OH-Radical Induced Oxidation of Phenoxyacetic Acid and 2,4-Dichlorophenoxyacetic Acid. Primary Radical Steps and Products

2002 ◽  
Vol 106 (29) ◽  
pp. 6743-6749 ◽  
Author(s):  
Robert Zona ◽  
Sonja Solar ◽  
Knud Sehested ◽  
Jerzy Holcman ◽  
Stephen P. Mezyk
Keyword(s):  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Oh Radical ◽  
Primary Radical ◽  
2,4 Dichlorophenoxyacetic Acid

Adsorption of 2,4-Dichlorophenoxyacetic Acid and Phenoxyacetic Acid on Sibunit

2018 ◽  
Vol 52 (1) ◽  
pp. 53-57 ◽  
Author(s):  
M. D. Vedenyapina ◽  
L. R. Sharifullina ◽  
S. A. Kulaishin ◽  
E. D. Strel’tsova ◽  
A. A. Vedenyapin ◽  
...  
Keyword(s):  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

scholarly journals Preparation, Analytical, IR Spectral, and Thermal Studies of Some New Hydrazinium Carboxylates

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
R. Manimekalai ◽  
C. R. Sinduja ◽  
K. Kalpanadevi
Keyword(s):  
Thermal Decomposition ◽  
Ir Spectra ◽  
Cinnamic Acid ◽  
Thermal Studies ◽  
Carbon Residue ◽  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Diphenylacetic Acid ◽  
Hydrazinium Salts ◽  
2,4 Dichlorophenoxyacetic Acid

Hydrazinium salts of 2,4-dichlorophenylacetic acid, phenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, diphenylacetic acid, cinnamic acid, and picolinic and nicotinic acids have been prepared by accomplishing neutralization of aqueous hydrazine hydrate with the respective acids. Formation of these hydrazinium salts has been confirmed by analytical, IR spectral, and thermal studies. IR spectra of the salts register N–N stretching frequencies of ion in the region 963–951 cm−1 and the frequencies of ion in the region 1047–1026 cm−1. Thermal decomposition studies show that the hydrazinium salts undergo melting followed by endothermic decomposition into carbon residue as the endproduct.

SOME MORPHOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF A SOIL BACTERIUM WHICH DECOMPOSES 2,4-DICHLOROPHENOXYACETIC ACID

1957 ◽  
Vol 3 (6) ◽  
pp. 821-840 ◽  
Author(s):  
G. R. Bell
Keyword(s):  
Yeast Extract ◽  
Tricarboxylic Acid Cycle ◽  
Maximum Growth ◽  
Cell Multiplication ◽  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Resting Cells ◽  
Mineral Salts ◽  
Chlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

A new Achromobacter species which decomposed 2,4-dichlorophenoxyacetic acid (2,4-D), apparently to small molecules, was isolated from a soil treated with successive closes of the herbicide. The organism grew poorly or not at all on common laboratory media in the presence or absence of 2,4-D. Investigation of its carbon, nitrogen, mineral, and vitamin requirements in agar containing 2,4-D showed that the best growth stimulants were the dicarboxylic acids of the tricarboxylic acid cycle, bicarbonate, formate, urea, and L-histidine. Calcium or magnesium and probably iron were required for maximum growth. Some aryloxy acids, phenolic compounds, and an ester were tested for their ability to replace 2,4-D as growth substrate or to inhibit growth in the presence of 2, 4-D, and it was found that the ethyl ester of 2,4-D and chlorophenolic substances were most toxic. Only 2-methyl-4-chlorophenoxyacetic acid (MCPA) and less readily, 4-chlorophenoxyacetic acid, phenoxyacetic acid, and resorcinol could substitute for 2,4-D. Good cell multiplication and herbicide decomposition were obtained in an aerated mineral salts medium containing 2,4-D, yeast extract, and 0.005 ML-malic acid. Maximum growth (ca. 109cells/ml.) occurred in 4 to 5 days and 2,4-D decomposition was essentially complete in 6 to 7 days. Resting cells were able to oxidize 2,4-D, MCPA, 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), and 2,4-dichlorophenol (2,4-DCP) and to release 94% of the 2,4-D chlorine as chloride. High concentrations of yeast extract caused growing cells to accumulate 2,4-DCP.

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