Metasystox-R is a systemic soluble liquid insecticide
for the control of aphids on brassica vegetable crops, cotton and lupins
and it is possible enter to the marine environment and may be have a hazard
effects for the marine organisms and nitrification processes. Effect of
Metasystox-R on ammonia oxidizing activity by marine Nitrosomonas
sp. was investigated by determining nitrification inhibitor assay in the
cell suspension. Results showed that 8 μg mL-1 of Metasystox-R
with PI50 = 4.48 significantly inhibited nitrite production
by marine Nitrosomonas sp. These results suggested marine Nitrosomonas
sp. may be one of the target bacteria which was inhibitor and decreasing
nitrification in the marine environment.
Key words: Metasystox-R, nitrification inhibitors,
marine Nitrosomonas sp.
]]>