The paper presents a construction of a system for measurements of pH, concentration of calcium ions and concentration of heavy metal ions in water. Three fiber optic sensors in flow configuration were designed and tested. The system is fully automatic and can be used for water quality monitoring.
This paper describes a new contactless conductivity detector, whose electrodes are constructed of microchannels filled with solution of KCl - called pseudoelectrodes. The lab-on-a-chip microdevice was fabricated in poly(dimethylsiloxane) PDMS, using a moulding technique. The mould was made from a dry negative photoresist with a thickness of 50 μm. During the tests, the dimension! and arrangement of pseudoelectrodes` microchannels were evaluated. The analyte was pumped into the microchannel using a syringe pump with a flow rate of 50 μL/min. Reproducible!changes of the signal were obtained.
Two constructions of microfluidic structures are described in this paper. A fibre optic microcell for spectrophometric measurements and a microcell for fluorescence experiments were designed and tested. The structures were made of polymer optical fibres which were incorporated into polymeric material i.e. poly(dimethylsiloxane). The structures were tested as detectors in absorbance measurement (solutions of bromothymol blue with diffierent pH were used) and in fluorescence tests (solution of fluoresceine was used).