Publication: An automated catalytic spectrophotometric method for manganese analysis using a chip-multisyringe flow injection system (Chip-MSFIA)
Issued Date
2014-07-21
Resource Type
ISSN
17599679
17599660
17599660
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2-s2.0-84903589770
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Mahidol University
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SCOPUS
Bibliographic Citation
Analytical Methods. Vol.6, No.14 (2014), 5088-5096
Suggested Citation
Piyawan Phansi, Camelia Henríquez, Edwin Palacio, Prapin Wilairat, Duangjai Nacapricha, Víctor Cerdà An automated catalytic spectrophotometric method for manganese analysis using a chip-multisyringe flow injection system (Chip-MSFIA). Analytical Methods. Vol.6, No.14 (2014), 5088-5096. doi:10.1039/c4ay00624k Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/33562
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Title
An automated catalytic spectrophotometric method for manganese analysis using a chip-multisyringe flow injection system (Chip-MSFIA)
Abstract
In this work, we present an automated catalytic spectrophotometric method for determination of Mn(ii) by using a multisyringe burette coupled to a chip microfluidic-conductor (Chip-MSFIA). The reaction is based on the catalytic effect of Mn(ii) on the auto-oxidation reaction of succinimidedioxime (SIDO). Reagents and the sample were simultaneously dispensed to the chip for their complete mixing, heating, and measurement. The absorbance of the reaction product was measured at 700 nm. The product concentration could be determined by the fixed-time and the initial rate method under optimum conditions (temperature 35°C, 4.70 mmol L-1 SIDO, and 0.60 mol L -1 NaOH). Both fixed-time and initial rate methods have been developed, with the fixed-time method giving higher reproducibility and a wider working range. Therefore it was selected for Mn(ii) samples in the working range of 1-20 μg L-1 of Mn(ii). The estimated precision was 0.67% (5 μg L-1, n = 15) and the limit of detection of Mn(ii) was 0.33 μg L-1. The proposed method is highly sensitive, selective, and simple for trace Mn(ii) determination without extraction and separation steps. The system was successfully applied to water samples with an injection throughput of 22 injections h-1. © 2014 The Royal Society of Chemistry.