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method of determination     
相关语句
  测定方法
     GB/T5138 - 1996 the method of determination of residue in liquid chlorine improve
     GB/T518-1996液氯残渣测定方法的改进
短句来源
     A rapid HPLC method of determination of cefclor in human plasma and urine was established. The analyticalcolumn was Hypersil C18 (4. 6 × 200mm , 5m) , the mobile phase was methol : THF : H2O( cotaining 0. 5g SHS , 7. 5ml TEA, 6mlphosphate in 1L, pH2. 5) = 23 : 4 : 73. The flow rate was 1. 0 ml/min;
     建立头孢克罗在人血浆及尿中的HPLC快速测定方法,选用分析柱为Hypersil C18(4.6x200mm,5m),流动相采用甲醇:四氢呋喃:水(1L水中含庚烷磺酸钠0.5g、三乙胺7.5ml。磷酸6ml,pH2.5)为23∶4∶73,流速1.0ml/min;
短句来源
     The method of determination Mo, Cr, W, P, Pb, Nb, Zr,Sc, Yb and Y in geologic samples using computer controlled scanning monochromator is described.
     本文介绍了由计算机控制的扫描单色仪在地质样品中Mo、Cr、W、P、Pb、Nb、Zr、Sc、Yb、Y等10个元素的测定方法
短句来源
     A new release O 2 from granulocytes model and a new method of determination was found.
     建立起一个新的粒细胞O-·2释放模型和测定方法
短句来源
     Accordling to the basic principle of GB10574-89,the method of determination of tin in tin-lead solders was studied further.
     本文根据GB10 5 74- 89《碘酸钾滴定法测定锡量》的基本原理 ,对锡铅焊料中锡的测定方法做了进一步探讨。
短句来源
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  检测方法
     The detection limit of the method of determination after fluoroacylation is 3ng/g, RSD≤9.0%. The recoveries of DON and NIV added to feed at the range of 20~700ng/g are 85.5~91.7% and 74.8~83.1% respectively.
     加标量在20~700ng/g的范围内,氟化衍生气相色谱-质谱检测方法中DON和NIV的回收率分别为85.5~91.7%、74.8~83.1%,检出限为3ng/g,RSD≤9.0%。
短句来源
     The detection limit of the method of determination after trimethylsilylation for DON and NIV are 6ng/g and 8ng/g respectively.
     硅烷化衍生气相色谱-质谱检测方法中DON和NIV的回收率分别为81.7~92.6%、73.8~86.6%,检出限为6ng/g、8ng/g,RSD≤4.9%。
短句来源
     Conclusion:The method of determination is simple,accurate and stabilization.
     结论:本方法是一种简单,准确而又稳定的检测方法
短句来源
     Cs-137 is used as the object of the study. By means of the method of instumental constant and the method of detection efficiency, the radioactivity of the samples were monitored,the result of the determination was analysed,and the method of determination was also filtrated.
     实验选用青岛地区常见的出口水产品作为样品,以Cs-137作为研究对象,运用仪器常数法、探测效率法等方法测定样品中放射性活度,对检测结果进行了误差分析,对检测方法进行了筛选。
短句来源
     RESULTS Chloramphenicol palmitate in phosphatidylcholine O/W microemulsions were prepared and the method of determination was developed.
     结果取得了较好的棕榈氯霉素卵磷脂O/W型微乳制剂及较好的含量检测方法
短句来源
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  法测定
     The method of determination of x's value in polycrystal Hg_(1-x)Cd_xSe by means of infrared spectrometry has been established.
     本文建立了用红外光谱法测定Hg_(1-x)Cd_xSe组分x值的方法。
短句来源
     The Study on IC Chromatograph Potential Method of Determination of S~(2-)
     IC色谱仪电位法测定S~(2-)的运用与研究
短句来源
     The characteristic concentration (1% absorption), detection limit, lnear range,coefficient of variation and recovery of the method of determination o f lead are 0. 0046, 0. 0044, 0-5.0 μg/ml, 0 .78 and 98. 5-102%, respectively.
     该法测定铅的特征浓度(1%吸收)、检测限、线性范围变异系数和回收率分别为0.0046、0.0044、0—5.0μg/ml、0.78和98.5—102%。
短句来源
     The paper introduces the method of determination of fluoride content in the VC-Ca. The sample recovery ratio is between 98.82%-100.8%.
     研究了氟离子选择电极法测定VC-Ca中氟含量,加标回收率在98.82%-100.8%之间。
短句来源
     A new method of determination of Nb, Ta, Zr, Hf, Ti, Re etc trace elements in rock and soil by combination of chemical precocentration and XRFA has been described.
     研究了化学富集XRFA法测定岩石、土壤中Nb,Ta,Zr,Hf,Ti,RE等微量元素的方法。
短句来源
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  测定方法的
     GB/T5138 - 1996 the method of determination of residue in liquid chlorine improve
     GB/T518-1996液氯残渣测定方法的改进
短句来源
     Advances on the Method of Determination Trimethylamine
     三甲胺测定方法的研究进展
短句来源
     Study on the Method of Determination of NH_4~+-N
     氨态氮测定方法的研究
短句来源
     Study on Method of Determination of Residual HMX and RDX in Waste Water
     废水中微量残留炸药奥克托今、黑索今测定方法的研究
短句来源
     The improved method of determination of sorbic acid and benzoic acid in food
     食品中山梨酸、苯甲酸测定方法的改进
短句来源
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      method of determination
    A photometric method of determination of activities of alanine and aspartate aminotransferases based on the use of L-glutamate oxidase and peroxidase has been developed.
          
    Method of determination of the content of hemoglobin-like proteins in heterogenic mixtures
          
    A modification of the cepstral signal analysis, the method of determination of the fundamental tone through the linear high-frequency filtering of the logarithmic spectrum with subsequent nonlinear processing, was proposed.
          
    Proposed was a method of determination of the structure of a model of a dynamic system from the bounded mismatches.
          
    A numerical method of determination of the statistical characteristics of the model coefficients at mutual transformations of the mathematical models of dynamic systems of different types was proposed.
          
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    The effects of copper and zinc ionsupon the precipitation of barium sul-phate have been noted for a long time.However,the results published wereeither not systematic(3,4b,5,6)or obtained under conditions apart fromusual analytical practice(7,8).Thus,it seems necessary to investigate thissubject in more detail by the usual methods of determination.The presentcommunication reports(a)the effect of various amounts of cupric and zincions and(b)the influence of different acidities during precipitation in thepresence...

    The effects of copper and zinc ionsupon the precipitation of barium sul-phate have been noted for a long time.However,the results published wereeither not systematic(3,4b,5,6)or obtained under conditions apart fromusual analytical practice(7,8).Thus,it seems necessary to investigate thissubject in more detail by the usual methods of determination.The presentcommunication reports(a)the effect of various amounts of cupric and zincions and(b)the influence of different acidities during precipitation in thepresence and absence of zinc ions.It is found that the interference of copper in the determination of sulphuras barium sulphate up to a ratio of 20:1 for Cu:S is negligible.The deviationsof the results obtained from theoretical values are all within ±2‰(see Table1),and do not show any regularity with the amount of copper added.The presence of zinc ions alone gives satisfactory results(slightly lowerthan theoretical values).As the amount of zinc ions in solution increases,thedeviations become somewhat wider(Table 2).The low results are presumedto be due to(1)the formation of soluble zinc-sulphate complex,which holdsa part of sulphate in solution,and/or(2)diverse ion effect.In the presenceof zinc ions,introducing hydrochloric acid up to 0.1 N before precipitationcauses essentially the same errors as if hydrochloric acid were absent(cf.Tables2 and 3),while at and beyond 0.2 N positive errors are obtained.A spectrographic examination of the precipitates reveals that zinc doescoprecipitate with barium sulphate,though only to a slight extent.The amountof zinc coprecipitated decreases with the increase of the acidity of the solutionfrom which the precipitate is thrown down.

    本文报告铜及锌离子对于硫酸钡定硫的影响,找出了铜的影响几近于零,锌的影响亦微。锌离子能与硫酸钡共同沉淀。

    As cinchonine is not produced in our country and the ignition of mercurous tungstate is a troublesome operation leads us to examine critically the determination of tungsten as barium tungstate.The results of our experiments reveal that barium tungstate should be precipitated from a boiling solution of pH 7.2—8.0 with a rather large excess of barium chloride. The concentration of the precipitant, after precipitation, should be maintained within eight tenth to two millimolar, in order to obtain acceptable results....

    As cinchonine is not produced in our country and the ignition of mercurous tungstate is a troublesome operation leads us to examine critically the determination of tungsten as barium tungstate.The results of our experiments reveal that barium tungstate should be precipitated from a boiling solution of pH 7.2—8.0 with a rather large excess of barium chloride. The concentration of the precipitant, after precipitation, should be maintained within eight tenth to two millimolar, in order to obtain acceptable results. The barium tungstate precipitates may be ignited at 500—900°. When they are dried at 105 or 150°, they weigh several tenth milligrams heavier than that after ignition, presumably due to very small amounts of occluded water. The carbonate (from carbon dioxide in air and in water used) and chloride (from the precipitant) contents of the precipitates are negligible, being less than three and three to four parts per thousand respectively, while no precautions are taken to remove or guard against carbon dioxide con tamination. This method of determination may be used to estimate as low as six milligrams of tungsten trioxide. The exclusion of carbon dioxide during the determination, as suggested by Buscarons Ubeda et al and Duval et al, is found to be unnecessary. The influence of several ammonium, potassium and sodium salts are studied. Among them, sodium and ammonium acetates interfere the least, and potassium chloride the most. For detail please refer to Fig. 3 in this paper.

    本文敍述用鎢酸鋇法测定鎢的適宜條件。沉澱應在pH7.2—8.0,微沸的溶液,用熱氯化钡溶液進行。沉澱劑應在沉澱後仍維持0.8—2毫克分子濃度。過低則沉澱不完全,過高則結果偏高。灼燒沉澱温度為500—900°。本法可以测定6毫克及以上的三氧化鎢。沉澱中的碳酸鹽(<3‰)和氯化物(當沉澱劑過量为50—100%時,3—4‰)均可不顧。隔絕或除去二氧化碳也無必要。幾種銨、鉀和鈉鹽的影響亦曾加以探討。

    The ethyl xanthate reaction for molybdenum is sensitive and is not interfered by tungsten, vanadium, chromium (Ⅲ) and uranium. Hence it is desirable to investigate it further as a method of determination. The results found are as follows:The acidity of the aqueous solution in which the molybdenum-xanthate complex forms should be adjusted to pH 1.11-1.56. And the complex is stable only for one minute in the media mentioned. The addition of acetone (2-25%) to the aqueous solution does not stabilize the complex...

    The ethyl xanthate reaction for molybdenum is sensitive and is not interfered by tungsten, vanadium, chromium (Ⅲ) and uranium. Hence it is desirable to investigate it further as a method of determination. The results found are as follows:The acidity of the aqueous solution in which the molybdenum-xanthate complex forms should be adjusted to pH 1.11-1.56. And the complex is stable only for one minute in the media mentioned. The addition of acetone (2-25%) to the aqueous solution does not stabilize the complex to a notable degree.For extraction of the molybdenum-xanthate complex, ten organic solvents, namely petroleum ether, benzene, toluene, chloroform, carbon tetrachloride, chlorobenzene, diethyl ether, isoamyl alcohol, amyl acetate and isobutyl methyl ketone, are tested with respect to (a) the stability of the complex in these solvents (using optical density of the extracts as a measure) and (b) the effectiveness of various solvents in extraction. The complex is most stable in petroleum ether and toluene (at least for three days). The color of the complex in benzene is stable for fourteen minutes; in chloroform, ten minutes; in chlorobenzene, seven minutes and in carbon tetrachloride, six minutes. On the other hand, diethyl ether, isoamyl alcohol, amyl acetate and isobutyl methyl ketone are unsuitable for extracting the complex. Under similar conditions, various amounts of moly bdenum are extracted with different organic solvents, and the results obtained are plotted in Fig. 3. From the curves, it is found that among the organic solvents studied the following ranges of molybdenum content obey Beer's law: in chlorobenzene, 0-0.4 mg Mo; in benzene and in toluene, 0-0.3 mg Mo; and in chloroform and in carbon tetrachloride, 0-0.2 mg Mo. Petroleum ether can only be used with very low concentrations of molybdenum, and this is in accordance with Malowan's result.

    本文證實溶液酸度对乙黃原酸钼錯合物的穩定度有影響。溶液的酸度最好調節在pH1.11—1.56之间。該钼錯合物生成后在水中僅穩定一分钟,故應在此期間以內用有機溶劑抽提。在丙酮-水溶液中,該钼錯合物亦不穩定。本文試驗了十種有機溶劑作抽提劑,比较了乙黄原酸钼錯合物在其中的穩定性和不同量钼的抽提效果。找出對該钼錯合物的穩定性而言,以石油醚和甲苯為最好。苯、三氯甲烷、四氯化碳和氯代苯次之(在一定的時間內可以使用),而乙醚、異戊醇、乙酸戊酯和異丁基乙酮,則均不適於作抽提之用。对抽提效果而言,氯代苯在钼含量0—0.4毫克範圍內遵循Beer定律;苯及甲苯次之;三氯甲烷或四氯化碳又次之;石油醚最差。根據上述,擬推荐甲苯作為最适宜之抽提劑。

     
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