用硝酸处理

With the use of an additive and treatment of technical phosphorus by dilute nitric acid, the arsenic content in the phosphorus can be reduced from 19010-6 to 3.010-6, thus 95% of arsenic is removed.

通过使用添加剂，用稀硝酸溶液处理工业黄磷，可使黄磷中砷含量由190×10－6降至3.0×10－6，脱砷率达95％。

Experimental results show that hydrogen can be produced by the reaction between nitric acid with a given concentration and aluminum handled by means of mercuric bichloride solution under room temperature. Whereas hydrogen is not detected without aluminum handled by mercuric chloride solution.

研究发现，室温下用去膜并经氯化汞溶液处理过的铝箔与一定浓度的稀硝酸作用可产生氮气，而未经氯化汞溶液处理的铝箔与稀硝酸作用几乎检测不到氮气的生成。

Fluorine and phosphorus were measured with electrochemical analysis and spectrophotometry;the ratio of F to P was calculated.

清除结石，用优级纯硝酸冷消化处理后，分别采用电化学分析法和分光光度法测定离体牙氟和磷的含量并计算氟磷含量比。

According to the problem of the long processing time and testing cycle for food measurement, the feasibility of using one microwave digestion solution to investigate seven elements in food was discussed.

摘 要：针对食品检测前处理时间和检测周期过长的难题，用硝酸及双氧水作为消解溶剂，在设定的微波消解条件下，可以将样品消解完全，消解液中加入硫脲和L盐酸，不需任何处理可直接进行砷等7种元素的测定。

The present invention adopts the technical proposal of adopting ZSM-5 mesoporous molecular sieve raw powder with a silicon-aluminum mol ratio SiO2Al2O3 of 20 to 1000 and a weight percentage of 20 to 100 percent as well as at least one caking agent selected from SiO2, clay and Al2O3 to extrude, tablet or spray into shape; then treating for 1 to 8 hours by 0.1 to 3 mol/l of at least one ammonium liquor from ammonium nitrate, ammonium chloride or ammonium sulphate or 0.1 to 8.5 mol/l of at least one acid liquor from muriatic acid, nitric acid, vitriol or acetic acid under a temperature of 20 to 90 DEG C; then using steam to treat for 2 to 15 hours under the temperature condition of 400 to 700 DEG C; using a liquor of 0.1 to 3mol/l selected from at least one of oxalic acid, citric acid or maleic acid under a temperature condition of 20 to 90 DEG C to dip for 2 to 5 hours to obtain the modified molecular sieve catalyst, thus better solving the problems.

本发明通过采用硅铝比SiO2/Al2O3为20～1000重量百分比计20～100％的ZSM-5介孔分子筛原粉与余量的选自SiO2、粘土或Al2O3中至少一种粘结剂挤条、压片或喷球成型；再经过0.1～3摩尔/升选自硝酸铵、氯化铵或硫酸铵中的至少一种铵溶液或0.1～8.5摩尔/升选自盐酸、硝酸、硫酸或乙酸中的至少一种酸溶液在温度20～90℃下处理1～8小时；然后在温度为400～700℃条件下水蒸汽处理2～15小时；再用0.1～3摩尔/升选自草酸、柠檬酸或马来酸中至少一种在温度为20～90℃条件下浸渍2～5小时得所需改性分子筛催化剂的技术方案较好地解决了该问题，可用于甲醇转化制丙烯的工业生产中。

The mixed solution of sodium nitrate and aluminium nitrate is added to thequartz raw materials, and then the mixture, is.

在石英玻璃原料中加入一定浓度的硝酸钠和硝酸铝混合溶液，进行高温处理，使石英中杂质转变成易溶于混合酸或水的物质，实现了杂质与石英基体的分离，从而达到用低纯度的石英原矿生产高纯度的石英玻璃原料的目的。

Treatment of aquaculture wastewater by the biological film process;2. This research deals with the potential of nutrient removal from the aquaculture wastewater using a novel filter media vesuvianite and the macroalga Chondrus ocellatus.

用一种新型的火山石生物膜载体和大型海藻角叉菜Chondrus ocellatus处理牙鲆Paralichthys olivaceus 养殖废水，探讨了火山石生物膜载体和角叉菜对去除废水中总氨氮、硝酸态氮和磷酸盐的处理效果。

In this thesis,MWNTs were modified firstly using concentrated acid of H_2SO_4 and HNO_3,and then octadecyl isocyanate was grafted onto the surface of the MWNTs to improve the dispersion and the interaction between the filler and the matrix.

第一步，用浓硫酸和浓硝酸的混合液对MWNTs进行酸化处理，第二步，用廉价的十八烷基异氰酸酯对酸化过的MWNTs进行烷基化处理。

New variants of some plant viruses have been produced artificially in the laboratory by treating pure virus strains with mutagens.

用亚硝酸之类的诱变处理纯病毒株系，能在实验室内人为地使有些植物病毒产生新变种。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。