用氟处理

To pretreatment human hair samples by burning oxygen bottles, with a total strength as absorbent, and then use of fluoride ion electrode as directed electrode, and saturated calomel electrode as the reference electrode. To determine with improved Gran's Drawing with a satisfactory result.

用氧瓶燃烧法预处理人发样品，以总离子强度剂兼作吸收剂，然后直接用氟离子选择电极作指示电极，饱和甘汞电极作参比电极，用改进Gran's作图法进行测定，结果满意。

The incidence and severity of enamel decalcification in orthodontic treatment either in three groups or in the number of the patient's teeth of three groups were evaluated before and after treatment.

目的：了解用固定矫器治疗后的牙釉质脱矿的发生率及严重程度，并评价用75%NaF处理牙面和使用含氟牙膏后的结果。

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。

It was shown that coagulating that fluoric wastewater with PFS brought about a good result,and that the optimized condition s coagulating that sewage .

结果表明：该含氟废水用PFS处理可以收到良好的除氟效果；室温下混凝处理的最适宜条件是：pH=7。

Results When select 1mol/L DTA in TISAB,the relative error of determination is smaller than 5.2%.Although the basis value is a little high,the filter is good absorbent of gaseity and aerosol fluoride.As for the pro-procedure,instead of dealing with supersonic for 15min in 40℃ stir in HCl for 1 hr.The average recovery of standard material is 93.9%.

结果 选用1mol/L柠檬酸钠作TISBA测定偏差＜5.2%；经浸渍处理的滤纸本底氟略有升高，但对气态或气溶胶态都能更好地阻留吸收；前处理方法可用酸浸搅拌成纸浆浸放1h代替40℃超声15min；用煤飞灰标准物质加标回收，平均回收率93.9％。

Its specific procedures are :first to treat the sample with hydrofluoric acid to convert the silica into a gas of silicon tetrafluoride to escape, and then at a PH value of 4 to 5 to treat the residual liquid with hydroxylamine hydrochloride to get the ferric ions reduced to ferrous ions.

其具体步骤为：首先用氢氟酸处理试样，使沉淀法白炭黑转化成四氟化硅气体逸出。

Besides the technologies of fluorine fixation and decreation, changes in the living habits of the residents, for example, the chili washed by water, the corn husked before it was processed into corn powder, will remove a certain content of fluorine absorbed on the corn husk and will play a important role in endemic fluorosis prevention.

除了采用固氟技术以外，病区居民改变生活习惯，在食用辣椒前用清水淘洗，把玉米粒加工成玉米面前进行脱皮处理，可以除去食物表面相当一部分氟，对预防地方病氟中毒有重要作用。

The method of using fluorine hydride to produce fluorobenzene is the best method,which overcomes the shortcoming of the Schiemann method,it can make the cost lower,reduce waste gas and raise recovery rate.

用无水氟化氢法生产氟苯是国内外最先进的方法，它克服了传统席曼法的缺点，它的显著优点是使成本降低、废气减少、收率提高，本文介绍了生产氟苯的两种主要方法的合成原理，重点介绍了无水氟化氢法生产氟苯的生产工艺过程及对所产生的废酸、污水、废渣的处理。

It achieves a certain extent effect of waterproof and oilproof. 3. Test the change of surface ingredient before and after the fluoridized of the FRP usingthe reflecting method of infrared spectrum. Then dip the fluoridized FRP in the cold water, warm water and petroleum ether for about half an hour, and surface ingredient havent changed too much.

用红外光谱反射法测试了经含氟物处理前后的玻璃钢表面结构变化，并且分别测试了在冷水、温水、石油醚中浸泡洗涤半个小时后的表面含氟处理的玻璃钢的表面结构，发现其表面结构与浸泡前无大的变化。

Pool water treatment engineering and equipment, various kinds of water treatment equipment and materials, power stations, electronic industry, profiles, surface treatment, process with pure water, pure water coating process, pharmaceutical sterile water infusion, water treatment system, processed food and beverages, load line between water and real estate small schools, hotels, boiler water softening water, groundwater iron and manganese removal, fluoride, air conditioning water treatment equipment.

泳池循环水处理工程及设备，各种水处理设备及材料，电站、电子工业、型材工艺、表面处理、涂装工艺用纯水、超纯水处理，医药用无菌水、大输液系统水处理，食品饮料加工用水、离子水生产线，房地产小区分质供水学校、宾馆用水，锅炉用水软化，地下水除铁、除锰、除氟，空调循环水处理设备。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。