A highly sensitive and selective spectrofluorimetric method for the determination of cerium at pico-trace levels in some real, environmental, biological, soil, food and bone samples using 2-(α-pyridyl)-thioquinaldinamide

Abstract

A very simple, ultra-sensitive and highly selective non-extractive new spectrofluorimetric method is presented for the determination of cerium at pico-trace levels using 2-(α-pyridyl)-thioquinaldinamide (PTQA).

Development of a new highly sensitive and selective spectrophotometric method for the determination of selenium at nano-trace levels in various complex matrices using salicylaldehyde-orthoaminophenol

“…Therefore, this method will be successfully applied to the routine monitoring of trace and ultra-trace amounts of selenium in real, environmental, biological, soil, food and pharmaceutical samples. It is a new method needs neither heating nor extraction to organic phase, works satisfactorily and could be an alternative method for the rapid determination of selenium in a wide variety of sample solutions and found superior to spectrophotometric methods described in different literature [73][74][75][76][77][78][79][80][81][82].…”

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

“…PQCTA has been reported as a spectrouorimetric reagent but, to our knowledge, it has not been used previously for the simultaneous determination of Tl I and Tl III in a uorescence system. The method possesses distinct advantages over existing methods, [25][26][27][28][29][30][31][32][44][45][46][47][48][49] as shown in Table 1, with respect to several analytical parameters (Table 1). The method is based on the oxidative reaction of non-uorescent PQCTA in a slightly acidic (0.0025-0.05 M H 2 SO 4 ) solution with Tl III in the presence of ethanol to produce a highly uorescent oxidized product, followed by the direct measurement of the uorescence intensity in an aqueous solution at room temperature.…”

“…N-(Pyridin-2-yl)-quinoline-2-carbothioamide (PQCTA, C 15 H 11 N 3 S) (molecular wt ¼ 265.28) was synthesized according to the method of Ahmed et al 46 The reagent (PQCTA) was characterized according to the method of Ahmed et al 48 by the melting point analysis, elemental analysis, FTIR and 1 H NMR spectroscopy, and thermo gravimetric analysis. The reagent solution was prepared by dissolving the requisite amount (0.0026 g) of PQCTA in a known volume (10 mL) of absolute ethanol.…”

Design and construction of an electrochemical sensor for the determination of cerium(iii) ions in petroleum water samples based on a Schiff base-carbon nanotube as an ionophore

“…Humans exposed to cerium inhalation have reported heightened sensitivity to heat, itching, and a greater sense of odour and taste. 4 The growing use of cerium in industry, as well as reports of cerium toxicity, necessitate the development of analytical techniques for monitoring cerium in the environment. 4 Many analytical techniques, such as neutron activation analysis, 5 inductively coupled plasma atomic emission spectrometry (ICP-AES), 6 and even traditional spectroscopic and uorimetric methods, 7 are strong instruments for the measurement of cerium.…”