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Electrometry

In electroanalysis, the techniques are pre-eminently based on processes that take place when two separate poles, the so-called electrodes, are in contact with a liquid electrolyte, which usually is a solution of the substance to be analysed, the analyte. By means of electrometry, i.e., by measuring the electrochemical phenomena occurring or intentionally generated, one obtains signals from which chemical-analytical data can be derived through calibration. Often electrometry (e.g., potentiometry) is applied in order to follow a reaction that goes to completion (e.g., a titration), which essentially represents a stoichiometric method, so that the electrometry merely acts as an end-point indicator of the reaction (which means a potentiometric titration). The electrochemical phenomena in electroanalysis, whether they take place in the solution or at the electrodes, are often complicated and their explanation requires a systematic treatment of electroanalysis. [Pg.20]

When a solid material has been placed in an electrolytic solution a certain electrical potential may be built up at the contact surface however, this single potential cannot be measured in the absolute sense, nor can an electrical current be forced through the electrode without the aid of a second electrode. Therefore, electrometry in an electrolyte always requires two electrodes, the poles or terminals of the electroanalytical cell, and can be carried out by means of either non-faradaic or faradaic methods. [Pg.21]

Excess pyridine, iodine, and methanol are required for quantitative consumption of water. Sulfur dioxide reduces iodine quantitatively in the presence of excess water. The excess iodine present in the mixt makes a visual detn of the end point difficult. Therefore, the endpoint can be detnd electrometri-... [Pg.516]

Early work demonstrated the use of enzymes coupled to antibodies or antigens as reagents in immunoassay. Enzyme activity can be measured in a variety of ways, each with certain advantages, which makes a variety of enzymes good labeling substances. Most assay methods are based on spectroscopic properties derived from an enzymatically transformed substrate. These methods are colorimetry, flurorometry, luminometry, and electrometry. [Pg.2051]

The concentrations, in mmol/1, of different components were checked by classical, visible (VIS) spectrophotometry, ion-selective electrometry, atomic absorption spectrometry, continuous flow and flame photome-... [Pg.34]

Thermo-electrometry is a group of thermo-analytical techniques in which an electrical property of a sample is monitored as a function of the temperature or time. An electrical property is seen as the response of a polymer when an electric field is applied to it. In contrast to metals, where electronic conduction is the only response to an electrical field, polymers may respond in different ways. A review of the different possibilities is given recently by C.C. Ku and R. Liepins in their "Electrical properties of polymers chemical principles [1]. Ku and Liepins separate the response of polymers to an electric field into two main parts ... [Pg.123]

Two independent experimental techniques (electrometry or pulse counting) were used to measure the enthalpy change of the first reaction and only electrometry for the second reaction, leading to averaged enthalpy of reaction values of (134+ 10) kJ-moP and (333 8) kJ-mol, respectively. Using these values, and literature values for Af//" of Zr(s), 1(g) and Zrl4(g), a value of-(130 8) kJ-moP was calculated for the enthalpy of formation of Zrl3(g). [Pg.320]

Yu. E. Danilova, Localization of Optical Excitations in Colloidal Silver Aggregates PhD Thesis (Institute of Automatics and Electrometry RAS, Novosibirsk, 1999). [Pg.306]

Novosibirsk Institute of Organic Chemistry SB RAS, Novosibirsk, institute of Automation and Electrometry SB RAS, Novosibirsk,... [Pg.317]

ISO 3839-96. Petroleum produets - Determination of bromine number of distillates and aliphatic olefins -Electrometrie method. [Pg.1071]

The H-ion concentration of urine may be determined electrometrieally or colorimetrically by means of selected indicators covering the range... [Pg.393]


See other pages where Electrometry is mentioned: [Pg.127]    [Pg.316]    [Pg.305]    [Pg.340]    [Pg.188]    [Pg.189]    [Pg.512]    [Pg.3]    [Pg.698]    [Pg.1]    [Pg.5]    [Pg.123]    [Pg.405]    [Pg.1361]    [Pg.209]    [Pg.41]    [Pg.427]    [Pg.748]    [Pg.748]    [Pg.762]    [Pg.219]    [Pg.39]    [Pg.381]   
See also in sourсe #XX -- [ Pg.828 , Pg.836 ]




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Thermo electrometry

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