【摘要】 对东江东莞河段上覆水及底泥氮素的分布特征进行研究.采用室内土柱模拟实验方法,分析水体中和底泥-水体中氮素的转化过程,探讨环境因素对水体中氮素迁移转化的影响.试验结果表明,东江东莞河段总氮质量浓度范围为2.13~4.48mg/L,硝酸盐氮是主要的污染物存在形态,占总氮的64.9%;沉积物是水体氨氮的源,是酸盐硝氮和亚硝酸盐氮的汇;光照和扰动都能够降低氨氮的质量浓度;温度和初始pH值越高,越有利于氨氮的转化.更多还原

【Abstract】 This paper studies the nitrogen distribution in overlying water and sediment in the Dongguan segment of Dongjiang River.The indoor column experiment of nitrogen exchange between overlying water and sediment was conducted,and the influential factors on the nitrogen migration were investigated.The results indicated that TN concentration ranged from 2.13 to 4.48mg/L,and nitrate was found to be the main form of contaminant,which accounted for 64.9% of TN.Sediment is an important source for ammonium and a sink for nitrate and nitrite.Illumination and disturbance are conducive to decrease the concentration of ammonia nitrogen;and higher temperature and initial pH value are conducive to the transformation of ammonia nitrogen.更多还原