硝酸钠

Among these, sodium nitrite is a known carcinogen.

其中，亚硝酸钠是已知的致癌物质。

Main business scope: polyformaldehyde methylal methanol sodium nitrite sodium sulfide protopine xylene glacial acetic acid soda ash Ethyl acetate ion-exchange membrane caustic soda Chloromethane AEO-9 polyethylene glycol and other major raw materials and products.

多聚甲醛甲醇甲缩醛亚硝酸钠硫化碱片碱二甲苯纯碱冰醋酸醋酸乙酯离子膜烧碱 AEO-9 氯甲烷聚乙二醇等主要原料和产品。

In this paper, A new controlled depolymerization to chitosan-oligosaccharide from chitosan by nitrous acid is presented.

本论文研究了盐酸-亚硝酸钠对壳聚糖的可控性降解及降解产物壳低聚糖的若干应用。

This method is based on the diazotization of sulfadiazine with sodium nitrite in acidic medium and the coupling reaction with α-naphthylamine.

在盐酸介质中，利用磺胺嘧啶－亚硝酸钠－α-萘胺的重氮化－偶合反应，建立了流动注射光度法测定磺胺嘧啶的新方法。

The appropriate temperature of diazotization was-10～-5℃,and the diazotizating fluoborate was decomposed in petroleum ether to get 2-chloro-3-fluoropyridine with 64% yield.

以2-氯-3-氨基吡啶为原料，在40%的氟硼酸溶液中，采用饱和的亚硝酸钠为重氮化剂，在-10~-5℃下进行重氮化反应制得重氮盐，在石油醚中热分解得到2-氯-3-氟吡啶，收率为64%。

This specific preparation methods including: parathion of the initial reaction in acid and zinc metal in the common under redox reaction, a product of the reduction of parathion - parathion, with the sodium nitrite in the cold under diazotization reaction, and bovine serum protein tyrosine on the o-hydroxy combination of the adult immune original and immune rabbit polyclonal antibody preparation.

本发明制备方法具体包括：以对硫磷为反应初始物，在酸和金属锌的共同参与下进行氧化还原反应，得对硫磷还原产物对氨基对硫磷，再与亚硝酸钠在低温下进行重氮化反应后，与牛血清蛋白酪氨酸上羟基的邻位结合，制备成人工免疫原，并免疫新西兰大白兔制备多克隆抗体。

The composite of magnesite with NaNO〓 is the best for producing the SHS fettling materials.

对于制作SHS补炉料来讲，选择菱镁矿与硝酸钠作复合供氧剂效果最好。

The whole sintering process of SHS converter fettling materials can be divided into three steps. The first step is the decomposition reaction of carbonates and sodium nitrate, which is an endothermic reaction. The second step is the SHS reaction, i. e. thermite reaction, the metal of Al reacts with CO〓, O〓, NO〓, Fe〓O〓 to form Al〓O〓. The speed of thermite reaction is very quick, and accompanied with large amount of heat emission and temperature rise. The third step is the reaction of spinels formation. The Al〓O〓 produced by SHS reacts with MgO to form spinels.

整个SHS补炉料的烧结过程分三步进行：第一步为碳酸盐、硝酸钠的分解反应，属于吸热反应；第二步为SHS反应即铝热反应，金属铝粉与CO〓、O〓、NO〓、Fe〓O〓等反应生成Al〓O〓，反应速度很快，并伴随有巨大的放热和温度升高；第三步为合成尖晶石的反应，SHS反应产物Al〓O〓与MgO反应生成尖晶石。

MATERIALS AND METHODS: The root tips of Vicia faba were treated with different concentrations of sodium sulfite and sodium nitrite (in the concentrations of 25;50;100;200;400 mg/L) with distilled water as control for four hours.The root tips of Vicia faba were stained with carbol fuchsin and examined. The micronucleus rate and the rate of chromosome aberration were determined within root tip cells of Vicia faba.

材料与方法：用不同浓度的亚硫酸钠和亚硝酸钠(25、50、100、 200、400 mg/L)分别处理蚕豆根尖4 h，并以蒸馏水作为对照，用石炭酸品红染液染色，分别观察、测定蚕豆根尖细胞的微核率和染色体畸变率。

The glassiness barrier layer mixes glass dust and mill addition into slip glaze, 50-180 um barrier layer is prepared by painting slip glaze on the surface of stainless steel, components of the glass dust according to the percent by weight comprises SiO2 37-40, B2O3 11-14, one or two kinds of Na2O and K2O18-20, one or two kinds of BaO and SrO 3.5-6.5, one or two kinds of Al2O3 and Cr2O3 2.5-10.5, one or two kinds of residues such as CaO, CaF and Na3AlF6, and the mill addition comprises agglomerants such as kaolin, borax, sodium nitrite and the like, adhesive agents such as CMC, PVA and the like and water.

该玻璃质壁垒层是将玻璃粉和磨加物混合成釉浆，涂在不锈钢表面制备50-180μm涂层，玻璃粉的成分按重量百分比：37-40 SiO 2 ，11-14 B 2 O 3 ，18-20 Na 2 O、K 2 O中的一种或两种，3.5-6.5 BaO、SrO中的一种或两种，2.5-10.5 Al 2 O 3 、Cr 2 O 3 中的一种或两种，余量CaO、CaF、Na 3 AlF 6 中的一种或多种；磨加物包括高岭土、硼砂、亚硝酸钠等粘结剂、CMC、PVA等密着剂和水。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。