Selective detection of carboxylic acids, ureas and phenols and semiquantitative determination of citric acid by capillary solid-state spot-tests

Talanta ◽  
1978 ◽  
Vol 25 (4) ◽  
pp. 235-237 ◽  
Author(s):  
Md.Nayeem Akhtar ◽  
H.S. Rathore ◽  
Momin Qureshi
Keyword(s):  
Citric Acid ◽  
Solid State ◽  
Carboxylic Acids ◽  
Selective Detection ◽  
Semiquantitative Determination ◽  
Spot Tests

Enhancement of carboxylic acid degradation with sulfate radical generated by persulfate activation

2010 ◽  
Vol 61 (5) ◽  
pp. 1221-1226 ◽  
Author(s):  
J. Criquet ◽  
P. Nebout ◽  
N. Karpel Vel Leitner
Keyword(s):  
Aqueous Solution ◽  
Citric Acid ◽  
Carboxylic Acids ◽  
Sulfate Radical ◽  
Acid Degradation ◽  
Competitive Reactions ◽  
Radical Production ◽  
Persulfate Activation ◽  
Kinetics Of

The aim of this work was to investigate the generation of sulfate radical for the removal of two carboxylic acids in aqueous solution: acetic and citric acids. From photochemical and radiolytic processes, kinetics of the degradation of these two carboxylic acids was studied as a function of the pH of the solution. It was shown that the maximum of acetic acid degradation occurred at pH 5. Above this pH, competitive reactions with the carbon mineralized inhibit the reaction of with the solute. In the case of citric acid, pH has only a little effect on the kinetic of citric acid degradation. The determination of mineralization yields shows several differences depending on carboxylic acids and pH. The degradation of both carboxylic acids was also studied in the radiolysis process whether with or without persulfate addition. A comparison of the processes of sulfate radical production is presented.

Selective Determination of Pentafluorobenzyl Ester Derivatives of Carboxylic Acids by GC Using Microwave Plasma and Mass Selective Detection

1991 ◽  
Vol 45 (10) ◽  
pp. 1617-1620 ◽  
Author(s):  
Jeffrey H. Brill ◽  
Bikshandarkoil A. Narayanan ◽  
John P. McCormick
Keyword(s):  
Carboxylic Acids ◽  
Microwave Plasma ◽  
Selective Detection ◽  
Capillary Gc ◽  
Selective Determination ◽  
Fragmentation Behavior ◽  
Microwave Induced Plasma ◽  
Characteristic Fragmentation ◽  
Derivatives Of

A highly selective, sensitive method for determination of carboxylic acids in water has been developed that is based on fluorine-selective gas chromatography (GC) detection of pentafluorobenzyl ester derivatives. The atmospheric-pressure helium microwave-induced plasma detector is well suited for fluorine-specific detection of these derivatives, which were well resolved by capillary GC and displayed a characteristic fragmentation behavior when examined by GC-mass selective detection. For demonstration purposes, a number of carboxylic acids, ranging from C1 to C20, were examined and found to be derivatized with yields greater than 90%, and a sample of creek water was examined for its carboxylic acid content.

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