Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes
Single-point standard addition, along with internal standard calibration (SSA-IS), is investigated as a new protocol in cadmium quantification by square wave anodic stripping voltammetry (SWASV) and using bismuth film/glassy carbon electrode (Bi/GCE). The bismuth oxidation signal used as an in situ...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-01-01
|
| Series: | Results in Chemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715622003496 |
| _version_ | 1811198960035954688 |
|---|---|
| author | María Camila González-Basto Carlos Andrés España-Sánchez Jesús A. Ágreda Andrea del Pilar Sandoval-Rojas |
| author_facet | María Camila González-Basto Carlos Andrés España-Sánchez Jesús A. Ágreda Andrea del Pilar Sandoval-Rojas |
| author_sort | María Camila González-Basto |
| collection | DOAJ |
| description | Single-point standard addition, along with internal standard calibration (SSA-IS), is investigated as a new protocol in cadmium quantification by square wave anodic stripping voltammetry (SWASV) and using bismuth film/glassy carbon electrode (Bi/GCE). The bismuth oxidation signal used as an in situ internal standard compensates for random variations between measurements. Moreover, the SSA-IS calibration method is proposed as a practical solution to the passivation of the working electrode. SSA-IS improves the results (RSD = 6.77 %, bias = 5.16 %), compared to the multi-point external standard calibration without internal standard (ESC), (RSD = 29.71 %, bias = 58.80 %) and with internal standard (ESC-IS), (RSD = 6.88 %, bias = 29.23 %). Also, the uncertainty and trueness of the proposed method were estimated and compared with the NIST 3108 reference material. An average concentration of 9.77 ± 0.96 mg g−1 was obtained, which statistically agrees with the certified value of the NIST reference material, 10.007 ± 0.027 mg g−1. Using the SSA-IS method improves the metrological qualities of the analytical technique, making the methodology ready to be tested in real samples such as cocoa. |
| first_indexed | 2024-04-12T01:40:03Z |
| format | Article |
| id | doaj.art-d12eb0b1cf774377a031cdfca4e21d14 |
| institution | Directory Open Access Journal |
| issn | 2211-7156 |
| language | English |
| last_indexed | 2024-04-12T01:40:03Z |
| publishDate | 2022-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Chemistry |
| spelling | doaj.art-d12eb0b1cf774377a031cdfca4e21d142022-12-22T03:53:13ZengElsevierResults in Chemistry2211-71562022-01-014100630Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodesMaría Camila González-Basto0Carlos Andrés España-Sánchez1Jesús A. Ágreda2Andrea del Pilar Sandoval-Rojas3Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Cra. 30 No. 45 - 03, Edificio 451, Bogota, DC 111321, ColombiaSubdirección de Metrología Química y Biomedicina, Instituto Nacional de Metrologia de Colombia, Ak. 50 No. 26-55 Int.2, Bogota, DC 111321, ColombiaDepartamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Cra. 30 No. 45 - 03, Edificio 451, Bogota, DC 111321, ColombiaDepartamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Cra. 30 No. 45 - 03, Edificio 451, Bogota, DC 111321, Colombia; Corresponding author.Single-point standard addition, along with internal standard calibration (SSA-IS), is investigated as a new protocol in cadmium quantification by square wave anodic stripping voltammetry (SWASV) and using bismuth film/glassy carbon electrode (Bi/GCE). The bismuth oxidation signal used as an in situ internal standard compensates for random variations between measurements. Moreover, the SSA-IS calibration method is proposed as a practical solution to the passivation of the working electrode. SSA-IS improves the results (RSD = 6.77 %, bias = 5.16 %), compared to the multi-point external standard calibration without internal standard (ESC), (RSD = 29.71 %, bias = 58.80 %) and with internal standard (ESC-IS), (RSD = 6.88 %, bias = 29.23 %). Also, the uncertainty and trueness of the proposed method were estimated and compared with the NIST 3108 reference material. An average concentration of 9.77 ± 0.96 mg g−1 was obtained, which statistically agrees with the certified value of the NIST reference material, 10.007 ± 0.027 mg g−1. Using the SSA-IS method improves the metrological qualities of the analytical technique, making the methodology ready to be tested in real samples such as cocoa.http://www.sciencedirect.com/science/article/pii/S2211715622003496Cadmium quantificationSquare wave anodic stripping voltammetryRepeatabilityTruenessBismuth film - glassy carbon electrode passivation |
| spellingShingle | María Camila González-Basto Carlos Andrés España-Sánchez Jesús A. Ágreda Andrea del Pilar Sandoval-Rojas Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes Results in Chemistry Cadmium quantification Square wave anodic stripping voltammetry Repeatability Trueness Bismuth film - glassy carbon electrode passivation |
| title | Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes |
| title_full | Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes |
| title_fullStr | Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes |
| title_full_unstemmed | Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes |
| title_short | Improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes |
| title_sort | improving precision and trueness in the quantification of cadmium using square wave anodic stripping voltammetry and bismuth film electrodes |
| topic | Cadmium quantification Square wave anodic stripping voltammetry Repeatability Trueness Bismuth film - glassy carbon electrode passivation |
| url | http://www.sciencedirect.com/science/article/pii/S2211715622003496 |
| work_keys_str_mv | AT mariacamilagonzalezbasto improvingprecisionandtruenessinthequantificationofcadmiumusingsquarewaveanodicstrippingvoltammetryandbismuthfilmelectrodes AT carlosandresespanasanchez improvingprecisionandtruenessinthequantificationofcadmiumusingsquarewaveanodicstrippingvoltammetryandbismuthfilmelectrodes AT jesusaagreda improvingprecisionandtruenessinthequantificationofcadmiumusingsquarewaveanodicstrippingvoltammetryandbismuthfilmelectrodes AT andreadelpilarsandovalrojas improvingprecisionandtruenessinthequantificationofcadmiumusingsquarewaveanodicstrippingvoltammetryandbismuthfilmelectrodes |