Photochemical complexation titrations with fluorimetric end-points

✍ Scribed by John L. Beck; J.M. Fitzgerald; John A. Bishop

• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 498 KB
• Volume: 51
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(70)80001-0

✦ Synopsis

In previous publicatioI~s work on photochemical titrations 1-4 aad on fluorimetric titrations 5-v has been reported. The present paper discusses a combination of the two methods to permit titrations in which the titrating ion for a fluorimetric displacement reaction is generated in a photochemical decomposition. Both the photolysis and fluorescence excitation are accomplished with a single u.v. source1, a.

]~XPERIMENTAL

Reagents

Reagent-grade chemicals were used without further purificatiort with tile exception of potassium trisoxalatocobalt (III) and sodium perchlorate. Deionizedwater was used throughout the study.

The cobalt(III) oxalate complex was prepared as described by BOOTR 8 and purified". The ultraviolet spectrum of the final product agreed with the values found by COP~STAKE AND UR110. The air-dried solid was stored in brown bottles under refrigeration, since the compound can decompose by both photochemical reaction and a thermal reaction 10.