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Study on Cd 2+ Determination Using Bud‐like Poly‐L‐Tyrosine/Bi Composite Film Modified Glassy Carbon Electrode Combined with Eliminating of Cu 2+ Interference by Electrodeposition
Author(s) -
Wang YanRu,
Zhai WenYing,
Liu YouQin
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.202060213
Subject(s) - detection limit , electrode , analytical chemistry (journal) , materials science , glassy carbon , nuclear chemistry , selectivity , chemistry , chromatography , electrochemistry , organic chemistry , cyclic voltammetry , catalysis
A bud‐like poly‐L‐tyrosine/Bi modified glassy carbon electrode (p‐Tyr/Bi/GC) was prepared by CV and in situ Bi plating, whose conductivity and membrane morphology were characterized by CV, EIS and SEM, respectively. The p‐Tyr membrane can effectively promote the enrichment of Cd 2+ . The optimal Tyr concentration and scanning number for p‐Tyr/GC preparation were 2.0 mmol ⋅ L −1 and 35, while the optimal Bi 3+ concentration, pH and Cd 2+ accumulation potential in test medium were 3.0 μmol ⋅ L −1 , 6.5 and −1.3 V, respectively. The linear equation of p‐Tyr/Bi/GC's response to Cd 2+ (1.0 nmol ⋅ L −1 to 2.0 μmol ⋅ L −1 ) was i p (μA) = −0.6809 + 100.2 c (μmol ⋅ L −1 ) ( R 2 = 0.9985) with a detection limit of 0.11 nmol ⋅ L −1 (3 S / N ). The elimination of interference caused by Cu 2+ in sample was studied by electrodeposition. The p‐Tyr/Bi/GC electrode was successfully used for detecting Cd in rice samples with good reliability and accuracy. The developed Cd 2+ sensor exhibits high sensitivity, wide linear range and low detection limit, especially the designed method of eliminating Cu 2+ interference has the characteristics of high selectivity, simple operation and wide application range.