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J.Health Sci., 50(6), 613-618, 2004
Effect of Rice Bran on the Growth Inhibition of
Selenastrum Capricornutum by Chlorine and Monochloramine
Atsuko Adachi,* Kazuyo Matsushita, Yoshiaki Yata, and Toshio Okano
Kobe Pharmaceutical University, Motoyamakitamachi 4-chome, Higashinada-ku, Kobe 658-8558, Japan
The effect of residual chlorine on the growth of
Selenastrum capricornutum was investigated by an algal growth
test to evaluate toxicity. Significant reductions in growth due to monochloramine were observed in the green alga,
Selenastrum capricornutum; however, algal growth was not inhibited in the medium containing rice bran because of
the disappearance of monochloramine. The removal of monochloramine by rice bran was attributed to the chemical's
decomposition by direct reaction with the rice bran. In contrast, no significant reduction in growth was observed in
the medium containing free chlorine. The decomposition rate of monochloramine was slower than that of free
chlorine in the medium.
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