Distribution of inorganic nitrogen in a reservoir in Tianjin
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Abstract:
Taking a reservoir in Tianjin as the research object, the distribution law of inorganic nitrogen indifferent seasons and the correlation of reservoir water environmental factors were analyzed, and the morphological changes of inorga nicnitrogen were discussed. The results show that the temperature of the reservoir was lower than that of the inlet and outlet . The dissolved oxygen mass concentration was hig her in the inlet water than in the outlet water, and the dissolved oxygen content was highest in the middle position. In summer, ORP w as lower than in autumn, while stronger the oxidization and the nitrification, and lower the ammonia nitrogen mass concentration. The T DS decreased with the increase of depth, the water outlet was closer to the coast , and the TDS of water was higher. The pH was higher in autumn than in summer. The west bank of NH3-N was higher than the east bank, and the mass concentration in the inlet direction was higher than that in the outlet direction. The mass concentration of NO2-N decr eased with the increase of depth at most of the sites, and the salinity showed a significant positive correlation with NO2-N. The main form of inorganic nitrogen as nitrate nitrogen, whose mass concentr ation was higher at the outlet compared to the inlet. Ammonia nitrogen and nitrate nitrogen mass concentration were spring> summer> autumn, respectively. Dissolved inorganic nit rogen( DIN) was mainly nitrate nit rogen, acco unting for 81.97% on aver age.
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