查询词典 nitric acid

Low levels of the crust, melting point 3180 ℃, boiling point 5627 ℃, the relative density of 2053, the external F electronic structure 5d56s2, reaction time will be lost 1-7 electronic, but also can capture an electron, so oxidation number of 0,± 1, 2 , 3, 4, 5, 6 and 7, rhenium with the halogen in the fluorine, chlorine, bromine reaction halides dissolved in water, can dissolve in nitric acid and ammonia hydrogen peroxide solution, but do not dissolve in hydrochloric acid.

地壳中含量很低，熔点3180℃，沸点5627℃，相对密度2053，外围F 电子结构5d56s2，反应时会丢失1—7个电子，也可捕获一个电子，所以氧化数为0、±1、＋2、＋3、＋4、＋5、＋6和＋7，铼能与卤素中的氟、氯、溴反应生成溶于水的卤化物，能溶于硝酸和含氨过氧化氢等溶液，但不溶于盐酸。

In this thesis, the solution of Chinese reference materials including lithium, potassium, calcium, sodium, magnesium, was used to evaluate analytical methods applied. Lithium was enriched in different eluents (hydrochloric acid, nitric acid and mixture with ethanol or methanol) by cation exchange resin AG 50W-X8, and the optional experimental conditions were studied.

本文以锂元素标准样品和钾、钠、钙、镁元素标准样品的混合溶液为主要研究对象，采用阳离子交换树脂AG-50W-X8来分离富集锂，探索在不同淋洗介质(包括盐酸、硝酸以及与甲醇、乙醇的混合)条件下锂分离纯化的最佳介质条件。

Methods: The sample, after the nitric acid and the perchloric acid digestion was induced in the flame atom absorption spectrophotometer with standard series comparison quota.

样品用硝酸和高氯酸消化后，导入火焰原子吸收分光光度计中，与标准系列比较定量。

Our main production of iron oxide products, iron oxide red H110, H130, HO01-02, H190, iron oxide yellow G313, 313, 722 black iron oxide, iron oxide brown 842,7602, Green iron oxide, iron oxide-floor yellow, iron oxide 980,990, a number of varieties, a tin of raw materials, nitric acid, sulfuric acid oxidation and the second is made of high-quality paint. 980,990 iron oxide in response to short-iron through the burning and made of magnetic materials.

本厂主要生产氧化铁系列产品，氧化铁红H110、H130、HO01-02、H190等，氧化铁黄G313、313等、氧化铁黑722等、氧化铁棕842、7602、氧化铁绿、氧化铁兰、地板黄、980、990三氧化二铁等多项品种，原材料是以铁皮、硝酸、硫酸二次氧化而制成的具有高品质的颜料。980、990三氧化二铁是以纯铁粉通过反应短烧而制成的磁性材料。

Dunng precipitation, a certain amount of mineral acid such as nitric acid served as an additive, to adjust the precipitation and crystallization processes of cerium oxalates.

沉淀过程中，以一定数量的矿物酸如硝酸作为添加剂，来调整草酸铈的沉淀和结晶过程。

This paper repots a study of the adsorption behavior of silver on charcoal, reports a method for the decomposition of charcoal with sulfuric acid and nitric acid, and establishes a method for the preconcentration and determination of the sub μg/L level of silver in natural water.

本文研究了银在活性炭上的吸附行为，提出了以硫酸、硝酸反复交替炭化，消化彻底分解破坏活性炭的处理技术。建立了活性炭富集火焰原子吸收测定天然水中亚μg/L水平银的分析方法。

It is found that the "do-bads" is a mixture of long chain acid phosphate ester,oligomer of phosphate,and nitro, nitroso, nitric acid ester of tributyl phosphate.

并探讨了此类物质的分子结构，认为硝基、亚硝基、硝酸酯基因可连接于磷酸酯的烷基上，也可加成于磷氧双键上。

The conversion and selectivity of oxidation of 2-octano l to hexanoic acid by nitric acid using the mixed-addenda heteropolyacid H15- xPMoxV12-xO40·nH2O(n=20-40)as the catalys t were studied.

采用磷、钼、钒系列多元杂多酸作为硝酸氧化仲辛醇制己酸的催化剂，对其催化性能和选择性进行了实验研究。

At 80℃, the yield of esterification of benzoic acid with ethanol could reach 95% by using 10% catalyst for 6 h; the conversion of toluene in the nitration with 1 equiv. of 65% nitric acid could be achieved to 99% by using 5% catalyst for 5 h.

在80℃下，摩尔分数为10%的Yb(NTf2)3负载催化剂，反应6h可使苯甲酸乙酯的产率达95%；摩尔分数为5%的Yb(NTf2)3负载催化剂，反应5h可使甲苯与等摩尔质量分数为65%硝酸的硝化反应转化率达99%。

But on the other hand, it cannot be used for concentrated nitric acid, chrome acid mixture, chloric solution, aliphatic solution and balmy hydrogen etc..

但不适用于浓缩硝酸、铬酸混合物、含氯溶剂、脂肪族、芳香氢等介质液体的测量。

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。