ammonia nitrogen concentration 氨氮浓度 ; 氨态氮浓度 ; 氨态氮浓度 total nitrogen concentration 总氮含量 ; 总氮浓度 nitrogen concentration in atmosphere 大气氮含量 ..
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The results indicate the maximal relative error between simulation values and observation values of total nitrogen concentration is 11.67%.
结果表明，地下水总氮含量模拟值与实测值最大相对误差11.67%。
The COD, ammonia and total nitrogen (TN) removal efficiency were studied in the paper at low DO concentration in a pilot-scale A/O nitrogen removal plant treating domestic wastewater.
应用A/O中试装置处理实际生活污水，研究了低DO浓度下系统对有机物、氨氮和总氮的去除效果。
The effect of nitrogen on growth, total alkaloids concentration and total alkaloids yield of Sophora flavescens was studied.
结果表明，施用氮肥对苦参生长以及苦参总碱含量均有显著促进效应。
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