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Title: Microfluidic analysis with front-face fluorometric detection for the determination of total inorganic iodine in drinking water
Authors: Prawpan Inpota
Kamil Strzelak
Robert Koncki
Wisaroot Sripumkhai
Wutthinan Jeamsaksiri
Nuanlaor Ratanawimarnwong
Prapin Wilairat
Nathawut Choengchan
Rattikan Chantiwas
Duangjai Nacapricha
King Mongkut's Institute of Technology Ladkrabang
Uniwersytet Warszawski
Mahidol University
Srinakharinwirot University
Flow Innovation-Research for Science and Technology Laboratories (FIRST Labs.
Thai Microelectronics Center (TMEC)
Keywords: Chemistry
Issue Date: 1-Jan-2018
Citation: Analytical Sciences. Vol.34, No.2 (2018), 161-167
Abstract: © The Japan Society for Analytical Chemistry. A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction with the Sandell-Kolthoff reaction, in which iodide catalyzed the redox reaction between Ce(IV) and As(III). Direct alignment of an optical fiber attached to a spectrofluorometer was used as a convenient detector for remote front-face fluorometric detection. Trace inorganic iodine (IO 3- and I - ) present naturally in drinking water was measured by on-line conversion of iodate to iodide for determination of total inorganic iodine. On-line conversion efficiency of iodate to iodide using the microfluidic device was investigated. Excellent conversion efficiency of 93 - 103% (%RSD = 1.6 - 11%) was obtained. Inorganic iodine concentrations in drinking water samples were measured, and the results obtained were in good agreement with those obtained by an ICP-MS method. Spiked sample recoveries were in the range of 86%(±5) - 128%(±8) (n = 12). Interference of various anions and cations were investigated with tolerance limit concentrations ranging from 10-6 to 2.5 M depending on the type of ions. The developed method is simple and convenient, and it is a green method for iodine analysis, as it greatly reduces the amount of toxic reagent consumed with reagent volumes in the microfluidic scale.
ISSN: 13482246
Appears in Collections:Scopus 2018

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