Determination of thallium in rock and soil samples

A new simple, highly sensitive and selective spectrofluorimetric method for the speciation of thallium at pico-trace levels in various complex matrices usingN-(pyridin-2-yl)-quinoline-2-carbothioamide

“…It has also been found superior to existing spectrouorimetric methods reported in the literature. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]…”

“…Many methods have been proposed for the determination of thallium and its speciation in environmental, biological, and soil samples, which includes inductively coupled plasma mass spectrometry (ICP-MS), 12,13 ICP-OES, [14][15][16] ame atomic absorption spectrophotometry (AAS), 17 electrothermal atomic absorption spectrophotometry (EAAS), 18 HPLC, 19 spectrophotometry, 20 differential-pulse anodic stripping voltammetry (DPASV), 21 and spectrouorimetry. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] ICP-MS and ICP-OES, being highly expensive, are not used for routine analysis in developing countries such as Bangladesh. AAS is sensitive but suffers from sample matrix interferences, such as salinity.…”

“…[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] Several authors have reported on the extractive spectrouorimetric determination for speciation of thallium using complexes formed via a variety of reagents. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] In most of the methods [25][26][27][30][31][32][33] cited in the literature, as shown in Table 1, thallium forms soluble or insoluble complexes with those reagents with various organic solvents for the spectro-uorimetric determination of thallium. Most of these reagents are expensive and non-recoverable, and most of the organic solvents used are carcinogenic according to EPA.…”