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Determination of Thallium Traces from Aqueous Solutions Using Iron(III) Hexamethylenedithiocarbamate as a Flotation Collector and Subsequent Electrothermal Atomic Absorption Spectrometry

Gorica Pavlovska ; Institute of Chemistry, Faculty of Natural Sciences and Mathematics, St. Cyril and Methodius University, Skopje, Macedonia
Katarina Čundeva ; Institute of Chemistry, Faculty of Natural Sciences and Mathematics, St. Cyril and Methodius University, Skopje, Macedonia
Trajče Stafilov orcid id orcid.org/0000-0002-9017-6768 ; Institute of Chemistry, Faculty of Natural Sciences and Mathematics, St. Cyril and Methodius University, Skopje, Macedonia


Puni tekst: engleski pdf 193 Kb

str. 121-134

preuzimanja: 209

citiraj


Sažetak

Hexamethyleneammonium hexamethylenedithiocarbamate (HMA-HMDTC) was used as a new flotation reagent for enrichment and separation of thallium traces from aqueous Solutions. HMA-HMDTC added to the first precipitate collector of hydrated iron(III) oxide (Fe2O3xH2O) gives the second precipitate collector of iron(III) hexamethylenedithiocarbamate (Fe(HMDTC)3). During the coprecipitation step, thallium ions are incorporated in the structure of the collector particles forming a sublate, which is separated from the processed water phase by flotation. After the preconcentration and separation step, a quantitative analysis is performed by electrothermal atomic absorption spectrometry (ETAAS). The diverse experimental parameters affecting the flotation efficiency were determined and optimized. It was ascertained by a proposed procedure that total thallium can be separated quantitatively by addition of 10 mg FeIII and 3 mL 0.1 mol/L HMDTC- to the sample at pH = 6.0. The applicability of the proposed new procedure has been verified by the analysis of natural water samples by the method of standard additions and by inductively coupled plasma - atomic emission spectrometry (ICP-AES), as an independent comparative method. The limit of detection for thallium in this method is 0.024 μg/L.

Ključne riječi

thallium, enrichment, flotation, determination, electrothermal atomic absorption spectrometry

Hrčak ID:

131782

URI

https://hrcak.srce.hr/131782

Posjeta: 359 *