氟

Methods Using acetamide as the internal standard,extraction column and extraction conditions of fluoroacetamide from blood and urine samples were optimized by comparing the extraction efficiency of different solid-phase extraction columns and the effects of experimental conditions on recovery.

选择乙酰胺为内标，通过比较不同固相柱的萃取效率和不同条件对回收率的影响，优化用于血和尿样中氟乙酰胺萃取的固相柱和提取条件，利用氟乙酰胺与乙酰胺质谱图的分子离子峰面积之比与氟乙酰胺浓度的定量关系，建立血和尿样中氟乙酰胺鼠药的GC/MS定量分析新方法。

Three alicyclic dianhydrides, 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,4,5-cyclopentanetetracarboxylic dianhydride, and 1,2, 4, 5-cydohexane tetracarboxylic dianhydride were polymerized with two aromatic diamines, 1,4-bis (4-amino-2-trifluoromethylphenoxy) benzene (6FAPB, a) and 4, 4'-bis(4-amino-2-trifluoromethyl phenoxy) biphenyl (6FBAB, b) respectively, via a two-step polycondensation procedure to afford two series of fluorinated semi-alicyclic polyimides.

分别将脂环族二酐单体1，2，3，4-环丁烷四酸二酐、1，2，4，5-环戊烷四酸二酐和1，2，4，5-环己烷四酸二酐与芳香族含氟二胺1，4-双（4-胺基-2-三氟甲基苯氧基）苯(6FAPB， a)和4，4'-双（4-胺基-2-三氟甲基苯氧基）联苯(6FBAB， b)反应制备两个系列的含氟半脂环族聚酰亚胺，研究了PI薄膜的热性能和光学性能。

Preparation of water purifying agent from analcite rocks and study on its fluorine removal ;2. The influences of activation method of active magnesium oxide, activating conditions, generation conditions, fuorine absorbing capcity and various technological factors on fluorine removal were studied.

对活性氧化镁的活化方法、活化条件、再生条件、吸氟容量及各种相关工艺因素的研究，表明活性氧化镁的吸氟容量大、净化后的水中含有约7mg／LMg2＋，有益于人体健康，是含氟饮矿泉水的理想除氟工艺。

It is prepared from pentachluorobenzonitrile by using KF as fluoride to substitute chlorine in the presence of benzonitrile under high temperature. But owing to the low solubility of KF and rigor synthesis condition, and the parallel auxiliary reactions, the speed of reaction as well as the yield is very low.

五氟苯甲腈的合成开发以五氯苯甲腈为原料在较高的温度下用氟化钾做氟化剂，通过取代苯环上氯原子而得到的，由于氟化钾在溶剂中溶解度低，合成条件要求苛刻，反应速度较慢，同时存在有平行竞争副反应，因而反应收率较低，国内尚无厂家生产。

One was HF/pyridine diazotization reaction at the 4-position of fluorene ring, and the other was Grignard reaction on the 9-position with Grignard reagent of pentafluorochlorobenzene.

使用HF/吡啶法在芴环的4位引入了氟原子，使用五氟氯苯格氏试剂在芴环的9位引入了全氟苯，合成了五个氟取代三联(9，9-二苯基)芴化合物。

The concentration of fluorine in the LPD-SiO/sub 2/ change with the concentration of hydro-fluorosilicic, and by the FTIR spectroscopy we find the concentration of about 1.5M will get the maximum concentration of fluoric incorporation.

在LPD含氟二氧化矽的实验中，调变六氟矽酸的浓度将可得到不同含氟量的二氧化矽膜，藉由FTIR的频谱可知，1.5M的浓度可得最高之含氟量。

The social and economic benefit of drinking water fluoridation has been widely accepted as a public sanitation measure in some western countries.

人体氟的过量摄入会导致氟斑牙和氟骨症，适量的摄入氟可避免人群龋病等口腔疾病的流行。

The Chongqing burning coal fluorosis sickness fluorine spot tooth condition gradually reduces, the condition degree gradually drops, the ward type gradually reduces, showed adopts through 20 years changes the stove to change the stove primarily comprehensive nature preventing and controlling measure effect to be better; The new ward village appears the phenomenon which aggravates with the partial wards village condition to be worth paying attention.

重庆市燃煤型氟中毒病氟斑牙病情逐渐减轻，病情程度逐渐下降，病区类型逐渐减轻，说明通过20年的采取以改炉改灶为主综合性防治措施效果较好；新的病区村出现和部分病区村病情加重的现象值得关注。燃煤型氟中毒；氟斑牙；氟骨症

On the other hand, 3(2)-fluoro-4-methoxyl methyl benzyl alcohol and 3(2)-fluoro-4-methyl benzyl alcohol are mixture and components of pyrethrum esters. Both of them have "mixture fluorine effect " and higher activity, lower drug resistance. As we know, the mixture benzyl alcohol containing fluorine is more easy to be synthesized than the single, so the cost of preparation is lower. We hope to apply it to molecule design of the new agriculture chemical. On the base of molecule design and structure-activity relationship research of pyrethric acid II and mixture of alcohol containing fluorine, we intend to get new pyrethrum ester that have higher activity and lower resistance.

另一方面，混合含氟对甲氧甲基苄醇和混合含氟对甲苄醇都是具有&混合氟效应&的高活性、低抗性的拟除虫菊酯醇组分，由于混合含氟醇的合成要比单一异构体的合成容易，成本较低，本文希望将其应用到新农药的分子设计中，用第二菊酸和一些含氟醇进行分子设计及进一步的构效关系的研究，筛选出一些高活性低抗性的拟除虫菊酯换代新品种。

In the paper, the polymerization of fluoroalkyl acrylate and fluoroolefins in supercritical carbon dioxide are reviewed in detail,including homopolymerization and copolymerization of fluoroalkyl acrylate, synthesis of melt-processable tetrafluoroethylene polymers, ion-exchange resins and polyvinylidene fluoride et.al.

本文详细地介绍了近年来以超临界二氧化碳为介质的氟烷基丙烯酸酯类单体和氟烯烃类单体的聚合反应研究，其中涉及氟烷基丙烯酸酯类单体的均聚和共聚，可熔融加工的四氟乙烯聚合物，离子交换树脂，偏氟乙烯的均聚和共聚合等。

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。