Naslov
Spectrophotometric Study of Osmium-Thiocyanato Complexes in the Presence of Surfactants

Autori
Rožmarić Mačefat, Martina ; Gojmerac Ivšić, Astrid

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
European Conference on Analytical Chemistry Euroanalysis 13 "The Role of Analytical Chemistry in the Protection of the Citizens" : Abstracts of the Scientific Contributions PS2 / - Salamanca, 2004, 266-266

Skup
European Conference on Analytical Chemistry Euroanalysis 13 "The Role of Analytical Chemistry in the Protection of the Citizens"

Mjesto i datum
Salamanca, Španjolska, 05.09.2004. - 10.09.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
extraction; hexadecylpyridinium chloride (CPC); osmium; spectrophotometry; thiocyanate; Triton X-100

Sažetak
An aqueous solution of the nonionic surfactant Triton X-100, when heated above the cloud-point temperature, exhibits the property of separating into an aqueous phase and a surfactant-reach phase. This phase-separation phenomenon can be used for extraction of metal complexes. In order to throw more light on the influence of surfactants on the spectrophotometric properties of metal complexes we have studied the extraction of osmium thiocyanate. When an acidic aqueous solution of osmium(VIII) containing thiocyanate ions was heated, an orange-yellow complex was formed. The complex could be extracted as ion-pair with cetylpyridinium chloride (CPC) to chloroform as well as in the surfactant-reach phase of Triton X-100. In view of good reducing properties of thiocyanate, the reduction of osmium(VIII) with excess of thiocyanate by heating, was taken in to account. The extracted osmium– thiocyanato complex had maximum absorption at 445 nm and followed Beer´s law in the range of 2´10-5 - 1.2´10-4 M osmium(VIII). The respective molar absorptivities depended on extraction conditions. The results of investigation of the surfactant-extraction system of the osmium-thiocyanato complex in Triton X-100 were compared with those obtained in the usual liquid-liquid extraction system using chloroform as organic solvent.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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