Adsorption Voltammetric Determination of Trace Orthophosphate in Samples of Tap Water and Nutrition

The voltammetric behavior of orthophosphate complex in a 0.4 mol/liter HCl−1.0 × 10 −4mol/liter V(V)−3.0 × 10 −3mol/liter ammonium molybdate medium is described. The complex can be adsorbed on a hanging mercury drop electrode and given a reduction peak whose peak potential is at −0.50 V (vs. standar...

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Bibliographic Details
Published inMicrochemical journal Vol. 53; no. 2; pp. 230 - 235
Main Authors Wang, Lizeng, Ma, Chengsong, Zhang, Xiaoli, Liu, Li
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier B.V 01.02.1996
Elsevier
Subjects
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
Trace analysis
Water
Phosphates
Heteropolyacid
Chemical analysis
Adsorption
Dropping electrode
Nutrient
Voltammetry
Tap water
Hanging drop method
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Summary:The voltammetric behavior of orthophosphate complex in a 0.4 mol/liter HCl−1.0 × 10 −4mol/liter V(V)−3.0 × 10 −3mol/liter ammonium molybdate medium is described. The complex can be adsorbed on a hanging mercury drop electrode and given a reduction peak whose peak potential is at −0.50 V (vs. standard calomel electrode). The derivative peak current is linearly proportional to the concentration for orthophosphate in the range from 1.0 × 10 −2to 2.0 × 10 −6mol/liter. The detection limit is 5.0 × 10 −9mol/liter. The presence of acetone made the complex wave more stable. This sensitive and accurate method can be used to determine trace PO 4 3−in tap water and nutritional samples.
ISSN:0026-265X
1095-9149
DOI:10.1006/mchj.1996.0033