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Ultra-high-sensitive extraction-photometric determination of sodium ion using flow injection analysis with a chromogenic calix[4]arene derivative and a laser interferometric photothermal detector.
Anal Chem
April 2012
Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, Wakayama, Japan.
A novel flow injection analysis (FIA) system for ultra-high-sensitive determination of Na(+), which involves laser interferometric photothermal equipment as the detector, was designed using a proton-dissociable chromogenic calix[4]arene derivative with a dinitrophenol moiety as the extraction-photometric reagent. The chromogenic calix[4]arene derivative showed an excellent extractability toward Na(+), which reflected the cation-complexing property of the tetraethyl ester derivative of calix[4]arene. As the calibration graph of the Na(+) concentration could be successfully obtained at the nanomolar level by this method, the proposed FIA system was found to be promising for highly sensitive determination of Na(+) in very dilute samples such as supply water and cooling water in power plants.
View Article and Find Full Text PDFThe extraction of aromatic carboxylic acids by the copper complex with Curtis macrocyclic tetramine and its utilization for photometric determination of nonsteroidal anti-inflammatory drugs.
Acta Pol Pharm
October 2011
A.V. Bogatsky Physico-chemical Institute of the National Academy of Sciences of Ukraine. 86, Lustdorfskaja doroga 65080, Odessa, Ukraine.
Copper complex with Curtis macrocyclic tetramine is offered as reagent for extraction-photometric determination of nonsteroidal anti-inflammatory drugs (NSAIDs), belonging to the class of aromatic carboxylic acids. The studies indicate that this method is suitable for quantitative determination of NSAIDs, which have the constant distribution in the system chloroform/water (log P) no less than 3 and dissolubility in chloroform (S) no less than 10 mg/mL. Under optimum conditions, there are liner relationships between the absorption of chloroform extracts and concentration of NSAID in the range of 0.
View Article and Find Full Text PDFExtraction photometric determination of yperite by phthaleins.
Talanta
January 1999
Department of Chemistry, Military University, 682 03 Vyskov, Czech Republic.
Extraction spectrophotometric determination of sulfidic yperite, based on the reaction with four phthaleins, was developed. The method is technically simpler than the determination of yperites with reagent T-135 (alkaline-aqueous ethanolic thymolphthalein solution) because it does not require heating at 80 degrees C, cooling and acidification of the reaction mixture. Selection of the appropriate phthalein, and particularly optimization of the reagent composition and extraction of the coloured reaction product in chloroform, markedly increased the selectivity of the determination of yperites (HD, HN-3).
View Article and Find Full Text PDF[Qualitative and quantitative analysis of ammonium salts of hexamethylenetetramine and 1,10-phenanthroline].
Medicina (Kaunas)
March 2008
Department of Pharmaceutical Chemistry and Pharmacognosy, Kaunas University of Medicine, Kaunas, Lithuania.
By use of chemical and physicochemical methods the qualitative and quantitative analysis of bacteriostatic agents N-carbamoylmethylhexamethylenetetraamonium chloride (U-77) and 1-propyl-1,10-phenanthrolinium iodide (X-50) was carried out. The color reactions of these salts with various agents, e. g.
View Article and Find Full Text PDF[Determination of manganese in ore by extraction-photometric method of I2-CCl4 with ammonium peroxodisulfate as oxidizer].
Guang Pu Xue Yu Guang Pu Fen Xi
December 2002
Huizhou University of Guangdong, Huizhou 516015, China.
Ore samples were resolved by ammonium peroxodisulfate, and Mn (II) contained in the samples was oxygenated into Mn (VII), which in turn reacted on KI, separating out I2. According to the above experiment, manganese was then determined indirectly by the use of extraction photometric method of I2-CCL4 and satisfactory results have been obtained. When manganese content is between 0.
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