Differential-pulse cathodic stripping voltammetric determination of nedocromil sodium at an unmodified and at a poly-L-lysine modified hanging mercury drop electrode

The Analyst ◽  
1994 ◽  
Vol 119 (11) ◽  
pp. 2439 ◽  
Author(s):  
Ramin Pirzad ◽  
Josino C. Moreira ◽  
Alan E. Davies ◽  
Arnold G. Fogg
Keyword(s):  
Differential Pulse ◽  
Voltammetric Determination ◽  
Nedocromil Sodium ◽  
Hanging Mercury Drop Electrode ◽  
Mercury Drop Electrode ◽  
Cathodic Stripping

The voltammetric determination of 4-nitrobiphenyl

1991 ◽  
Vol 56 (3) ◽  
pp. 595-601 ◽  
Author(s):  
Jiří Barek ◽  
Gulamustafa Malik ◽  
Jiří Zima
Keyword(s):  
Differential Pulse Voltammetry ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Hanging Mercury Drop Electrode ◽  
Optimum Conditions ◽  
Mercury Drop Electrode ◽  
Working Electrode ◽  
Pulse Voltammetry ◽  
Unstirred Solution

Optimum conditions were found for the determination of 4-nitrobiphenyl by fast scan differential pulse voltammetry at a hanging mercury drop electrode in the concentration range 1 . 10-5 to 2 . 10-7 mol l-1. A further increase in sensitivity was attained by adsorptive accumulation of this substance on the surface of the working electrode, permitting determination in the concentration range (2 – 10) . 10-8 mol l-1 with one minute accumulation of the substance in unstirred solution or (2 – 10) . 10-9 mol l-1 with three-minute accumulation in stirred solution. Linear scan voltammetry can be used to determine 4-nitrobiphenyl in the concentration range (2 – 10) . 10-9 mol l-1 with five-minute accumulation in stirred solution, with the advantage of a smoother baseline and smaller interference from substances that yield only tensametric peaks.

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