Arsenic speciation study using X-ray fluorescence and cathodic stripping voltammetry

2008 ◽  
pp. 265-271 ◽  
Author(s):  
L Valcárcel ◽  
A Montero ◽  
J Estévez
Keyword(s):  
Arsenic Speciation ◽  
Stripping Voltammetry ◽  
X Ray ◽  
Cathodic Stripping Voltammetry ◽  
Speciation Study ◽  
Cathodic Stripping

Arsenic speciation in natural waters by cathodic stripping voltammetry

2010 ◽  
Vol 662 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Kristoff Gibbon-Walsh ◽  
Pascal Salaün ◽  
Constant M.G. van den Berg
Keyword(s):  
Natural Waters ◽  
Arsenic Speciation ◽  
Stripping Voltammetry ◽  
Cathodic Stripping Voltammetry ◽  
Cathodic Stripping

Arsenic Speciation: Reduction of Arsenic(V) to Arsenic(III) by Fulvic Acid

2006 ◽  
Vol 3 (2) ◽  
pp. 137 ◽  
Author(s):  
Tsanangurayi Tongesayi ◽  
Ronald B. Smart
Keyword(s):  
Fulvic Acid ◽  
Arsenic Removal ◽  
Research Effort ◽  
Arsenic Speciation ◽  
Inorganic Arsenic ◽  
Stripping Voltammetry ◽  
Reduction Reaction ◽  
Cathodic Stripping Voltammetry ◽  
Suwannee River Fulvic Acid ◽  
Removal Technologies

Environmental Context.Most technologies for arsenic removal from water are based on the oxidation of the more toxic and more mobile arsenic(iii) to the less toxic and less mobile arsenic(v). As a result, research effort has been focussed on the oxidation of arsenic(iii) to arsenic(v). It is equally important to explore environmental factors that enhance the reduction of arsenic(v) to arsenic(iii). An understanding of the redox cycling of arsenic could result in the development of cheaper and more efficient arsenic removal technologies, especially for impoverished communities severely threatened by arsenic contamination. Abstract.The objective of this study was to investigate the reduction of inorganic arsenic(v) with Suwannee River fulvic acid (FA) in aqueous solutions where pH, [FA], [As(v)], [As(iii)], and [Fe(iii)] were independently varied. Samples of inorganic As(v) were incubated with FA in both light and dark at constant temperature. Sterilisation techniques were employed to ensure abiotic conditions. Aliquots from the incubated samples were taken at various time intervals and analysed for As(iii) using square-wave cathodic-stripping voltammetry at a hanging mercury drop electrode. The study demonstrated the following important aspects of As speciation: (1) FA can significantly reduce As(v) to As(iii); (2) reduction of As(v) to As(iii) is a function of time; (3) both dark and light conditions promote reduction of As(v) to As(iii); (4) Fe(iii) speeds up the reduction reaction; and (5) oxidation of As(iii) to As(v) is promoted at pH 2 more than at pH 6.

Cathodic stripping voltammetry of sulfide

1972 ◽  
Vol 60 (2) ◽  
pp. 475-477 ◽  
Author(s):  
Tomoo Miwa ◽  
Yukio Fujii ◽  
Atsushi Mizuike
Keyword(s):  
Stripping Voltammetry ◽  
Cathodic Stripping Voltammetry ◽  
Cathodic Stripping
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