Department of Environmental Science, Babasaheb Bhimrao Ambedkar University,
- 226 025, India
26 February 2011
The study was carried out to
determine the seasonal variation of nitrite levels in drinking and surface
waters of urban, peri-urban and rural areas of
Lucknow, during 2007-2008, and to evaluate the nitrite removal and accumulation
potential of certain native aquatic macrophytes.
Most of the drinking and surface water samples were collected from urbanized
region of the city. All drinking water samples detected, showed higher
nitrite level in winter, when compared with that in summer and rainy seasons.
However, in drinking water samples nitrite level was below the permissible
limit i.e. 3.29 mg l-1 NO2.
The surface water showed more than 3 fold higher
levels of nitrite over the permissible level i.e. 0.06 mg l-1, and the level was higher during
rainy season than in summer and winter seasons. Eight macrophytes
viz. Peltandra virginica,
Utricularia vulgaris, Eichhornia crassipes, Trapa natans, Mimulus glabratus, Marsilea quadrifolia, Pistia stratiotes and Polygonum persicaria
were studied for phytoremediation potential of
nitrite from the water under simulated laboratory conditions. The gradual
diminution in the level of nitrite in the water and simultaneously itís increase in the plant tissues was recorded at 5th, 10th
and 15th d after plant culture. All the
plants selected, removed nitrite from water but Polygonum
persicaria, Mimulus glabratus, Trapa natans and Pistia
stratiotes were found more efficient and
removed nitrite upto 60.91, 58.09, 60.97 and
72.28%, respectively. Observations revealed that Pistia
stratiotes can be used for the effective
removal of nitrite from the contaminated water.
Drinking water, Nitrite
level, Pistia stratiotes,
Surface water, Aquatic macrophytes
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