Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online]
The main objectives of this book are (i) to investigate the electrochemical behavior and the analytical performance of a novel ultramicroelectrode array (UMEA); (ii) to assess the analytical parameters of square-wave anodic stripping voltammetric measurements (SWASV) using the UMEA; and (iii) to est...
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| Format: | Online |
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KIT Scientific Publishing
2021
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| Online pristup: | 35122 |
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| _version_ | 1869522899858096128 |
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| author | Xie, Xudong |
| author_browse | Xie, Xudong |
| author_facet | Xie, Xudong |
| author_sort | Xie, Xudong |
| collection | Directory of Open Access Books |
| description | The main objectives of this book are (i) to investigate the electrochemical behavior and the analytical performance of a novel ultramicroelectrode array (UMEA); (ii) to assess the analytical parameters of square-wave anodic stripping voltammetric measurements (SWASV) using the UMEA; and (iii) to estimate the potential of the UMEA in developing decentralised analytical equipments for the determination of trace concentrations of heavy metals in natural waters. Surface analytical techniques (SEM, ESEM, and AFM) showed that the UMEA chips are of high quality in manufacture. Cyclic voltammetric and chronoamperometric experiments proved that the electrochemical behavior of the UMEA is dominated by the features characteristic for single microelectrodes.Chronocoulometry was found to be the most suitable method in generating the Hg-film of good quality. A new UMEA chip could be plated at least ten times, corresponding to about 500 measurements of trace metals in synthetic aqueous solutions. Using SWASV, detection limits of <0.1 ï¿g/l could be achieved for the metals (Pb, Cd). Precision and accuracy were found to be approx +/-10% of RSD.In natural waters, the results obtained with the UMEA sensor showed a reasonably good agreement with HR-ICP-MS analyses. Different experimental parameters were optimised and investigated. Interferences (e.g., DOC) were significantly reduced through medium exchange and standard addition. Ultrasonic bath proved to be very efficient in resurfacing electrodes in laboratory.The UMEA sensor shows a great potential in developing a portable trace metal analyzer. However, for in situ and on-site measurements, the protection of the UMEA sensor from fouling seems to be inevitable. In order to achieve a pure microelectrode behavior with the UMEA, increasing the ratio of interelectrode distance to electrode diameter is recommended for further developments. |
| format | Online |
| id | doab-20.500.12854ir-41448 |
| institution | Directory of Open Access Books |
| language | eng |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| publisher | KIT Scientific Publishing |
| publisherStr | KIT Scientific Publishing |
| record_format | ojs |
| spelling | doab-20.500.12854ir-414482024-04-04T19:19:02Z Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] Xie, Xudong QC1-999 Schwermetall Geochemie Chemischer Sensor Elektrochemischer Sensor Mikroelektrode Sensor thema EDItEUR::P Mathematics and Science::PH Physics The main objectives of this book are (i) to investigate the electrochemical behavior and the analytical performance of a novel ultramicroelectrode array (UMEA); (ii) to assess the analytical parameters of square-wave anodic stripping voltammetric measurements (SWASV) using the UMEA; and (iii) to estimate the potential of the UMEA in developing decentralised analytical equipments for the determination of trace concentrations of heavy metals in natural waters. Surface analytical techniques (SEM, ESEM, and AFM) showed that the UMEA chips are of high quality in manufacture. Cyclic voltammetric and chronoamperometric experiments proved that the electrochemical behavior of the UMEA is dominated by the features characteristic for single microelectrodes.Chronocoulometry was found to be the most suitable method in generating the Hg-film of good quality. A new UMEA chip could be plated at least ten times, corresponding to about 500 measurements of trace metals in synthetic aqueous solutions. Using SWASV, detection limits of <0.1 ï¿g/l could be achieved for the metals (Pb, Cd). Precision and accuracy were found to be approx +/-10% of RSD.In natural waters, the results obtained with the UMEA sensor showed a reasonably good agreement with HR-ICP-MS analyses. Different experimental parameters were optimised and investigated. Interferences (e.g., DOC) were significantly reduced through medium exchange and standard addition. Ultrasonic bath proved to be very efficient in resurfacing electrodes in laboratory.The UMEA sensor shows a great potential in developing a portable trace metal analyzer. However, for in situ and on-site measurements, the protection of the UMEA sensor from fouling seems to be inevitable. In order to achieve a pure microelectrode behavior with the UMEA, increasing the ratio of interelectrode distance to electrode diameter is recommended for further developments. 2021-02-11T08:35:30Z 2021-02-11T08:35:30Z 2019-07-30 20:02:00 2004 book 35122 16182677 3937300481 https://directory.doabooks.org/handle/20.500.12854/41448 eng Karlsruher Mineralogische und Geochemische Hefte image/jpeg https://www.ksp.kit.edu/3937300481 KIT Scientific Publishing 10.5445/KSP/1362004 10.5445/KSP/1362004 68fffc18-8f7b-44fa-ac7e-0b7d7d979bd2 3937300481 X, 133 p. open access |
| spellingShingle | QC1-999 Schwermetall Geochemie Chemischer Sensor Elektrochemischer Sensor Mikroelektrode Sensor thema EDItEUR::P Mathematics and Science::PH Physics Xie, Xudong Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] |
| title | Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] |
| title_full | Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] |
| title_fullStr | Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] |
| title_full_unstemmed | Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] |
| title_short | Assessment of an ultramicroelectrode array (UMEA) sensor for the determination of trace concentrations of heavy metals in water [online] |
| title_sort | assessment of an ultramicroelectrode array umea sensor for the determination of trace concentrations of heavy metals in water online |
| topic | QC1-999 Schwermetall Geochemie Chemischer Sensor Elektrochemischer Sensor Mikroelektrode Sensor thema EDItEUR::P Mathematics and Science::PH Physics |
| topic_facet | QC1-999 Schwermetall Geochemie Chemischer Sensor Elektrochemischer Sensor Mikroelektrode Sensor thema EDItEUR::P Mathematics and Science::PH Physics |
| url | 35122 |
| work_keys_str_mv | AT xiexudong assessmentofanultramicroelectrodearrayumeasensorforthedeterminationoftraceconcentrationsofheavymetalsinwateronline |