Beyond Karl Fischer titration: a monolithic quantum cascade sensor for monitoring residual water concentration in solvents

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU148295" target="_blank" >RIV/00216305:26620/23:PU148295 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlelanding/2023/LC/D2LC00724J" target="_blank" >https://pubs.rsc.org/en/content/articlelanding/2023/LC/D2LC00724J</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/d2lc00724j" target="_blank" >10.1039/d2lc00724j</a>

Result language

angličtina

Original language name

Beyond Karl Fischer titration: a monolithic quantum cascade sensor for monitoring residual water concentration in solvents

Original language description

Quality control of liquids is an important part of analytical chemistry. The gold standard for measuring residual water in organic solvents and pharmaceutical applications is Karl Fischer titration. It has a high sensitivity, selectivity and accuracy. The downsides are a time-consuming offline analysis, together with the need for toxic reagents producing waste, and it suffers from poor inter-laboratory reproducibility. In this work, we present a high-performance lab-on-a-chip sensor exploiting mid-IR spectroscopy for liquid sensing. It is operating at 6.1 mu m wavelength and is suitable for robust and flexible real-time in situ analysis of the residual water concentration in isopropyl alcohol. This is demonstrated in two experiments. A custom-made 60 mu L flow cell is employed to measure only minute amounts of analyte in an inline configuration. In a second approach, the whole sensor is immersed into the analyte to demonstrate sensitive and rapid in situ operation on the millisecond time scale. This is confirmed by the ability for time resolved single water-droplet monitoring, while they are mixed into the liquid sample. We obtain a limit of detection between 120 ppm and 150 ppm with a concentration coverage spanning three orders of magnitude from 1.2 x 10(-2)%(vol) to 25%(vol) for the flow cell and 1.5 x 10(-2)%(vol) to 19%(vol) in the in situ configuration, respectively.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10600 - Biological sciences

Project

—

Continuities

—

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

LAB ON A CHIP

ISSN

1473-0197

e-ISSN

1473-0189

Volume of the periodical

23

Issue of the periodical within the volume

7

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

1816-1824

UT code for WoS article

000934626400001

EID of the result in the Scopus database

2-s2.0-85148674049