ID 54377
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Author
Karita, Shingo Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University
Kaneta, Takashi Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University ORCID Kaken ID
Abstract
We developed microfluidic paper-based analytical devices (μPADs) for the chelate titrations of Ca2+ and Mg2+ in natural water. The μPAD consisted of ten reaction zones and ten detection zones connected through narrow channels to a sample zone located at the center. Buffer solutions with a pH of 10 or 13 were applied to all surfaces of the channels and zones. Different amounts of ethylenediaminetetraacetic acid (EDTA) were added to the reaction zones and a consistent amount of a metal indicator (Eriochrome Black T or Calcon) was added to the detection zones. The total concentrations of Ca2+ and Mg2+ (total hardness) in the water were measured using a μPAD containing a buffer solution with a pH of 10, whereas only Ca2+ was titrated using a μPAD prepared with a potassium hydroxide solution with a pH of 13. The μPADs permitted the determination of Ca2+ and Mg2+ in mineral water, river water, and seawater samples within only a few minutes using only the naked eye—no need of instruments.
Keywords
Chelate titration
Microfluidic paper-based analytical device
Hardness
Calcium
Magnesium
Natural water
Note
© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Published Date
2016-06-14
Publication Title
Analytica Chimica Acta
Volume
volume924
Publisher
Elsevier B.V.
Start Page
60
End Page
67
ISSN
0003-2670
NCID
AA00524834
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
© 2016 Elsevier B.V.
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Related Url
isVersionOf https://doi.org/10.1016/j.aca.2016.04.019