详细分析了形成亚硝酸盐积累的原因。
试验结果表明：通过高浓度游离氨对硝化菌选择性抑制所获得的亚硝酸盐积累是不稳定的；
The experimental results showed that the nitrite accumulation obtained from selective inhibition of high concentration free ammonia to nitrifier was unstable.
虽然无机氨和亚硝酸盐很容易与“生物过滤”管理的许多有机化合物往往积累抗微生物降解。
While inorganic ammonia and nitrite are easily managed with "biological filtration" many organic compounds tend to accumulate resisting microbial degradation.
在收获期绿色烟叶和烘烤前期，没有或含有少量的亚硝酸盐，亚硝酸盐在烘烤期逐渐增加并且与TSNA的积累正相关。
Nitrite is present in very small amount in a green leaf at harvest and during the early days of curing, but increases during tobacco curing and has been positively correlated with TSNA accumulation.
合适浓度的FA有助于亚硝酸盐的积累，但是，由于硝酸菌能够对FA产生的抑制作用逐渐适应，单纯靠增加FA浓度来实现硝酸盐的积累是不稳定的。
However, as nitrobacteria can gradually adapt the inhibition caused by FA, however, it is not stable enough to achieve nitrite accumulation merely depending on the increase of FA concentration.
合适浓度的FA有助于亚硝酸盐的积累，但是，由于硝酸菌能够对FA产生的抑制作用逐渐适应，单纯靠增加FA浓度来实现硝酸盐的积累是不稳定的。
However, as nitrobacteria can gradually adapt the inhibition caused by FA, however, it is not stable enough to achieve nitrite accumulation merely depending on the increase of FA concentration.
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