Voltammetric determination of trace level of cadmium in mussels and seawaters by a lacunar apatite-modified carbon electrode

• Published in: Journal of food measurement & characterization Vol. 13; no. 3; pp. 2318 - 2327
• Main Authors: Lahrich, Sara, Saqrane, Sana, Manoun, Bouchaib, El Mhammedi, Moulay Abderrahim
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-09-2019; Springer Nature B.V
• Subjects: Anodic stripping; Apatite; Cadmium; Calibration; Carbon; Chemical analysis; Chemical sensors; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Electrochemistry; Electrodes; Engineering; Food Science; Mollusks; Mussels; Original Paper; Parameter modification; Potassium; Seawater; Trace levels; Voltammetry; Water analysis; Cadmium; Apatite; Differential pulse anodic stripping voltammetry; Mussels; Seawater
• ISSN: 2193-4126; 2193-4134
• DOI: 10.1007/s11694-019-00151-2

An electrochemical sensor was fabricated by potassium lacunar apatite (KCaAP). This sensor, coupled with differential pulse anodic stripping voltammetry, could provide a means for a relatively inexpensive detector for trace levels of cadmium. The analytical performance was evaluated with respect to the quantity of modifier in the paste, preconcentration time and the stripping voltammetric parameters. A linear calibration graph was obtained in the concentration range 7.0 × 10
–7
–1.0 × 10
–4
 mol L
−1
Cd (II) with a detection limit of 4.86 × 10
−8
 mol L
−1
. For eight repetitions, the differential pulse voltammetric response was repeated with 7.15% and 4.69% expressed as relative standard deviations in 9.0 × 10
−6
and 9.0 × 10
−5
 mol L
−1
of cadmium (II), respectively. The lacunar apatite modified carbon paste electrode (KCaAP-CPE) was applied to the detection of cadmium content in mussels and seawater samples with satisfactory results.