Determination of the Diffusion Coefficient of Hydrogen in Aqueous Solution Using Single and Double Potential Step Chronoamperometry at a Disk Ultramicroelectrode

1997 ◽  
Vol 69 (11) ◽  
pp. 2063-2069 ◽  
Author(s):  
Julie V. Macpherson ◽  
Patrick R. Unwin
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Potential Step ◽  
Double Potential Step Chronoamperometry

Split-flow Taylor dispersion technique for diffusivity and concentration measurements of hydrazine in aqueous solution

2014 ◽  
Vol 92 (4) ◽  
pp. 279-283
Author(s):  
Kashif I. Choudhry ◽  
Igor M. Svishchev ◽  
Andriy Plugatyr
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Taylor Dispersion ◽  
Alkaline Media ◽  
Monitoring Method ◽  
Flow Monitoring ◽  
Split Flow ◽  
Taylor Dispersion Technique ◽  
Dispersion Technique

A sensitive continuous-flow monitoring method is developed for the determination of the diffusion coefficient and concentration of hydrazine in an aqueous solution. The effect of pH on the diffusion coefficient of hydrazine in water was studied at room temperature using the developed split-flow Taylor dispersion technique. The hydrazine calibration curve was linear in the range of 10−1000 ppb and the limit of quantification was 10 ppb. The results showed that the diffusion coefficient of hydrazine does not change significantly over the pH range of 4.01−8.27 but increases in alkaline media of pH greater than 8.27. This method can be used for accurate determination of hydrazine concentration in aqueous flow systems.

scholarly journals Determination of the Diffusion Coefficient of the Green and Violet Isomers of Cr2(SO4)3 in Aqueous Solution

1994 ◽  
Vol 35 (12) ◽  
pp. 902-909 ◽  
Author(s):  
Karen S. Yoshiki-Gravelsins ◽  
Tetsuji Hirato ◽  
Yasuhiro Awakura ◽  
Hiroshi Majima
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient

Investigation of molecular partitioning between non polar oil droplets and aqueous solution using double potential step chronoamperometry

2014 ◽  
Vol 16 (22) ◽  
pp. 10456-10463 ◽  
Author(s):  
Jonathan C. Newland ◽  
Patrick R. Unwin ◽  
Julie V. Macpherson
Keyword(s):  
Aqueous Solution ◽  
Oil Droplets ◽  
Factors Affecting ◽  
Potential Step ◽  
Solid Interface ◽  
Oil Water ◽  
Polar Oil ◽  
Double Potential Step Chronoamperometry

Factors affecting partitioning of an electrogenerated species, Br2 from Br−, into non-polar oil microdroplets at the oil–water–solid interface are investigated using double potential step chronoamperometry.

THE POLAROGRAPHY OF THE MAGNESIUM-ALIZARIN SYSTEM

1963 ◽  
Vol 41 (7) ◽  
pp. 1695-1702 ◽  
Author(s):  
D. G. Brewer ◽  
John A. Page
Keyword(s):  
Aqueous Solution ◽  
Diffusion Coefficient ◽  
Ammonium Chloride ◽  
Polarographic Determination ◽  
Reduction Wave ◽  
Soluble Complex ◽  
Reversible Process ◽  
Complex Species ◽  
Polarographic Wave

The polarography of alizarin alone, and alizarin in the presence of magnesium, has been studied in an ammonia–ammonium chloride electrolyte. Alizarin was found to give a reduction wave with E1/2 = −(0.14 + 0.059 pH) volts vs. S.C.E. and a polarographic diffusion coefficient D, equal to 1.20 × 10−6 cm2 sec−1 over a range of pH from 7.4 to 10.0 in aqueous solution at 25 °C. The slope of the wave corresponded to a two-electron reversible process. The addition of magnesium caused a decrease in the polarographic wave for alizarin, but the combining ratio of magnesium to alizarin was a function of pH, ranging from 1.02 at pH 9.0 to 1.28 at pH 10.1. The combining ratio greater than unity could be attributed to alizarin adsorbed on a 1:1 (MgAlz) precipitate. The removal of alizarin from the solution was not quantitative in the presence of excess magnesium, and there is evidence of the formation of soluble complex species. The reaction is potentially useful for the indirect polarographic determination of magnesium.

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