氟化硅

Large single crystals were also obtained by using pyrocatechol as additive. It was shown by 〓Si-NMR and IR that Sipyrocatechol complex was formed in the reaction system.

在F〓体系中，F〓对铝源和硅源起络合和矿化作用，形成可溶性氟硅酸盐AlF〓〓、SiF〓〓络合物，然后缓慢水解成含氧氟硅酸盐络合物，它们再发生定向缩聚，提供了分子筛晶体生长所需的可溶性结构单元。

Element analysis shows that Si exists on the surface of hybrid membrane when TEOS content is not too low. The effects of TEOS content on the performance of hybrid membranes were investigated.

实验初步考察了正硅酸乙酯的添加量对聚偏氟乙烯－硅杂化膜的超滤性能和力学性能的影响，对杂化膜进行了能谱分析。

The purification-pretreatment technique of 8 kinds of solid phase extracting column stuffing (silica gel, acid silica gel, Florisil, siliceous magnesium sorbent, Al2O3, celite 545, acid celite, Al2O3+silica gel) for the prepared polluted soil containing 13 kinds of organochlorine pesticides (α-HCH,β-HCH,γ-HCH,δ-HCH, o,p'-DDT, o,p'-DDE, p,p'-DDT, p,p'-DDD, p,p'-DDE, a-endosulfan, dieldrin, endrin, hexachlorobenzene) was screened prior.

用製备的8种固相萃取柱填料（硅胶，酸化硅胶，氟罗里硅土，硅镁型载体，Al2O3，硅藻土载体545，酸性硅藻土，Al2O3+硅胶）对含有13种有机氯农药的污染土壤的纯化预处理技术进行了优化筛选。

Water samples were extracted and purified and collected by solid-phase extraction LC-18 column. Soil samples were extracted by ethyl acetate/petroleum ether (2:1, by vol) and purified by sulphonation. Wheat sample was extracted by acetonitrile/water (4:1, by vol) and purified and collected by SPE- Florisil column.

水样直接用LC-18固相萃取小柱分离、净化和富集；采用乙酸乙酯／石油醚（体积比2：1）振荡提取，磺化法净化，测定土壤中氯氟吡氧乙酸残留量；以乙腈／水（体积比4：1）为提取剂，氟罗里硅土固相萃取小柱分离、净化，测定小麦样品中氯氟吡氧乙酸的残留量。

Melting point 3410 ℃, boiling point 560 ℃, relative density of 1935, F the external electronic structure of 5d46s2, in the chemical reaction time is very easy to lose 1-6 electronic, but also can get 1-2 electronic, so oxidation number of 0,± 1,± 2, 3, 4 , 5 and 6, with 6 price of the most stable compounds, such as WO3 does not dissolve in water, the air will form in the tungsten trioxide thin protective layer of tungsten, tungsten with fluorine at room temperature, chemical combination, red hot when there is no moisture and Bromine iodide together, red hot when you can and water reaction WO3, at room temperature reaction of tungsten with aqua regia, but the hot concentrated hydrochloric acid and sulfuric acid can only be played with its weak response, but molten nitrate, nitrite, too Hydrogen peroxide, sulfur steam, steam and other phosphorus can play intense reaction, high temperature can not be carbon, boron and silicon reaction of binary compounds, widely used in industrial tungsten steel and tungsten carbide, pure tungsten filament is used to the system, and X-ray tube Tube heating components, semiconductor components can be prepared tungsten silicide, tungsten industrial production is white or black tungsten ore tungsten ore refining.

熔点3410℃，沸点560℃，相对密度1935，F外围电子结构为5d46s2，在化学反应时很容易丢掉1—6个电子，也能得到1—2个电子，所以氧化数为0、±1、±2、＋3、＋4、＋5和＋6，以＋6价化合物最稳定，如WO3不溶于水，空气中的钨会形成薄层三氧化钨保护层，钨能与氟在室温下化合，红热并无潮气时能与溴、碘化合，红热时还能和水反应生成WO3，室温下钨可与王水反应，但热的浓盐酸和硫酸只能与其起微弱反应，但对熔融的硝酸盐、亚硝酸盐、过氧化氢、硫蒸汽、磷蒸汽等能起激烈反应，高温下不能与碳、硼和硅反应生成二元化合物，工业上广泛使用钨钢和碳化钨，纯钨用来制灯丝、电子管和X射线管的发热元件，硅化钨可制半导体元件，钨工业生产是将白钨矿石或黑钨矿石精炼。

After the waste catalyst sample during silicon coupling agent synthesis was pretreated with this method, the platinum in sample was determined by tin dichloride spectrophotometry.

硅偶联剂合成中废催化剂样品用本方法处理后以氟化亚锡分光光度法测定铂含量，分析值重现性好。

The results demonstrate that the DO obstructs the silica etching but facilitates the silicon etching in ammonium fluoride solution.

结果表明溶解氧阻碍二氧化硅在氟化铵溶液中的腐蚀、而加快硅的腐蚀。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。