scholarly journals Raman and Mossbauer analysis of the intermediate products formed during gold-bearing pyrite biooxidation by moderately thermophilc bacteria

2016 ◽  
Author(s):  
Chang-Li Liang ◽  
Wen-Qing Qin ◽  
Jing-He Chen ◽  
Shui-Ping Zhong ◽  
Hang-Qu Yang
Keyword(s):  
Intermediate Products ◽  
Mössbauer Analysis ◽  
Gold Bearing

JURASSIC FAULTS ALONG THE MARGIN OF LAURASIA: PRINCIPAL CONDUITS FOR GOLD-BEARING FLUIDS

2017 ◽  
Author(s):  
Thomas H. Anderson ◽  
◽  
Amabel Ortega-Rivera ◽  
J.L. Rodríguez-Castaneda
Keyword(s):  
Gold Bearing

The Use of Piezosensors for Determination of Carboxylic Acids in the Intermediate Products of Edible Ethanol Production

2020 ◽  
Vol 56 (14) ◽  
pp. 1379-1383
Author(s):  
Cao Nhat Linh ◽  
O. V. Duvanova ◽  
S. Yu. Nikitina ◽  
A. N. Zyablov
Keyword(s):  
Ethanol Production ◽  
Carboxylic Acids ◽  
Intermediate Products

Polarographic reduction of α-(4-ethylbenzoyl)-α,β-dibromopropionic acid on mercury dropping electrode

1979 ◽  
Vol 44 (4) ◽  
pp. 1318-1323
Author(s):  
Miloslava Počtová
Keyword(s):  
Electrochemical Reduction ◽  
Carbonyl Group ◽  
Polarographic Reduction ◽  
Polarographic Wave ◽  
Intermediate Products ◽  
Active Intermediate

A mechanism of the electrochemical reduction of β-(4-ethylbenzoyl)-α,β-dibromopropionic acid is suggested based on the results of classical polarography and polarography with Kalousek's switch and on the identification of the polarographically active intermediate products. The substance converts to β-4-ethylbenzoylacrylic acid on the electrochemical elimination of the bromine atoms, and the latter acid is reduced further to β-4-ethylbenzoylpropionic acid. The most negative polarographic wave corresponds to the reduction of the carbonyl group in the benzoyl part of the last acid.

Oxidation scheme of symmetrically disulphonated naphthidines with cerium(IV) sulphate

1981 ◽  
Vol 46 (3) ◽  
pp. 561-572 ◽  
Author(s):  
Karel Komers
Keyword(s):  
Sulphuric Acid ◽  
Rate Constants ◽  
Oxidation Product ◽  
Side Reaction ◽  
Reaction Scheme ◽  
Second Order ◽  
Intermediate Products ◽  
Stable Intermediate ◽  
Starting Compound ◽  
Oxidation Agent

The author derived theoretical dependences of preasymptotic slopes of the currentless E-t curves (potential of an indicator redox electrode against time) on the number of equivalents, n, of added oxidation agent, assuming a reaction scheme of two consecutive concurrent second-order reactions involving the formation of intermediate products ( a side reaction of the starting compound with the final oxidation product leading to an adduct, which undergoes consecutive bimolecular oxidations leading again to the final product). The dependences enable to determine the type of the relatively stable intermediate products and the ratios of the rate constants. The theory was applied to the oxidation of four symmetrically disulphonated naphthidines with cerium(IV) sulphate in aqueous sulphuric acid and the results were substantiated spectrophotometrically

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