Rapid evaluation of algal and cyanobacterial activities through specific oxygen production rate measurement

摘要: Abstract Extant respirometry enables rapid determination of sludge decay coefficients and chemical biodegradability in wastewater treatment systems. This study extends its use to phototrophic systems determine rate photosynthetic activity through the measurements specific oxygen uptake (SOUR) production (SOPR), respectively. With a sufficient CO 2 supply (4.0 mM NaHCO 3 ) pH control (from 7 8) at light intensity 50 ± 5 μmol m −2  s −1 temperature 23 ± 1 °C, growth rates cyanobacteria ( Microcystis aeruginosa green algae Chlorella vulgaris were 0.92 ± 0.11 0.79 ± 0.14 d , The M. C. 0.08 ± 0.04 0.08 ± 0.03 d Compared batch studies that often last longer than 10 days, proposed SOPR measurement algal/cyanobacterial kinetics within minutes is capable determining under different environmental stress conditions (e.g., pH, nitrogen sources, metal exposure). As demonstrated here, ammonium was preferred source for because reducing power (energy) needed convert nitrate before by phototrophs. more susceptible inhibition heavy copper. At concentration 10 mg Cu 2+ /L, cupric ions had no effect on algal but inhibited cyanobacterial 66.4%.