diffusion current

diffusion current

[də′fyü·zhən ‚kər·ənt]
(analytical chemistry)
In polarography with a dropping-mercury electrode, the flow that is controled by the rate of diffusion of the active solution species across the concentration gradient produced by the removal of ions or molecule at the electrode surface.
References in periodicals archive ?
Where ai and aA are the ratios of diffusion current at concentrations of interfering agent and analyte respectively.
7 nA diffusion current at -417 mV and another run an aliquot of digested sample results into 47.
In this method, the diffusion current is proportional to the concentration of the substance, and a change in the concentration to be determined is immediately reflected in the value of diffusion current [4-6].
The diffusion current is proportional to concentration of MTB with plateau potential at -1.
The principle of this method consists of measuring the limiting diffusion current at the cathode of an electrolysis cell during an electrochemical reaction, so as to determine the mass transfer rate.
The most common approaches related to the wall shear stress probes are focused on the research of transfer functions between wall shear stress and limiting diffusion current (Mitchell and Hanratty [38]; Deslouis et al.
alpha]] means a partial density vector of diffusion current, e[rho]--space charge, i--total density of diffusion current.
Taken into consideration is the fact that the changes of the space charge in time are very slow ([delta]e[rho]/[delta]t [congruent to] 0 ) and the sum of the densities of the diffusion currents corresponds to the density of the external current I ([e.
The temperature coefficient values of diffusion current as shown in Table 1 and 2 are found to be between 1.
These criteria are based on the polarographic diffusion current [i.
In all the cases decrease in diffusion current occurred with increasing ligand concentration.
This removes the need to evaluate ionic currents and diffusion currents at millions of sites, and allows the use of a much lower spatial resolution (in the order of 1 mm).

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