Inhibition of Chemoautotrophic Nitrification by Sodium Chlorate and Sodium Chlorite: a Reexamination
AUTOR(ES)
Hynes, Russell K.
RESUMO
The oxidation of NH4+ by Nitrosomonas europaea was insensitive to 10 mM NaClO3 (sodium chlorate) but was strongly inhibited by NaClO2 (sodium chlorite; Ki, 2 μM). The oxidation of NO2− by Nitrobacter winogradskyi was inhibited by both ClO3− and ClO2− (Ki for ClO2−, 100 μM). N. winogradskyi reduced ClO3− to ClO2− under both aerobic and anaerobic conditions, and as much as 0.25 mM ClO2− was detected in the culture filtrate. In mixed N. europaea-N. winogradskyi cell suspensions, the oxidation of both NH4+ and NO2− was inhibited in the presence of 10 mM ClO3− after a 2-h lag period, despite the fact that, under these conditions, ClO2− was not detected in the filtrate. The data are consistent with the hypothesis that, in mixed culture, NH4+ oxidation is inhibited by ClO2− produced by reduction of ClO3− by the NO2− oxidizer. The use of ClO3− inhibition of NO2− oxidation in assays of nitrification by mixed populations necessitates cautious interpretation unless it can be shown that the oxidation of NH4+ is not affected.
ACESSO AO ARTIGO
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