Indicative function of hydrogen and oxygen stable isotopes on the water environment of Dongping Lake during dry period
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Abstract:
To learn about the quality of water environment o f Do ng ping Lake in dr y perio d, w e collected hydro gen and ox yg en stable isoto pes samples and analyzed the distributio n of hydro gen and o x yg en isoto pes, deuterium surplus, and eutro phicatio n co nditions in Dongping Lake. We revealed the effect of evapor ation and human factors on w ater quality during dr y period. T he results showed that: ( 1) The sing le2facto r ev aluatio n showed serious eut rophicatio n in Do ng ping Lake during dry period. T he averag e concentr atio ns of COD, TN and TP in Dong ping Lake w ere 161 92 mg / L, 01 80 mg/ L and 01 31 mg / L, respectiv ely . They wer e close to heavy eutr ophicatio n in the dry period. ( 2) The spatial distribut ions of DD and D18O showed a g radual increasing trend from t he southeast to the northw est o f t he lake area, w hile the d value showed an o pposite distribution tr end to that o f DD and D18O. T he d value o f lake wat er is negative between - 41 77 j and - 121 48 j , indicat ing that the eva po ratio n of water is st rong . ( 3) In the dry period,D18O and DD of lake w ater showed a sig nificant correlat ion w ith the COD, pH and EC, w hich re2 flect ed the effect o f evapor ation fr actionatio n o n the content of COD. Howev er, TN and TP had no significant co rr elatio n with DD and D18O iso topic values because the co ntent of T N and TP w as affected by human facto rs.
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