Journal
ELECTROANALYSIS
Volume 33, Issue 3, Pages 744-754Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.202060213
Keywords
Bismuth; Poly-L-tyrosine; Glassy carbon electrode; Cadmium; Copper interference elimination by electrodeposition; Square wave anodic stripping voltammetry
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Funding
- Science and Technology Planning Project of Guangdong Province, P.R. China [2014 A040401071, 2015 A030401080]
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A bud-like poly-L-tyrosine/Bi modified glassy carbon electrode was prepared for enriching Cd2+ with high sensitivity, wide linear range, and low detection limit. The developed sensor successfully detected Cd in rice samples with good reliability and accuracy, while effectively eliminating interference caused by Cu2+. The method shows high selectivity, simplicity in operation, and wide application range.
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 Cd2+. The optimal Tyr concentration and scanning number for p-Tyr/GC preparation were 2.0 mmol . L-1 and 35, while the optimal Bi3+ concentration, pH and Cd2+ accumulation potential in test medium were 3.0 mu mol . L-1, 6.5 and -1.3 V, respectively. The linear equation of p-Tyr/Bi/GC's response to Cd2+ (1.0 nmol . L-1 to 2.0 mu mol . L-1) was i(p) (mu A) = -0.6809 + 100.2c (mu mol . L-1) (R-2 = 0.9985) with a detection limit of 0.11 nmol . L-1 (3S/N). The elimination of interference caused by Cu2+ 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 Cd2+ sensor exhibits high sensitivity, wide linear range and low detection limit, especially the designed method of eliminating Cu2+ interference has the characteristics of high selectivity, simple operation and wide application range.
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