Rapid quality test for drinking water by vertical-channel organic semiconductor gas sensor

Wen Ling Chang, I. Ming Sun, Jie An Tsai, Hsin Fei Meng*, Hsiao Wen Zan*, Li Yin Chen*, Chia Jung Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this work, we proposed a rapid and easy check of the drinking water pollution level due to bacteria growth by semiconductor gas sensor. Highly sensitive vertical channel organic ammonia gas sensor was used to detect the gases emitted from the polluted water, and then determined effective ammonia concentration according to its response. Residues from meat of fish, shrimp, and fruits were mashed and added to the clean water. The water samples were stored at 35 °C for natural decay. Initially the bacteria concentration was below 100 colony forming unit per ml (cfu/ml), then it increased to103 cfu/ml in 2 h and 105 cfu/ml in 4 h, which was beyond the drinking safety standard, 500 cfu/ml. At this gas level no bad odor can be sensed by human yet, however, the effective ammonia concentration of those samples rises to 300–500 ppb in 2 h. The amine gas sensor can therefore be used as a rapid check if the bacteria level inside the water is far over the safety standard.

Original languageEnglish
Article number339729
JournalAnalytica Chimica Acta
Publication statusPublished - 2022 May 8


  • Amine gas sensor
  • Bacteria
  • Bad odor
  • Household wastewater
  • Water quality

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Spectroscopy
  • Environmental Chemistry


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