Using an Indol Derivative as Complexing Agent for Cloud Point Preconcentration and Determination of Magnesium and Silver Ions in Various Samples by Faas

Abstract

A very simple cloud point extraction (CPE) methodology for the preconcentration of trace amounts of silver and magnesium as a prior step for their determination by flame atomic absorption spectrometry (FAAS) has been developed. The method is based on the extraction of silver and magnesium at pH 10 by using non-ionic surfactant Triton X-114 and 4 methyl-3-((1-H-Indol-3-iyl) (phenyl) methyl)) -1-H-Indol (MPBIM) as a complexing agent. Several important variables that affect the CPE efficiency and FAAS signal were investigated and optimized. The calibration curves, using the preconcentration system, were linear in the range of 0.007-0.200 μg mL -1 with a correlation coefficient of 0.999. The lower limits of detection (3s) obtained in the optimal conditions were 1.47 ng mL -1 and 3.00 ng mL -1 for Mg 2+ and Ag + ions, respectively. The relative standard deviation for five replicate determinations of magnesium and silver at 0.133 μg mL -1 concentration level, were 1.17 and 0.97, respectively. The proposed method was successfully applied to the ultra-trace determination of silver and magnesium in various water samples, blood serum, urine, and radiology film samples.

Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

“…Aj postupy prípravy vzoriek krvného séra alebo plazmy často zahŕňajú v prvom kroku vyzrážanie proteínov kyselinou trichlóroctovou, po ktorej nasleduje zriedenie vzoriek deionizovanou vodou 44,51 alebo neutralizácia s využitím NaOH (cit. 50 ). V publikovanej literatúre nie sú zriedkavosťou ani kyslé rozklady s využitím zmesi HNO 3 a HClO 4 (cit.…”

Cloud Point Extraction with Liquid Ion Exchange for Separation and Determination Magnesium (II) as anion

“…The Slope ratio method was applied by a Compact method, and the results were illustrated in figure (12)(13).…”

“…Trace amounts of magnesium and silver were extracted and preconcentrated by used cloud point extraction (CPE) method in the first step and the determination was the second step by flame atomic absorption spectrometry (FAAS), at pH 10 with used to Triton X-114 as a non-ionic surfactant, a complexing agent used (MPBIM) to the determination of silver and magnesium in many urines, water samples, and other blood serum samples. [12] For the measurement of a trace metal ion in various matrices, Triton X-100 was employed as the extractor in the CPE technique, which was used for separation and preconcentration. CPE is one of the "green chemistry" principles that include rushing in the time, low cost and higher preconcentration factors.…”

Untitled

“…During digestion, organic matter is removed or converted into simpler inorganic forms. This is mostly performed using acids, mainly nitric acid in combination with perchloric acid and an external heat source [14][15][16][17][18]; or using a mixture of nitric acid and hydrogen peroxide in closed vessels at elevated pressure and heated by microwave energy [19][20][21][22][23][24]. Digestion can lead to higher contamination rates or analyte loss during pre-treatment step.…”