叙述了水体中含氮类污染物的来源、种类、相互转化方式和条件、表征意义等，以便对水中氮类污染物有一个全面、 系统的认识。
The sources, kinds and the exchanging conditions of the nitrogen pollutants in water are related. This make the recognization of the nitrogen pollutant systematic and comprehensive.
在研究膜污染时，实验采用膜抽吸压力的上升速率表征运行过程中膜过滤性能的变化。
When studying membrane fouling, the increasing rate of suction pressure of membrane was used to evaluate the membrane filtration characteristics of membrane bioreactor process.
以磷钨酸、草酸铵、二氧化钛三种物质组成三元混合光催化剂体系，用甲基橙为模拟污染物表征该体系的光催化降解活性。
The photocatalytic degradation activities of titanium dioxide composite system modified by phosphotungstic acid/ammonium oxalate using methyl orange as model pollutant were studied.
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