Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
권호 표지
DOI QR코드

DOI QR Code

Real-Time Detection of Residual Free Chlorine and pH in Water Using a Microchannel Device

  • Kim, Sam-Hwan (Graduate School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Choi, Ju-Chan (Graduate School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Lee, June-Kyoo (Graduate School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Kong, Seong-Ho (School of Electronics Engineering, College of IT Engineering, Kyungpook National University)
  • Received : 2011.07.06
  • Accepted : 2011.09.14
  • Published : 2011.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

A microfluidic device for real-time monitoring of residual free chlorine and pH in water based on optical absorption is proposed. The device consists of a serpentine micromixer for mixing samples with a reagent, and a photodiode and light emitting diode(LED) for the detection of light absorbance at specific wavelengths, determined for specific reagent combinations. Spectral analyses of the samples mixed with N, N'-diethyl-p-phenylenediamine(DPD) reagent for chlorine determination and bromothymol blue(BTB) for pH measurement are performed, and the wavelengths providing the most useful linear changes in absorbance with chlorine concentration and pH are determined and used to select the combination of LED and photodiode wavelengths for each analyte. In tests using standard solutions, the device is shown to give highly reproducible results, demonstrating the feasibility of the device for the inexpensive and continuous monitoring of water quality parameters with very low reagent consumption.

Keywords

References

  1. C. S. Cassidy, L. R. Matthews, K. H. Church, R. M. Taylor, and K. A. Taegue, "In situ chlorine detection by ultraviolet absorption spectroscopy", Proc. Circuits and Systems, 2002. MWSCAS-2002, vol. 2, pp. 553-556, USA, 2002.
  2. Hiroshi Tomiyasu and Gilbert Gordon, "Colorimetric determination of ozone in water based on reaction with bis(terpyridine)iron", Anal. Chem., vol. 56, pp. 752-754, 1984. https://doi.org/10.1021/ac00268a036
  3. D. J. Leggett, N. H. Chen, and D. S. mahadevappa, "A flow injection method for analysis of residual chlorine by the DPD procedure", Fresenius Z. Anal. Chem., vol. 315, pp. 47-50, 1983. https://doi.org/10.1007/BF00476405
  4. R. D. Alexander, A. W. L. Dudeney, and R. J. Irving, "An apparatus for precise measurement of absorbance of aqueous solutions at temperatures up to 250 ${^{\circ}C}$", Journal of Physics E, vol. 7, pp. 522- 524, 1974. https://doi.org/10.1088/0022-3735/7/7/010
  5. I. Grabowska, M. Sajnoga, M. Juchniewicz, M. Chudy, A. Dybko, and Z. Brzozka, "Microfluidic system with electrochemical and optical detection", Microelectron. Eng., vol. 84, pp. 1741-1743, 2007. https://doi.org/10.1016/j.mee.2007.01.248
  6. S. Balslev, A. M. Jorgensen, B. Bilengberg, K. B. Mogensen, D. Snakenborg, O. Geschke, J. P. Kutter, and A. Kristensen, "Lab-on-a-chip with integrated optical transducers", Lab chip., vol. 6, pp. 213-217, 2006. https://doi.org/10.1039/b512546d
  7. D. J. Sadler, R. Changrani, and P. Roberts, "Thermal management of bioMEMS: Temperature control for ceramic-based PCR and DNA detection devices", IEEE Trans. Compon. Packaging Technol., vol. 26, no. 2, pp. 309-316, 2003. https://doi.org/10.1109/TCAPT.2003.815093
  8. C. Chen and C. C. Cho, "A combined active/passive scheme for enhancing the mixing efficiency of microfluidic devices", Chem. Eng. Scie., vol. 63, pp. 3081-3087, 2008. https://doi.org/10.1016/j.ces.2008.03.007
  9. J. K. Lee and S. J. Kwon, "Mixing efficienty of a Jmultilamincation micromixer with consecutive recirculation zones", Chem. Eng. Scie., vol. 64, pp. 1223-1231, 2009. https://doi.org/10.1016/j.ces.2008.11.011
  10. S. H. Huang, S. K. Wang, H. S. Khoo, and F. G. Tseng, "AC electroosmotic generated in-plane microvortices for stationary of continuous fluid mixing", Sens and Actuator B-chem, vol. 125, pp. 326-336, 2007. https://doi.org/10.1016/j.snb.2007.01.046
  11. C. C. Hong, J. W. Choi, and C. H. Ahn, "A novel in-plane passive microfluidic mixer with modified Tesla structures", Lab. Chip., vol. 4, pp. 109-113, 2004. https://doi.org/10.1039/b305892a