亚硝酸

To oxidizeinto nitric acid,nitrous acid,or any nitrate or nitrite,especially by the action of nitrobacteria.

硝化将氧化成硝酸、亚硝酸或任何硝酸或亚硝酸酯，尤指通过硝化细菌的作用

To oxidize into nitric acid, nitrous acid, or any nitrate or nitrite, especially by the action of nitrobacteria.

硝化将氧化成硝酸、亚硝酸或任何硝酸或亚硝酸酯，尤指通过硝化细菌的作用

The way of high frequency intermittent aeration suppresses the activity of nitrobacteria, and also...

实验结果表明，高频间歇式曝气方式在抑制了硝酸细菌的活性的同时也消除了亚硝酸盐浓度和pH大幅波动对亚硝酸细菌和厌氧氨氧化细菌活性的影响；在曝气阶段，溶解氧浓度被控制在1.2～1.4mg·L-1，亚硝酸细菌成为主体细菌，亚硝酸盐积累；在缺氧阶段，随着溶解氧浓度迅速降低，厌氧氨氧化细菌成为优势菌种，曝气阶段积累的亚硝酸盐与氨氮同时被去除。

Nitrite oxidoreductase was responsible for the nitrification of nitrite-oxidizing bacteria, which was coded by norB gene and others.

硝化菌主要由两大生理群组成：氧化氨氮为亚硝酸盐氮的是亚硝酸菌；氧化亚硝酸盐氮为硝酸盐氮的是硝酸菌，硝酸菌中负责硝化作用的酶是亚硝酸氧化还原酶，这个酶由norB等基因编码，因而对这个酶和基因的研究将有助于氮污染的控制和防治。

A new fluotescence quenching method has been developed to determine nitrite in water samples. The method is based on the diazo-reaction between nitrite ion and thionine in dilute suifuric acid medium.

文章研究了在稀硫酸介质中亚硝酸根与硫堇发生的重氮化反应，基于硫堇的荧光强度随亚硝酸根的加入量增加而明显降低的现象，建立了荧光猝灭法测定痕量亚硝酸根的新方法。

The number of autoterophic bacteria were significantly lower than the heterotrophic bacteria. Majority of 21 strains of heterotrophic bacteria that isolated from water body were Pseudomonas. Majority of 25 strains of heterotrophic bacteria isolated from sediment were bacillus, microccus and Pseudomonas.Three genus of autotrophic bacteria were sulphuret bacteria, nitrify bacteria and nitrosobacteria that were capable of oxidizing H2S, S, FeS, oxidizing NH3 to NO2 and NO2 to NO3 respectively.

试验稚鳖池水中共分离出21株异养细菌，其中优势菌为假单胞杆菌属细菌；底泥中共分离出25株异养细菌，其中优势菌为芽胞杆菌属细菌，微球菌属细菌假单胞菌属细菌，三种自养细菌分别为具有氧化硫化氢、元素硫或硫化亚铁的硫细菌；具有氧化氨为亚硝酸的亚硝化细菌和能将亚硝酸进一步转化成硝酸的硝化细菌。

The effect of PPC preoxidation on nitrification was conducted by measuring the quantity of nitrite bacteria and nitrate bacteria ,nitrosification performance and nitrification performance in the BAC process.

结果表明，高锰酸盐预氧化后的生物活性炭与单独生物活性炭上亚硝酸菌和硝酸菌的分布具有相同规律；但高锰酸盐预氧化后生物活性炭工艺中亚硝酸菌和硝酸菌数量、亚硝化速度及硝化速度都要高于单独的生物活性炭，这是高锰酸盐促进后续生物活性炭工艺去除氨氮和亚硝酸盐氮的主要原因

Experimental results showed that, in this process, the optimal pH of the shortcut nitrification was 8.0～8.5; when the pH was less than 6,the nitrification is completely inhibited; when the pH was 6～7, at the end of aeration, the Nitrobacteria become the dominant bacteria because of the dropping of the free ammonia concentration. It is known to all, the activity of the Nitrobacteria and Nitrosomonas was affected by FA concentration, so nitrification was affected by FA concentration. According to the author's research results, the FA concentration which inhibit the Nitrobacteria was below 1.0mg/L,which inhibit the Nitrosomonas was above 10mg/L.

实验研究结果表明：本工艺中，短程硝化反应的最佳pH值在8.0～8.5之间，当pH小于6时，整个硝化反应都会受到抑制，当pH在6～7之间时，随着游离氨浓度的降低，在曝气后期，硝化菌将会占据优势；FA浓度对短程硝化反应的影响是通过对亚硝酸菌和硝酸菌的抑制来实现的，在本研究条件下，游离氨对亚硝酸菌的抑制浓度在10mg/L以上，对硝酸菌的抑制浓度在1.0mg/L以下；温度对短程硝化反应的影响是双重的，既影响微生物的生理活性，又影响FA浓度。

A fully automated simultaneous determination of nitrate and nitrite in water samples by sequential injection analysis based on the Griess diazo-coupling reaction and the formed azo dye for nitrite at 540nm and reduction to nitrite using coppered cadmium column.

用顺序注射分光光度法，通过一次进样。同时测定硝酸根和亚硝酸根。亚硝酸根是根据格里斯重氮－偶联反应，形成偶氮染料后在波长540nm下进行检测。而硝酸根则通过镀铜镉粒还原柱还原为亚硝酸根后进行测定。

One was that one molecule of nitrous acid di-rectly reacted with DMA,and the other was that two molecules of nitrous acid reacted first to yield nitrogen trioxide,which then reacted with DMA.

计算结果表明，DMA与亚硝酸间接反应的活化能比直接反应的低约55kJ/mol，由此可推断DMA与亚硝酸生成NDMA的反应是以两分子的亚硝酸先生成ONNO2再亚硝化DMA为主要反应途径。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。