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Stripping Voltammetric Determination of Methyl Parathion at Activated Carbon Nanopowder Modified Electrode
Author(s) -
Stoytcheva Margarita,
Zlatev Roumen,
Velkova Zdravka,
Gochev Velizar,
Montero Gisela,
Valdez Benjamín,
Curiel Mario
Publication year - 2021
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.202060212
Subject(s) - activated carbon , adsorption , electrode , stripping (fiber) , differential pulse voltammetry , anodic stripping voltammetry , chemistry , detection limit , parathion methyl , nuclear chemistry , adsorptive stripping voltammetry , voltammetry , materials science , electrochemistry , analytical chemistry (journal) , cyclic voltammetry , chromatography , organic chemistry , composite material , pesticide , agronomy , biology
An activated carbon nanopowder modified glassy carbon electrode (AC‐GCE) was constructed for the sensitive determination of methyl parathion by adsorptive differential pulse anodic stripping voltammetry. The simple and rapid modification procedure included only drop‐coating the electrode surface with a laponite stabilized activated carbon nanopowder suspension and drying. The modifier high adsorption ability, combined with its large electroactive surface area allowed a 30‐fold signal increase to be achieved, compared to bare GCE. Under optimized experimental conditions (activated carbon to laponite ratio, pH and accumulation time), the AC‐GCE exhibited a linear response to methyl parathion in two concentration ranges: from 0.01 μmol L −1 to 1 μmol L −1 and from 1 μmol L −1 to 6 μmol L −1 . The LOD of 2.5 nmol L −1 (S/N=3) achieved fitted with regulatory norms. It was demonstrated that the as‐prepared AC‐GCE is suitable for routine real samples analysis.