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  • Potentiometric E-Tongue System for Geosmin/Isoborneol Presence Monitoring in Drinkable Water.

Potentiometric E-Tongue System for Geosmin/Isoborneol Presence Monitoring in Drinkable Water.

Sensors (Basel, Switzerland) (2020-02-09)
Larisa Lvova, Igor Jahatspanian, Luiz H C Mattoso, Daniel S Correa, Ekaterina Oleneva, Andrey Legin, Corrado Di Natale, Roberto Paolesse
ABSTRACT

A potentiometric E-tongue system based on low-selective polymeric membrane and chalcogenide-glass electrodes is employed to monitor the taste-and-odor-causing pollutants, geosmin (GE) and 2-methyl-isoborneol (MIB), in drinkable water. The developed approach may permit a low-cost monitoring of these compounds in concentrations near the odor threshold concentrations (OTCs) of 20 ng/L. The experiments demonstrate the success of the E-tongue in combination with partial least squares (PLS) regression technique for the GE/MIB concentration prediction, showing also the possibility to discriminate tap water samples containing these compounds at two concentration levels: the same OTC order from 20 to 100 ng/L and at higher concentrations from 0.25 to 10 mg/L by means of PLS-discriminant analysis (DA) method. Based on the results, developed multisensory system can be considered a promising easy-to-handle tool for express evaluation of GE/MIB species and to provide a timely detection of alarm situations in case of extreme pollution before the drinkable water is delivered to end users.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
5,10,15,20-Tetraphenyl-21H,23H-porphine manganese(III) chloride, 95%
Supelco
2-Methylisoborneol solution, certified reference material, TraceCERT®, 100 μg/mL in methanol, ampule of 1 mL
Supelco
Potassium tetrakis(4-chlorophenyl)borate, Selectophore, ≥98.0%