Martínez-Aviño A, Molins-Legua C, Pilar CF. Scaling the Analytical Information Given by Several Types of Colorimetric and Spectroscopic Instruments Including Smartphones: Rules for Their Use and Establishing Figures of Merit of Solid Chemosensors.
Anal Chem 2021;
93:6043-6052. [PMID:
33819024 PMCID:
PMC9177042 DOI:
10.1021/acs.analchem.0c03994]
[Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
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The
analytical information given by different types of instruments
was scaled in order to establish suitably the figures of merit of
a given methodology based on color measurements. Different lab and
portable instruments, including smartphones with and without a miniaturized
spectrophotometer accessory, have been tested. In order to obtain
broad information and using objective criteria, these instruments
have been compared from (1) the analytical point of view, considering
mainly the detection limit (limits of detection [LODs]), selectivity,
accuracy and intra- and interday precision, size, components, and
costs; and (2) the environmental point of view, based on their footprint
as kilograms of CO2. No significant differences in the
precision were obtained with RSD (%) values lower than 10% for all
of the instruments, but the achieved values of LOD, selectivity, accuracy,
and cost were different. Footprints of CO2 were better
for portable instrumentation, especially for smartphones. Three solid
chemosensors made of different materials (PDMS, paper, or nylon) have
been tested for the determination of ammonia and hydrogen sulfide
at different concentration levels (ppb levels). As a result of this
study,
some rules for selecting the instrument for obtaining the required
information have been established. Two apps have been developed for
quantitation by smartphones, one for working with RGB values and the
other for spectra obtained by the miniaturized spectrophotometer coupled
to a smartphone.
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