polarographic detection
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2008 ◽  
Vol 5 (1) ◽  
pp. 115-121 ◽  
Author(s):  
W. Sun ◽  
N. Zhao ◽  
B. Xu ◽  
M. N. Wang ◽  
K. Jiao


2006 ◽  
Vol 41 (2) ◽  
pp. 190-197 ◽  
Author(s):  
Bhim Bali Prasad ◽  
Souri Banerjee ◽  
Dhana Lakshmi

Abstract This study examines a new Scytonema-based biosorbent (AlgaSORB-scy) using column chromatography for the biosorption of total inorganic arsenic [As(III) and As(V)] from aquatic samples. The AlgaSORB-scy was prepared by immobilizing a cyanobacterial biofilm (Scytonema-dimethyl-formamide slurry) over a polymer-modified silica gel and then characterized for stability and sorption/elution conditions under dynamic equilibrations followed by differential pulse polarographic detection. The sorbent exhibited a 100% affinity for As(III) in a multi-elemental solution [in the absence of As(V)] at pH 6.9 and a flow rate of 1 mL min-1 giving rise to a preconcentration factor as high as 44-fold. The interference caused by As(V) in the sorption of As(III) on AlgaSORB-scy necessitated the pre-reduction of As(V) into As(III) by sodium sulfite. The biosorbent was found to be suitable for total arsenic enrichment in the form of As(III) species and demonstrated a better endurance with a recyclability of up to 59 cycles of sorption-elution. The polymeric spacer between the cyanobacterial biofilm and the silica gel enabled the biofilm monolayer to be held firmly onto a solid support and be accessible for quantitative arsenic uptake without encountering any problems of interfacial overlapping, re-adsorption, or matrix effects in the drinking water supplied.



2003 ◽  
Vol 15 (4) ◽  
pp. 303-311 ◽  
Author(s):  
Carlos Bravo-Díaz ◽  
Elisa González-Romero




1998 ◽  
Vol 31 (10) ◽  
pp. 1757-1767 ◽  
Author(s):  
Shuhao Wang ◽  
Lingyun Du ◽  
Aimei Zhang ◽  
Daojie Liu






1998 ◽  
Vol 39 (2) ◽  
pp. 91-95 ◽  
Author(s):  
Janos Pataricza ◽  
Botond Penke ◽  
Gabor E Balogh ◽  
Julius Gy Papp


The Analyst ◽  
1998 ◽  
Vol 123 (5) ◽  
pp. 1151-1154 ◽  
Author(s):  
Paulo C. do Nascimento ◽  
Denise Bohrer


1997 ◽  
Vol 30 (11) ◽  
pp. 2099-2107 ◽  
Author(s):  
Shuhao Wang∗ ◽  
Lingyun Du ◽  
Aimei Zhang ◽  
Bin Li


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