Electrochemical gravimetric

Fu-Ren, F. and Bard, A. (2002) Chemical, electrochemical gravimetric and microscopic studies on antimicrobial silver films. Journal of Physical Chemistry, 106, 279-87. 

A gravimetric method in which the signal is the mass of an electrodeposit on the cathode or anode in an electrochemical cell. 

Coulometric methods are as accurate and precise as conventional gravimetric and volumetric procedures and, in addition, are readily automated. In contrast to gravimetric methods, coulometric procedures are usually rapid, and do not require that the product of the electrochemical reaction be a weighable solid. The methods are moderately sensitive, and offer a reasonably selective means for separating and determining a number of ions. 

In chemical analysis, we encounter solubility in precipitation titrations, electrochemical reference cells, and gravimetric analysis. The effect of acid on the solubility of minerals and the effect of atmospheric COz on the solubility (and death) of coral reefs are important in environmental science. 

A historically important form of gravimetric analysis was combustion analysis, used to determine the carbon and hydrogen content of organic compounds burned in excess 02 (Figure 27-4). Instead of weighing combustion products, modem instruments use thermal conductivity, infrared absorption, or coulometiy (with electrochemically generated reagents) to measure the products. 

Schultze, J.W., Khan, W., Woolfaardt, G.M., Rohns, H.-P., Irmscher, R. and Schoening, J. (2003) High resolution gravimetric, optical and electrochemical investigations of microbial biofilm formation in aqueous systems. Electrochim. Acta 48, 3363-3372. 

Internal electrolysis — Internal electrolysis, also known as spontaneous electrogravimetric analysis, is the deposition of a metal in an electrochemical cell for the purpose of gravimetric analysis without an external source of electrical energy by proper selection of the anode material. For example Ag can be determined in the presence of Pb, Cu, and Bi by use of a Cu anode. (See also electrogravimetry). 

The solution was standardized, either gravimetrically as silver bromide, or by titration with sodium hydroxide to a phenolphthalein end point. Such hydrobromic acid has been sufficiently pure for accurate electrochemical measurements (9). 

Figure 9.23 Thermal gravimetric analyzer (TGA) decomposition of electrochemically generated alane, releases almost full H2 capacity expected in AIH3, Ref [55],...

Electrode potential The potential of an electrochemical cell in which the electrode of interest is the right-hand electrode and the standard hydrogen electrode is the left-hand electrode. Electrogravimetrlc analysis A branch of gravimetric analysis that involves measuring the mass of species deposited on an electrode of an electrochemical cell. 

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