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Peak Area, Peak Current: Critical Comparison. Application to Real Samples
Author(s) -
Locatelli Clinio,
Torsi Giancarlo
Publication year - 1998
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199810)10:13<904::aid-elan904>3.0.co;2-0
Subject(s) - seawater , analytical chemistry (journal) , cadmium , detection limit , copper , standard deviation , chemistry , relative standard deviation , accuracy and precision , metal , zinc , drop (telecommunication) , amplitude , current (fluid) , horizontal scan rate , materials science , electrode , chromatography , mathematics , thermodynamics , electrochemistry , statistics , cyclic voltammetry , physics , optics , computer science , telecommunications , oceanography , organic chemistry , geology
The possibility of using peak area as instrumental datum for determining the concentration of metal species in solution (instead of peak height) is proposed for analytical voltammetric determinations. In this work a comparison is made between peak area and peak current in voltammetric metal determinations. The metals considered are copper(II), lead(II), cadmium(II) and zinc(II) in seawater. The influence of the instrumental parameters (pulse amplitude, electrodeposition time, stirring rate, potential scan rate, drop size, delay before sweep) on the data is studied, in order to optimize the analytical procedure. The precision and accuracy of the analytical method was tested on the reference material Sea Water BCR‐CRM 403. The precision, expressed as relative standard deviation ( s r ), and the accuracy, expressed as relative error ( e ), were, in all cases of the order of 3 to 5 %, while the detection limit was around 10 −3 μg L −1 for all the metals.