Masters Theses

Abstract

"The reduction of Ce(IV) in HC10₄ solutions by four polyaminocarboxylic acids, which are commonly used as chelating agents, has been studied by the stopped-flow technique. The rates of reduction first increase with increasing acidity, reach maxima which are characteristic of the chelating agent and the medium, then progressively decrease with increasing the acid concentration in the media. At their maximum reactivities, trans-1,2-diaminocyclohexane tetraacetic acid (CDTA) shows the highest reductive ability; this is followed by ethylenedinitrilotetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), and finally nitrilotriacetic acid (NTA). The observed maxima can be qualitatively explained in terms of a mechanism which involves unhydrolyzed Ce⁴⁺ species and unprotonated polyaminocarboxylic acids. A comparison with the reactivities observed in H₂SO₄ media [S. B. Hanna, R. K. Hessley, w. H. Webb and w. R. Carroll, Z. Anal. Chem., in press (1971)] is presented and a mechanism for the EDTA oxidation, consistent with salt effects and the activation parameters, is advanced"--Abstract, page ii.

Advisor(s)

Hanna, Samir B.

Committee Member(s)

Carroll, William R.
Bolter, Ernst

Department(s)

Chemistry

Degree Name

M.S. in Chemistry

Sponsor(s)

University of Libya

Publisher

University of Missouri--Rolla

Publication Date

1971

Pagination

vii, 65 pages

Rights

© 1971 Salem Ahmed Attiga, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Complexometric titrationTransition metalsPerchloratesChelates

Thesis Number

T 2555

Print OCLC #

6034150

Electronic OCLC #

872275332

Download

Included in

Chemistry Commons

Share

 
COinS