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Speciation of platinum by GFAAS using various possibilities of analytical signal enhancement.

Authors
  • Serbin, Rastislav1
  • Bazel, Yaroslav2
  • Ružičková, Silvia3
  • 1 Department of Analytical Chemistry, Faculty of Science, Pavol Jozef Šafárik University, Šrobárova 2, 041 80 Košice, Slovak Republic. Electronic address: [email protected]
  • 2 Department of Analytical Chemistry, Faculty of Science, Pavol Jozef Šafárik University, Šrobárova 2, 041 80 Košice, Slovak Republic.
  • 3 Institute of Recycling Technologies, Faculty of Metallurgy, Technical University of Košice, Letná 9, 042 00 Košice, Slovak Republic.
Type
Published Article
Journal
Talanta
Publication Date
Dec 01, 2017
Volume
175
Pages
46–52
Identifiers
DOI: 10.1016/j.talanta.2017.06.078
PMID: 28842017
Source
Medline
Keywords
License
Unknown

Abstract

A novel method for determination of platinum species by application of graphite furnace atomic absorption spectrometry (GFAAS) was developed. The principle of determination is the formation of platinum ion associates (IA) with SCN- and polymethine basic agent 1,3,3-trimethyl-2-[3-(1,3,3-trimethyl-1,3-dihydroindol-2-yliden)-propyl-1,3-dienyl]-3H-indolium chloride (TTDI), which can then be extracted by various organic solvents. Different options for analytical signal intensification (ultrasonic and microwave energy) were examined. The conditions found for ion associate formation and extraction have enabled the proposing of a new Pt(II) and Pt(IV) speciation process. These species can be reliably determined simultaneously at concentration ratios from 1:5 to 5:1. Moreover, the ion associates of platinum with TTDI can be extracted with toluene up to a volume ratio of aqueous and organic phases of Vaq:Vorg = 50:1. This fact for Pt determination using GFAAS means decreasing the limit of detection (LOD) from 7.1µgL-1 to 0.3µgL-1. The method was applied for Pt determination in a model and in spiked water samples.

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