三氧化钨

In the presence of the combination of sulphuric and phosphoric acid, with sodium diphenylamine sulfonate as the indicator, standard solution of potassium dichromate was used to titrate total iron value.

试样以盐酸溶解后，在酸性介质中，先以氯化亚锡将三价铁大部分还原为二价，然后在钨酸钠指示下，再以三氯化钛将剩余的三价铁还原为二价，过量的三氯化钛以重铬酸钾氧化消除干扰，在硫磷混合酸存在下，以二苯胺磺酸钠为指示剂，用重铬酸钾标准溶液滴定全铁量。

Now, Anda products mainly include sodium tungstate, ammonium metagungstate, ammonium paratungstate, ammonium dimolybdate, ammonium quartmolybdate, ammonium heptamolybdate, ammonium molybdate, molybdenum, barium molybdate pure molybdenum trioxide, etc. All of these products have the stable market domestically which are also sold to more than ten regions and countries abroad including west countries, Southeast Asia and Japan. Anda also becomes the special factory of molybdenum series products in foreign trade.

目前安达产品主要包括钨酸钠、偏钨酸铵、仲钨酸铵、二钼酸铵、四钼酸铵、七钼酸铵、钼酸钠、钼铁、钼酸钡、高纯三氧化钼等，这些产品除在国内有稳定的市场外，还远销欧美、东南亚以及日本等十多个地区和国家，公司也成为外贸钨钼系列产品的定点厂家。

Typical application: Co-WC powder, chrome oxide powder, Lead sesquioxide powder, Chromium carbide powder, zirconium oxide powder, Ni Base Alloy-Chromium Carbide,etc.

典型应用：钴碳化钨粉、氧化铬粉、三氧化二铅粉、碳化铬粉、氧化锆粉、镍铬碳化铬粉、钴铬铌钇粉等。

The synthesis of azelaic acid through oxidation of ol eic acid with 50% aqueous hydrogen peroxide has been studied by using catalyst containing tungsten and phase transfer catalyst .

以 5。 0 %过氧化氢为氧化剂，钨化合物为催化剂，在三辛基甲基氯化铵和双十八烷基二甲基氯化铵为相转移试剂的条件下，考察了油酸氧化制备壬二酸的催化反应活性。

Based on the analysis of organic geochemical characteristics, Inorganic geochemical exploration methods and nano-geochemical exploration methods were adopt to research geochemistry on the surface above the Xin Chang gas field,and it is discovered there is abnormity of trace element ,for example , Cu、Zn、Ni、V、Fe_2O_3、Ba、W、Sb、Ag、Y、Zr、La and Ba、Sr、Ti、Cu、Zn、Ni、Al、P、La series、Y、Co、W、Ag、Nb、Tl ect, showing the top effects and chimney effects,which is important to indicate gas reservoir.

本文以有机地球化学特征分析方法为基础，采用无机地球化学勘探方法和纳米级地球化学勘探方法对新场气田上方地表无机地球化学和纳米级地球化学特征进行综合研究，发现了无机微量元素铜、锌、镍、钒、三氧化二铁(Fe_2O_3)、钡、钨、锑、银、钇、锆、镧等及纳米级微量元素钡、锶、钛、铜、锌、镍、铝、磷、镧系除钷(Pm、钇、钴、钨、银、铌、铊等元素在气田上方异常特征呈现顶端效应或烟囱效应，该类元素对气田的勘探具有重要的指示意义。

Copper reagent silver method ; colorimetric determination ; tungsten trioxide ; Arsenic

铜试剂银法；比色测定；三氧化钨；砷

The method is completed at a room temperature, and does not require subsequent heating treatment; and the tungsten trioxide (WO3) nano film prepared is strongly oriented along the [002] crystallographic direction, namely the WO3 nano film is spread along an ab plane and a c- shaft is the film thickness direction.

本发明的方法在室温下完成，无需后续加热处理，所得的三氧化钨(WO 3 )纳米薄膜沿[002]晶向强烈取向，即所得的WO 3 纳米薄膜沿ab平面铺展，c-轴为膜厚方向。

The flame retardant molding compositions include an epoxy resin; a first transition metal oxide containing a refractory metal, such as tungsten trioxide; and a second transition metal oxide containing an oxyanion of a Group VIA element and a cation of a Group IIA element, such as calcium molybdate.

该阻燃模塑组合物包括环氧树脂、含高熔点金属的第一种过渡金属氧化物如三氧化钨；和含VIA族元素的含氧阴离子和IIA族元素的阳离子的第二种过渡金属氧化物如钼酸钙。

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。