渭河陕西段底泥间隙水与上覆水中污染物分布特征研究

通过渭河8个断面2015年4月和9月的采样分析,探讨了表层底泥间隙水和上覆水中污染物的分布特征,并对间隙水和上覆水中的污染物浓度进行了相关性分析。结果表明:在丰水期时上覆水中TN、NO_3—N、NH_3—N及COD含量均高于平水期,其中采样点D5(泾河汇入前渭河干流处)的污染物含量很高;间隙水中TN、NH_3—N、NO_3—N变化趋势相似,丰水期TN、NH_3—N、NO_3—N含量均高于平水期含量,采样点D5、D7(泾河汇入后干流处)丰水期总磷、COD含量很高;相关性分和上覆水中TN、COD浓度在丰水期高度相关,说明间隙水中TN、TP、COD的浓度是其上覆水中TN、TP、COD浓度的决定因素。

The distribution feature of the pollutants in sediment pore water and overlying water of Shaanxi segment in Weihe River

Through twice sampling collections of eight sections of Weihe River in April and September, 2015, the distribution feature of the pollutants in surface sediment pore water and overlying water was analyzed, the correlation between the concentrations of the pollutants in surface sediment pore water and that in overlying water was conducted. the results showed that, the concentrations of TN, NO₃-N, NH₃-N and COD in the overlying water of the wet period were all higher than those of the level period, of which D5 (before Jinghe River flows into Weihe River) had high concentrations of pollutants. The concentrations of TN, NH₃ - N and NO₃ -N in pore water had similar change trend, TN, NH₃ - N and NO₃ -N of wet period were higher than those of the level period, TP and COD had high contents in D5 and D7(after Jinghe River flows into Weihe River) for the wet period. The correlation analysis showed that, the TN, TP and COD concentrations in surface sediment interstitial water were significantly correlated with the TN, TP and COD concentrations in overlying water in the level period, and were highly correlated in the wet period, which indicated that the concentrations of TN,TP and COD in pore water determinants the concentrations of TN,TP and COD in the overlying water.