In this work, we designed, fabricated and tested a disposable, flow-through amperometric sensor for free chlorine determination in water. The sensor is based on the principle of an electrochemical cell. The substrate, as well as the top microfluidic layer, is made up of a polymer material. The advantages include; (a) disposability from low cost; (b) stable operation range from three-electrode design; (c) fluidic interconnections that provide on line testing capabilities; and (d) transparent substrate which provides for future integration of on-chip optics. The sensor showed a good response and linearity in the chlorine concentration ranging from 0.3 to 1.6 ppm, which applies to common chlorination process for drinking water purification.
In this work, we designed, fabricafed and tested a low cost, disposable, flow-fhrough sensor fo determine the amounf of free chlorine in wafer. The whole sensor cell combining electrodes and a fluidic channel is micromachined on a chemically-inert fransparenf cyclic olefin copolymer substrate. The advantages are (a) disposability from low cost (6) wide operafion range from three-elecfrode design (c) easy electrical andfluidic inferconnecfionfrom a chip format, compared fo previous. works The sensor showed a good response and linearity in the chlorine concenfrafion ;ranging from 1.5 fo 8 ppm, which applies fo common chlorinaiion process
A disposable microbial sensor was designed, fabricated and tested for standard BOD (Biochemical Oxygen Demand) measurements. A transparent Cyclic Olefin Copolymer (COC) substrate was used for sensor fabrication. Standard lithographic procedures in addition to techniques like screen printing and electroplating were used to fabricate the sensor. A layer of a microbial strain of Trichosporon Cutaneum was immobilized over one pair of sensor electrodes while the other was used as a reference. Depending on the respiratory activities of the microbial strain in different samples, the BOD values of the samples could be measured in terms of difference between the output signals. The sensor layer was enclosed by an injectionmolded passive microfluidic channel on the top. The BOD sensor was calibrated and tested with standard BOD solutions and samples obtained from a wastewater reclamation facility. Good correlation with chemically determined BOD 5 values was obtained with fast response time. Advantages of the BOD microsensor include (a) fast BOD measurement (b) disposability from a low cost, chemically inert polymer substrate (c) flow-through sample injection scheme and (d) possible future integration of on-chip optics.
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