Herbicide Residues, Determination of Polychlorinated Benzoic Acid Herbicide Residues by Gas Chromatography

1964 ◽  
Vol 12 (5) ◽  
pp. 468-472 ◽  
Author(s):  
J. J. Kirkland ◽  
H. L. Pease
Keyword(s):  
Gas Chromatography ◽  
Benzoic Acid ◽  
Herbicide Residues ◽  
Residues Determination

Determination of cereal herbicide residues in environmental samples by gas chromatography

1996 ◽  
Vol 754 (1-2) ◽  
pp. 347-365 ◽  
Author(s):  
J.L. Tadeo ◽  
C. Sanchez-Brunete ◽  
A.I. García-Valcarcel ◽  
L. Martínez ◽  
R.A. Pérez
Keyword(s):  
Gas Chromatography ◽  
Environmental Samples ◽  
Herbicide Residues

Gas Chromatographic Measurement of Benzoyl Peroxide (as Benzoic Acid) in Cheese

1974 ◽  
Vol 57 (3) ◽  
pp. 706-709
Author(s):  
Albert B Karasz ◽  
Frank DeCocco ◽  
John J Maxstadt
Keyword(s):  
Gas Chromatography ◽  
Benzoic Acid ◽  
Benzoyl Peroxide ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Ether Extract ◽  
Average Recovery ◽  
Flame Ionization ◽  
Chromatographic Measurement

Abstract Benzoyl peroxide bleach, added to cheese, is estimated by gas chromatographic determination of benzoic acid, its principal reduction product. Copper is added to the acidified ether extract of the cheese to reduce the residual bleach, and solvent partitioning and permanganate treatment are used for purification. The benzoic acid is transferred to chloroform containing lauric acid as an internal standard and determined by flame ionization gas chromatography, with a column containing 5% FFAP + 0.5% H3PO4 on Chromosorb W. The average recovery of added benzoyl peroxide was 82.0% and the standard deviation was 0.0128. The occurrence of benzoic acid of microbial origin in cheese poses a problem in accurately determining added benzoyl peroxide from the benzoic acid found in a sample.

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