Online monitoring technology for algae by fluorescent sensing method.

Water quality eutrophication and breakout of water bloom in lakes and reservoirs have already become a major environmental concern.To analyze the ecological mechanism of breakout of water bloom,to understand the generating and vanishing process of water bloom and to achieve an early warning of water bloom,the effective monitoring of the population structure of planktonic algae during breakout of water bloom is essential,which mainly includes species composition and quantitative variation of planktonic algae.Based on sensing method of fluorescence in vivo,embedded control technology and real-time data acquisition technology,this paper proposes a design of online fluorometer for algae.The fluorometer for algae can be used to measure the content of different spectral groups of algae(blue algae,green algae and brown algae) in vivo and in situ.The results of comparative experiments show that the measurement errors of blue algae,green algae and brown algae are less than 17.88%.Field experiments in Caohu show that fluorometer has a good stability.The fluorometer with a good performance would have further potential applications in environment monitoring,water bloom early-warning and evaluation of lake eutrophication.