Ref ID : 1091
Inamori Yuhei, Suzuki Rie, and Sudo Ryuichi; [Effect of heavy metals on the specific growth rate of metazoa isolated from sludge and bio-film]. Res.Rep.Natl.Inst.Environ.Stud.,Jap. 47:139-152, 1983
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After growing mass and monoxenic cultures of three species of small metazoa, Nais sp., Aeolosoma hemprichi and Philodina sp. using sterilized activated sludge as the metazoan food, the effect of these metals on the specific growth rate of each metazoa was examined. EC50 (effective concentration) was used to define the metal concentration required to reduce the specific growth rate of metazoa to one half of that of a control. The EC50 were: 0.9 mg/l (A. hemprichi), 1.3 mg/l (Nais sp.) and 5.4 mg/l (Philodina sp.) for copper, 0.04 mg/l (A. hemprichi), 0.03 mg/l (Nais sp.) and 1.4 mg/l (Philodina sp.) for hexavalent chromium, 3.4 mg/l (A. hemprichi), 4.3 mg/l (Nais sp.) and 9.2 mg/l (Philodina sp.) for zinc, 14.0 mg/l than 102.4 mg/l under pH adjusted (A. hemprichi and Nais sp.) for alminium and iron. It was noted that concentrations of these metals determined from the influent of domestic sewage treatment plants were apparently less than values of EC50 mentioned above.