水-土体系中的反硝化作用——含氮化合物沿土壤剖面的分布及N2O的测定
DEVITRIFICATION IN THE WATER-SOLL SYSTEM -DISTRIBUTION OF NITROGEN COMPOUNDS ACROSS A CLAY SOIL PROFILE AND DETERMINATION OF NITROUS OXIDE
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摘要: 本文建立了GC/ECD测定氧化亚氮的方法;调查了干旱、半干旱地区化肥厂排放废水中含氮化合物沿粘土土壤剖面的分布规律;重点研究了在封闭体系内,氧化亚氮和亚硝酸盐氮的变化规律及诸因素对反硝化作用的影响.实验结果说明,氧化亚氮随时间的变化呈二次曲线关系,亚硝酸盐氮的生物降解符合一级反应动力学方程,在20℃下,半衰期为34小时.再次证明反硝化主要是生物作用,并在厌氧条件下进行.Abstract: A GC/ECD procedure for nitrous oxide determination was developed and applied to the study of the distribution of inorganic nitrogen compounds from fertilizer wastewater across a clay soil profile in arid and semi-arid areas. The transformation of N2O and NO2-N and the factors affecting denitrification were investigated as well. The results showed that a second order curve could fit the relation between N2O concentration and time quite well and the biological degradation of NO2-N followed a first order reaction pattern. The half-life of NO2-N was measured to be 34h at 20℃, indicating that anaerobic biological process plays a major role in denitrification.
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