc ions were investigated.

Potentiometric titrations were performed to obtain information about the stability of the chelates formed. Calcium and manganous ions showed little chelating ability. Cobaltous, nickelous, cupric and zinc ions formed stable chelates when the ratio of the chelating agent Concentration to the metal ion concentration was 1:1 or larger.

Job 's method of continuous variations was used for determining the composition of the cupric, nickelous and cobaltous chelates and it was found that these metal ions form a 1:1 chelate with l,3-bis-(tris-(hydroxymethyl)­ methyl amino)-2-propanol dihydrochloride.

Stability constants of cupric, niekelous and cobaltous ion chelates were determined spectrophoto­ metrically. The logarithms of the stability constants for the metal chelates are: Cu(II)- 6.45, Ni(II)- 4.86, and Co(II)- 3.66. This order of stability of the chelates is in agreement with the Irving-Williams stability series based on the central metal ion.

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