Colorimetric Determination of Boron in Aqueous Solutions and in Borosilicate Glass by Solvent Extraction

1973 ◽  
Vol 120 (9) ◽  
pp. 1284 ◽  
Author(s):  
A. S. Tenney
Keyword(s):  
Solvent Extraction ◽  
Aqueous Solutions ◽  
Borosilicate Glass ◽  
Colorimetric Determination

Rapid Colorimetric Assay of Trimethoprim and Sulfamethoxazole in Pharmaceuticals

1983 ◽  
Vol 66 (6) ◽  
pp. 1447-1449 ◽  
Author(s):  
Asis K Sanyal ◽  
Dinabandhu Laha
Keyword(s):  
Solvent Extraction ◽  
Colorimetric Assay ◽  
Pharmaceutical Preparations ◽  
Ion Pair ◽  
Pair Formation ◽  
Bromophenol Blue ◽  
Colorimetric Determination ◽  
Ion Pair Formation ◽  
Subsequent Measurement

Abstract A method is described for the direct colorimetric determination of trimethoprim and sulfamethoxazole in pharmaceutical preparations, without prior separation. Estimation of trimethoprim is based on its ion-pair formation with bromophenol blue and subsequent measurement of absorbance of the ionpair at 418 nm. Estimation of sulfamethoxazole is possible without removal of trimethoprim by solvent extraction.

scholarly journals A New Method for the Colorimetric Determination of Acrinol Base by Solvent Extraction with Tetrabromophenolphthalein Ethyl Ester

1971 ◽  
Vol 19 (6) ◽  
pp. 1280-1284
Author(s):  
MASAHIRO TSUBOUCHI ◽  
YUROKU YAMAMOTO
Keyword(s):  
Solvent Extraction ◽  
Ethyl Ester ◽  
New Method ◽  
Colorimetric Determination

scholarly journals A New Colorimetric Determination of Iodide Ions by Solvent Extraction with the 1,10-Phenanthroline-Iron(II) Complex

1964 ◽  
Vol 37 (3) ◽  
pp. 434-435 ◽  
Author(s):  
Yuroku Yamamoto ◽  
Seiichiro Kinuwaki
Keyword(s):  
Solvent Extraction ◽  
Colorimetric Determination ◽  
Iodide Ions

scholarly journals Analytical Microsystem for the Monitoring and Analysis of Cobalt in Aqueous Solutions Using LTCC Technology

2017 ◽  
Vol 58 (4) ◽  
Author(s):  
Olga Natalia Bustos López ◽  
Francisco Valdés Perezgasga ◽  
Héctor Aurelio Moreno Casillas ◽  
Julián Alonso Chamarro ◽  
Hesner Coto Fuentes
Keyword(s):  
Aqueous Solutions ◽  
Continuous Flow ◽  
Flow System ◽  
Detection System ◽  
Light Emitting Diode ◽  
Colorimetric Determination ◽  
Light Emitting ◽  
Design And Implementation ◽  
Optical Detection System

<p>This work is focused on the design and implementation of a microsystem for continuous colorimetric determination of cobalt in aqueous solutions in real time.  The main goal is the colorimetric determination of cobalt by adapting colorimetric methodologies used in discontinuous analysis systems to a continuous flow system and its subsequent miniaturization using the LTCC (Low Temperature Co-fired Ceramics) technology. The measure absorbance was recorded using an optical detection system based on a LED (Light Emitting Diode) with a wavelength of 540 nm. </p>

PERIODATE–PERMANGANATE OXIDATIONS: III. DETERMINATION OF ISOPROPYLIDENE GROUPS

1955 ◽  
Vol 33 (11) ◽  
pp. 1714-1719 ◽  
Author(s):  
E. Von Rudloff
Keyword(s):  
Aqueous Solutions ◽  
Quantitative Yield ◽  
Simultaneous Estimation ◽  
Colorimetric Determination ◽  
Double Bonds ◽  
Methylene Groups ◽  
Insoluble Compounds

The reaction of the periodate–permanganate reagent with olefinic double bonds was applied to the determination of isopropylidene groups. The oxidation of compounds containing such groups gave a quantitative yield of acetone which could be readily determined by known iodometric and colorimetric procedures. Use of aqueous solutions of pyridine or dioxane as solvent permitted analysis of water-insoluble compounds. The colorimetric determination of acetone was then preferred. This method also allowed a simultaneous estimation of terminal methylene groups. The content of isopropylidene groups of commercial samples of three terpenes of the geraniol type was determined.

scholarly journals A New Colorimetric Determination of Nitrate Ions by Solvent Extraction with Crystal Violet

1964 ◽  
Vol 37 (11) ◽  
pp. 1718-1719 ◽  
Author(s):  
Yuroku Yamamoto ◽  
Sumio Uchikawa ◽  
Kozo Akabori
Keyword(s):  
Solvent Extraction ◽  
Crystal Violet ◽  
Colorimetric Determination ◽  
Nitrate Ions
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