环境分析

文献中提到含氧量为21%，相对应的DO值应该怎么算呀？

您说的含氧量是在这一段吗？
μmax and KDO for each isolate were determined by a protocol described previously (Park and Noguera 2004). Briefly, this method used a set of eight serum bottles containing different oxygen levels (0%, 0·3%, 0·6%, 1%, 2%, 5%, 10%, 20% O2 in the gas phase) and a multi-magnetic stirrer to grow AOB simultaneously and estimate specific growth rate (μ, day−1) for different DO concentrations (i.e. different serum bottles). For each serum bottle, the changes in NH3 and AOB biomass (X) were simulated using Eqns (1) and (2):
首先在文章中提到了用到的DO为0.12-0.24ppm，在文章的第一段ammonia-oxidizing bacteria enrichment and isolation中第一句话就介绍了 gas cylinders (AGA) 用的O2 为0.3or 0.6% DO wei 0.12-0.24ppm,如果要看文献的话请好好阅读其中的内容并前后联系。
另外我也在做AOB NOB数学模型的研究，感谢你提供这篇文献。

纯氧气的饱和DO值也就几十ppm 吧，一下子来个21%，看不懂，请把问题说全了。

DO=(468)/(31.6+t)
t：水温

21%是指空气中氧气占的体积百分比。
这时候的DO一般默认为饱和值，即100%。

DO仪器校准时候是以空气在水中的溶解氧为标准的啊