Hydrogen coulometry

The sample is reduced in a hydrogen stream at 800°C in the presence of a nickel catalyst. The ammonia formed is detected by coulometry and the test sensitivity is on the order of one part per million. 

High pressure Hquid chromatography (qv) (138) and coulometry can be used to detect and quantify anthraquinones and thek derivatives in a hydrogen peroxide process working solution. 

The value of n for the first reduction process was determined as 0.5 by coulometry on a Pt electrode. After exhaustive electrolysis a hydrogen-bonded dimeric species, [PhjAsO -H- OAsPhj] , was isolated (as the perchlorate salt). However, if the electrolysed solution was treated with anhydrous HCIO4, the original polarogram was restored . This is in agreement with reactions 38-40 ... 

After combustion has been carried out in an oxygen-hydrogen flame, the inorganic mineralization products are determined as chloride ions. This can be carried out by a number of different methods, among which micro-coulometry has been proved especially successful. 

In Brewer-Milford-type coulometry, a potential of 0.2-0.3 V (lower than the decomposition potential of iodide solution) is applied between two Pt electrodes. Polarization current is observed until the surface of the cathode is completely covered with hydrogen ... 

Electrochemical studies of C60 powder mixed with Ag in 30% KOH aqueous solution have been claimed to lead to the reversible formation of C60H56 and C60H18 electrochemically for use as a battery [112]. These compounds have not been isolated, but the stoichiometry was inferred by coulometry and elastic recoil detection of hydrogen and carbon [112]. 

The vast majority of controlled-potential electrolyses are carried out using either mercury or platinum working electrodes. Mercury, of course, is primarily useful as a cathode material where it has the powerful advantage of high hydrogen overvoltage the anodic dissolution of mercury limits its use as an electrode in coulometry exactly as in polarography. Mercury cathodes, in addition, have the... 

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