Jawad, Masar Hadi
(2013)
Adsorptive Cathodic Stripping Voltammertries Of Lead In Water Samples Using 2, 2'-Bipyridyl; 1,10- Phenanthroline And Nitrite Ions.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
A new differential pulse adsorptive cathodic stripping voltammetric
(DPAdCSV) method was developed for the determination of lead concentration in
aqueous solution.. This was based on complexation of lead with combination of two
complexing agents viz 2,21-hipyridyl and 1,1 O-phenanthroline with nitrite at hanging
mercury drop electrode (HMDE). Variables affecting the response such as pH,
supporting electrolyte, initial purge time, drop size, stirring speed, deposition
potential, deposition and equilibration times, sweep rate, pulse amplitude and ligand
concentration were investigated. Using the first reagent 2,2'-bipyridyl with
nitrite[reagent (I)] and under optimized conditions the relationship between peak
current and lead concentration was linear in the range of 10-500 ng mL-l. The limit
of detection was found to be 0.48 ng mL-l. The relative standard deviation (RSD) for
n= 9 determinations of standard 25 ng mL-I Pb2+ was to 1.74% with linear regression
coefficient (R2) 0.9991.
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