Publication: Dual-Purpose Photometric-Conductivity Detector for Simultaneous and Sequential Measurements in Flow Analysis
Issued Date
2020-05-13
Resource Type
ISSN
14203049
Other identifier(s)
2-s2.0-85084787578
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Mahidol University
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SCOPUS
Bibliographic Citation
Molecules (Basel, Switzerland). Vol.25, No.10 (2020)
Suggested Citation
Thitirat Mantim, Korbua Chaisiwamongkhol, Kanchana Uraisin, Peter C. Hauser, Prapin Wilairat, Duangjai Nacapricha Dual-Purpose Photometric-Conductivity Detector for Simultaneous and Sequential Measurements in Flow Analysis. Molecules (Basel, Switzerland). Vol.25, No.10 (2020). doi:10.3390/molecules25102284 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/56112
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Title
Dual-Purpose Photometric-Conductivity Detector for Simultaneous and Sequential Measurements in Flow Analysis
Abstract
This work presents a new dual-purpose detector for photometric and conductivity measurements in flow-based analysis. The photometric detector is a paired emitter-detector diode (PEDD) device, whilst the conductivity detection employs a capacitively coupled contactless conductivity detector (C4D). The flow-through detection cell is a rectangular acrylic block (ca. 2 × 2 × 1.5 cm) with cylindrical channels in Z-configuration. For the PEDD detector, the LED light source and detector are installed inside the acrylic block. The two electrodes of the C4D are silver conducting ink painted on the PEEK inlet and outlet tubing of the Z-flow cell. The dual-purpose detector is coupled with a sequential injection analysis (SIA) system for simultaneous detection of the absorbance of the orange dye and conductivity of the dissolved oral rehydration salt powder. The detector was also used for sequential measurements of creatinine and the conductivity of human urine samples. The creatinine analysis is based on colorimetric detection of the Jaffé reaction using the PEDD detector, and the conductivity of the urine, as measured by the C4D detector, is expressed in millisiemens (mS cm-1).