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  calix [
     Extraction properties of new calix[4]arene derivatives to Pb~(2+),Cd~(2+)
     新型杯[4]芳烃衍生物对Pb~(2+),Cd~(2+)的萃取性质
短句来源
     Liquid-liquid extraction properties of new calixarene derivatives D to Pb~(2+) & Cd~(2+) were studied,and the comparison of the properties with the self-made calix[4]arene A and its derivatives B,C were made.
     研究了新型杯[4]芳烃D对Pb2+,Cd2+离子的液-液萃取性质,并将其与自制的杯[4]芳烃A及其衍生物B、C对Pb2+,Cd2+离子的液-液萃取性质进行了比较。
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     Polymerization of Ethylene with Calix[8]arene Neodymium-Al(i-Bu)_3 System
     杯[8]芳烃钕-Al(i-Bu)_3体系催化乙烯聚合
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     1H NMR show that all new calix[4]arenes are cone conformation.
     ~1H NMR表明所有新的杯[4]芳烃都具有锥形(cone)构象。
短句来源
     The calix[8]arene was synthesized and the extraction of rare earth metal ions Nd~(3+),Eu~(3+),Pr~(3+) in solution with calix[8]arene was studied.
     合成了对叔丁基杯[8]芳烃,研究了其对稀土金属钕、铕、镨离子(Nd3+、Eu3+、Pr3+)在溶液中的萃取。
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     Synthesis,Crystal Structure and Characterization ofa Novel Super Molecule [Na(C_(60)H_(80)O_(12))]~+[Au(SCN)_4]~-
     金(Ⅲ)与杯[4]乙酯合钠髣超分子化合物:[Na(C_(60)H_(80)O_(12))]~+[Au(SCN)_4]~-的合成、结构及性能
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     Improvement on synthesis of 25,26,27,28-4 tetrahydroxylcalix[4] arene
     25,26,27,28-4羟基杯[4]芳烃合成工艺改进研究
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     Studies on the Inclusion Property of 5,11,17,23-Tetra-tert-butyl-25,26, 27,28-tetrakis[3-(methoxycarbonyl)benzyloxy]calixarene
     5,11,17,23-四叔丁基-25,26,27,28-四[3-(甲氧基羰基)苄氧基]杯[4]芳烃包合性能的研究
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     Optimization of Synthesis Condition of 25,26,27-trimethoxy-28-hydrocalix[4]arene
     25-羟基-26,27,28-三甲氧基杯[4]芳烃合成条件的优化
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     The Synthesis of 11,23-Dihexanoyl-26,28-Dimethoxycalix[4]Arene
     11,23-二己酰基-26,28-二甲氧基杯[4]芳烃的合成
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  相似匹配句对
     Half Empty?
     半空?
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     AN IGNITOR OF SINTER POT
     烧结点火器
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     Drink Drank Drunk
     [不醉]
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     The Synthesis of Calix[4]arenes Bearing Nitrogen
     含氮[4]芳烃的合成
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  calix [
Syntheses and metal ions recognition of dendritic calix[n]arenes (n = 6,8) amide derivative
      
Liquid crystalline behavior and fluorescent property of calix[4]arene containing azobenzene photochromic group
      
It was found that the calix[4]arene skeleton was a good platform for conformation immobilization of azobenzene photochromic group and the formation of liquid crystalline.
      
Solubility, Acid-Base and Complexation Properties of Calix[4]resorcinarene in Aqueous Solutions of Nonionic Surfactants
      
Solubility and acid-base properties of calix[4]resorcinarene (H8L) in aqueous solutions of nonionic surfactants Triton X-100, Triton X-405, and Brij-35, as well as isopropanol were studied by pH-potentiometry.
      
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Various procedures for spectrographic analysis of metallurgical slags have been found inthe literature,but,in practice,results are often influenced by the chemical nature of the samples.This paper reports some results obtained on the spectrographic analysis of open-hearth slags bythe copper cup-electrode solution method.An activated a.c.arc (ПС-39) is used as light source.To the nitric acid solution ofslag samples is added stannous chloride (Sn as internal standard) and potassium bromide (Kfor the stablization...

Various procedures for spectrographic analysis of metallurgical slags have been found inthe literature,but,in practice,results are often influenced by the chemical nature of the samples.This paper reports some results obtained on the spectrographic analysis of open-hearth slags bythe copper cup-electrode solution method.An activated a.c.arc (ПС-39) is used as light source.To the nitric acid solution ofslag samples is added stannous chloride (Sn as internal standard) and potassium bromide (Kfor the stablization of the arcing).The prepared solution is then treated in a hot water-bath.The size and shape of the cup-electrode is so chosen that the height of the solution surface doesnot vary much during exposure.Because of the non-uniform distribution of the elements tobe analysed in the arc column,the slit is illuminated directly from the arc without using lenses.With fixed working curves we have obtained the lime-to-silica ratio of 20 slag samples.The differences between spectrographic and chemical values are less than ±5%.The completeanalysis of a few slag samples has been also carried out and the accuracy is found to be aboutthe same as those published in the literature.Causes for shifts of working curves in the course of experiments and means of prevention,and the problem of the dissolution of slags in nitric acid are discussed.Experiments indicatethat the turbulent effect of solution samples in the cup-electrode during arcing is advantageousand necessary.

本文叙述用形铜电极溶液法进行平炉渣光谱分析的一些结果。实验用ПС-39型交流电弧作光源,硝酸溶解渣样,加 SnCl_2(Sn 作内标)和 KBr(K 作燃烧稳定剂),并且把这溶液经过加热处理。再适当地选定了铜的大小和形状,和采用了直接照明系统。用固定定标曲线法作了20个渣样的硷度(Ca/Si)分析。与化学分析结果比较相差小于±5%。最后讨论了铜溶液法进行分析时定标曲线发生移动的原因和防止的方法,试样在硝酸溶液中溶解的问题,与试样溶液在燃烧过程中的翻腾现象。致谢:参加本项工作一部分的尚有周熙宁、徐升美、王桢枢等同志,谨此致谢。

Following the development of the copper cup-electrode solution method for the spectrogra-phic analysis of open-hearth slags,a series of experiments was carried out to study the volatili-zation process in such a spectral light source.The correlation of the different volatilizationcurves obtained with different experimental conditions revealed that the volatilization processmay be considered as of two stages.The first stage corresponds to the appearence of the firstpeak on the volatilization curve,where no fractional...

Following the development of the copper cup-electrode solution method for the spectrogra-phic analysis of open-hearth slags,a series of experiments was carried out to study the volatili-zation process in such a spectral light source.The correlation of the different volatilizationcurves obtained with different experimental conditions revealed that the volatilization processmay be considered as of two stages.The first stage corresponds to the appearence of the firstpeak on the volatilization curve,where no fractional distillation was observed.It means thatduring this stage,volatilization of the substances into the radiating vapor comes directly fromthe surface of the solution.The second stage corresponds to the appearance of a second peakand the shape and position of this peak is very sensitive to the slight variation of experimentalconditions,which also vary differently for various elements.This tendency toward fractionaldistillation may be directly correlated with the different electrode potentials of the elements.Thus,we regard that the volatilization of the elements,during this stage,into the arc columnis essentially from the inner electrode of the cup.Because of these characteristics of thevolatilization process cited above,substances that do not dissolve in the sample solution can alsoenter into the radiating vapor especially during the first stage from the turbulent solution.Aset of experimental data indicates that the precision of spectral analysis and the position of thecalibration curves are not obviously affected by the fact that open-hearth slags do not alwayscompletely dissolve in an acid solution.The effect of the solvent(HNO_3 and HCl)on the slope of the calibration curves and theinfluence of the anions on the density of the spectral lines of the different analyzing elementswere also briefly studied.Taking into account of the results obtained from the study of the volatilization process of sucha spectral source,we were able to eliminate shifts of the calibration curves in routine analysisof open-hearth slags.This was accomplished by strict control of the height of the surfaceof the solution inside the cup-electrode and careful workmanship of the lower inner electrode.The relative arithmetic mean error of nine independent analyses for all the elements analyzed inslags was within 4%.Preliminary experiments show that this method is also applicable tospectrographic analysis of blast-furnace slags and magnesia.

根据形铜电极溶液法用于平炉渣光谱分析所得的初步结果,进行了一系列有关形电极溶液电弧光源中燃烧过程的系统试验。在不同情形下测定了溶液中各元素的燃烧曲线,看到曲线上先后有两个高峯出现,因而认为光源中的燃烧过程有两阶段,物质在这两燃烧阶段中进入放电区的方式不同。第一阶段相当于第一高峯出现的期间,在这时并没有分馏现象,这表示溶液中的物质主要是经过溶液的翻腾作用而直接从液面进入放电区的。燃烧过程的后一阶段相当于曲线上的第二高峯的部分,这个峯的形状和位置对于不同元素和不同实验条件很灵敏,有分馏现象出现。根据对于各种分析元素的分解电压,可以认为,溶液中的物质在这个燃烧阶段主要是通过电极心而进入弧柱的。在平炉渣的实际分析中,严格地控制中液面的高低和铜电极心的加工规格,所得到各元素的九次独立分析误差都在4%以内。

A definite type of hydrometer with linear and fine stem and parabolic bulb is suggested.Before measurement,the hydrometer should be well calibrated. The contents of soil particles of different size can be directly determined at different time after sedimentation of particles. Grinding the soil sample for five minutes is available for mechanical dis- persion of soil particles.60 ml of 0.5 N NAPO_3 for 50 grams of soils is suggested for calcareous soils and 60ml of 0.5 N NaOH for 50 grams of soils is suggested...

A definite type of hydrometer with linear and fine stem and parabolic bulb is suggested.Before measurement,the hydrometer should be well calibrated. The contents of soil particles of different size can be directly determined at different time after sedimentation of particles. Grinding the soil sample for five minutes is available for mechanical dis- persion of soil particles.60 ml of 0.5 N NAPO_3 for 50 grams of soils is suggested for calcareous soils and 60ml of 0.5 N NaOH for 50 grams of soils is suggested for lateritic soils.

本文对于土壤机械分析在比重计的校正、比重计速测和土粒分散措施进行了一些试验,现将结果摘要如下:1.土壤机械分析中所用的比重计式样和规格应当划一,校正应求精确,这对具体工作方便很多。最好的比重计式样是流线型的浮泡,内盛水银,柄桿应细长,刻度应精确校正。最好固定模型制造比重计以便式样划一。2.固定一个比重计按实际工作结果,假定一个土粒沉降深度,根据司马克公式计算出不同温度下各级土粒沉降一定深度所需时间,以后可按不同温度在不同时间直接测出某种粒径的土粒合量,方便很多。 3.在未除去电解质的情况下,煮沸处理对于土粒分散并无特殊效果,研磨5分钟或搅拌15分钟与振荡8小是对土粒分散的效果很接近,为简化物理分散,研磨处理是可采用的。据初步试验结果,土壤分散剂的用量是在石灰性土壤中以每50克土壤用60毫升0.5N NaPO_3较为适宜,红壤中以50克土用60毫升0.5N NaOH 为较适宜。盐土中的溶性盐分可用玻倾倒法结合平板漏斗或巴氏滤管以洗去之,但盐土中的有些盐分可帮助分散剂4分散土粒,据实验结果各种盐类增加 NaPO_3的分散力并不一致,其次序是 Na_2SO_4>NaCl+Na_2SO_4(1:1)>N...

本文对于土壤机械分析在比重计的校正、比重计速测和土粒分散措施进行了一些试验,现将结果摘要如下:1.土壤机械分析中所用的比重计式样和规格应当划一,校正应求精确,这对具体工作方便很多。最好的比重计式样是流线型的浮泡,内盛水银,柄桿应细长,刻度应精确校正。最好固定模型制造比重计以便式样划一。2.固定一个比重计按实际工作结果,假定一个土粒沉降深度,根据司马克公式计算出不同温度下各级土粒沉降一定深度所需时间,以后可按不同温度在不同时间直接测出某种粒径的土粒合量,方便很多。 3.在未除去电解质的情况下,煮沸处理对于土粒分散并无特殊效果,研磨5分钟或搅拌15分钟与振荡8小是对土粒分散的效果很接近,为简化物理分散,研磨处理是可采用的。据初步试验结果,土壤分散剂的用量是在石灰性土壤中以每50克土壤用60毫升0.5N NaPO_3较为适宜,红壤中以50克土用60毫升0.5N NaOH 为较适宜。盐土中的溶性盐分可用玻倾倒法结合平板漏斗或巴氏滤管以洗去之,但盐土中的有些盐分可帮助分散剂4分散土粒,据实验结果各种盐类增加 NaPO_3的分散力并不一致,其次序是 Na_2SO_4>NaCl+Na_2SO_4(1:1)>NaCl,但土壤中盐分组成复杂是否可不进行洗盐而直接加分散剂以后应实际试验。

 
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