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Automatic Voltammetric System for Continuous Trace Metal Monitoring in Various Environmental Samples
Author(s) -
Mikkelsen Øyvind,
Strasunskiene Kristina,
Skogvold Silje,
Schrøder Knut H.,
Johnsen Camilla Constance,
Rydningen Marion,
Jonsson Patrik,
Jonsson Anders
Publication year - 2007
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/elan.200703913
Subject(s) - zinc , environmental science , environmental chemistry , amalgam (chemistry) , calibration , heavy metals , calibration curve , metal , chemistry , electrode , metallurgy , detection limit , materials science , chromatography , mathematics , statistics
Some recent developments and results in the field of automatic monitoring of electrolabile concentration of zinc and iron in the low μg/L range in river water, drainage water, and waste water by use of solid dental amalgam electrode (DAM) as a working electrode are reviewed for three different geographical sites representing the mentioned matrixes. At all sites, voltammetric measurements were carried out continuously every 30 or 60 minutes for periods up to 4 months, and compared with total amounts of the metals found by ICP‐MS on manually collected samples. In total, the observed concentration ranges analyzed was in the ranges of sub‐μg/L to approximately 30 μg/L for zinc, and from approximately 1 μg/L to 150 μg/L. for iron. Results shows good calibration curves for the metals in the different matrixes ( r 2 avg =0.99) with standard deviation within 5%. The voltammetric system showed good stability and gave reliable results which were in a reasonable agreement with ICP‐MS measurements for all analyses when comparing the concentration trends. The frequency of maintenance varied from once a week in waste water samples to once a month in river water.