Photometric analysis of trace amounts of hydrazine with p-dimethylaminobenzaldehyde. Chemical equilibria

1967 ◽  
Vol 45 (22) ◽  
pp. 2813-2819 ◽  
Author(s):  
Donald S. Gamble ◽  
I. Hoffman
Keyword(s):  
Acid Solutions ◽  
Photometric Analysis ◽  
Dimethylamino Group ◽  
Chemical Equilibria ◽  
Aqueous Acid ◽  
Equilibrium Data ◽  
Equilibrium Scheme ◽  
Absorbance Peak

An equilibrium scheme is proposed for aqueous acid solutions containing hydrazine, p-di-methylaminobenzaldehyde and p-dimethylaminobenzaldazine. The quinoidal cation form of the latter has an absorbance peak at 455 mμ, for which [Formula: see text] (±2.1%). In 0.4 m to 1 m H+, 10−5 m benzaldazine is practically all in the quinoidal cation form. The acid attenuation of absorbance at 455 mμ is caused by protonation of the dimethylamino group of unreacted aldehyde. Semiquantitative equilibrium data are presented for the reaction between hydrazine and p-dimethylaminobenzaldehyde.

Photometric analysis of trace amounts of hydrazine with p-dimethylamino benzaldehyde. Chemical equilibria. Part II

1968 ◽  
Vol 46 (8) ◽  
pp. 1365-1371 ◽  
Author(s):  
Donald S. Gamble
Keyword(s):  
Aqueous Solutions ◽  
Equilibrium Constant ◽  
Chemical Equilibrium ◽  
Experimental Error ◽  
Photometric Measurement ◽  
Hydrazine Sulfate ◽  
Photometric Analysis ◽  
Thermodynamic Equilibrium Constant ◽  
Chemical Equilibria ◽  
Equilibrium Data

Additional chemical equilibrium data are presented for aqueous solutions into which have been put p-dimethylaminobenzaldehyde, HCl, and hydrazine sulfate. The photometric measurement of the thermodynamic equilibrium constant for p-dimethylaminobenzaldehyde protonation agrees to within experimental error with the value from solubility experiments. The average of the two is [Formula: see text].Some analytical chemical applications are discussed.

scholarly journals Voltammetric oxidation of dipyridamole in aqueous acid solutions

2000 ◽  
Vol 11 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Marilza Castilho ◽  
Luiz E. Almeida ◽  
Marcel Tabak ◽  
Luiz H. Mazo
Keyword(s):  
Acid Solutions ◽  
Aqueous Acid

The Dissolution Kinetics of Lithiated NiO in Aqueous Acid Solutions

1975 ◽  
pp. 489-499 ◽  
Author(s):  
Chin-Ho Lee ◽  
Alan Riga ◽  
Ernest Yeager
Keyword(s):  
Dissolution Kinetics ◽  
Acid Solutions ◽  
Aqueous Acid ◽  
Kinetics Of

Electrolytic hydrogenation of phenols in aqueous acid solutions

1983 ◽  
Vol 28 (5) ◽  
pp. 671-674 ◽  
Author(s):  
Kazuo Sasaki ◽  
Atsutaka Kunai ◽  
Junji Harada ◽  
Sinsuke Nakabori
Keyword(s):  
Acid Solutions ◽  
Aqueous Acid ◽  
Electrolytic Hydrogenation

A new form of hydroxyaluminum phthalocyanine by acid treatment. Characterization and photoactivity

1988 ◽  
Vol 66 (7) ◽  
pp. 1609-1616 ◽  
Author(s):  
LÊ H. Dao ◽  
Gérard Perrier ◽  
Kenneth Cole
Keyword(s):  
Acid Treatment ◽  
Near Infrared ◽  
Absorption Spectrometry ◽  
Acid Solutions ◽  
Solar Cell Device ◽  
Visible Absorption ◽  
X Ray ◽  
Photoelectrochemical Solar Cell ◽  
Aqueous Acid ◽  
New Form

A new polymorph of hydroxyaluminum phthalocyanine (PcAlOH) was obtained when PcAlOH thin film was exposed to aqueous acid solutions. The new polymorph, which is characterized by infrared, near-infrared, and visible absorption spectrometry and X-ray diffractometry, shows enhanced photoactivity in a photoelectrochemical solar cell device.

Ion-Exchange Paper—X-Ray Emission Procedure for Determination of Microgram Quantities of Mercury

1964 ◽  
Vol 47 (2) ◽  
pp. 391-394
Author(s):  
William B Link ◽  
Keith S Heine ◽  
J H Jones ◽  
Percy Wattlington
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Emission Spectroscopy ◽  
Barium Sulfate ◽  
Magnesium Stearate ◽  
Magnesium Carbonate ◽  
Acid Solutions ◽  
X Ray ◽  
Aqueous Acid

Abstract A method has been developed for determining 1 μg of mercury in 100 ml of aqueous acid solution with a precision of ± 0.25 μg. In the method, the mercury is adsorbed by anion resinloaded paper and determined by X-ray emission spectroscopy. The method gave 75—125% recoveries of 1 μg of mercury from acid solutions containing 10 g of sodium sulfate, sodium chloride, iron oxide, magnesium carbonate, and calcium carbonate, and satisfactory recoveries from the HCl extract of carbon, barium sulfate, chromic oxide, bentonite, kaolin, talc, titanium dioxide, and magnesium stearate. Substantial changes in flow rate or acid concentration seem to have little effect on mercury absorption from HC1 solution. Mercury in zinc oxide or bismuth oxychloride cannot be determined by this technique.

Electrochemical properties of poly-ortho-aminophenol modified electrodes in aqueous acid solutions

1990 ◽  
Vol 291 (1-2) ◽  
pp. 81-101 ◽  
Author(s):  
Cesar Barbero ◽  
Juana J. Silber ◽  
Leonides Sereno
Keyword(s):  
Electrochemical Properties ◽  
Modified Electrodes ◽  
Acid Solutions ◽  
Aqueous Acid
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