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痕量
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  trace
    A Study on the Th-TTA Complexing-Adsorption Voltammetry for Determination of Trace Th(Ⅳ)
    Th-TTA络合吸附伏安法测定痕量钍的研究
短句来源
    Determination of Trace Selenium in Crude Drugs by Spectrophotometry with a Long-light-path
    长光路光度法测定中药材中痕量
短句来源
    Study on Catalytic Fluorescence Method for Deter-mination of Trace Manganese
    催化荧光法测定痕量锰的研究
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    An Investigation of the Chemiluminescence Reac-tion Between Luminol and Reductants(Ⅳ):The Chemiluminescence Determination of Trace Uranium
    还原剂与鲁米诺化学发光反应的研究(Ⅳ)──痕量铀的流动注射-化学发光测定
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    Study on Kinetic Spectrophotometric Determina-tion of Trace Amounts of Bromide(Ⅱ)
    动力学光度法测定痕量Br~-的研究(Ⅱ)
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    β-Corrction Spectrophotometric Determination of Calcium with Acid Chrome Blue K
    β修正酸性铬蓝K光度法测定痕量
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    Catalytic Photometric Determination of Tracevanadium(Ⅴ)with Vanadium-Potassium Chlorate-Dimethyl Yellow System
    氯酸钾-二甲基黄-钒(Ⅴ)体系催化光度法测定痕量
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    Spectrophotometric Determination of TraceAmounts of Copper after Preconcentration as ItsBathocuproine Complex on Chitin Column
    甲壳素色谱柱富集-柱前显色分光光度法快速测定痕量
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    Separation and Preconcentration of Cr (Ⅵ) /Cr (Ⅲ)on Algae and Determination by Graphite Furnace Atomic Absorption Spectrometry
    固氮蓝藻分离富集石墨炉原子吸收光谱法测定痕量Cr(Ⅵ)/Cr(Ⅲ)
短句来源
    On-Line FIA Preconcention of Zinc in Acid Rain and Determination by HCL-ICP-AFS
    酸雨中痕量锌的流动注射在线富集及HCL-ICP-AFS测定
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  trace
Using related sequences of Lucas numbers, other 3-manifolds are constructed, their geometric structures determined, and a curious relationship between the homology and the invariant trace-field examined.
      
Trace Inequalities, Maximal Inequalities, and Weighted Fourier Transform Estimates
      
We show that the trace of an indefinitely oscillating function on a subspace of ?d is not always indefinitely oscillating.
      
In the periodic case, the number of oscillations of the trace depends on the regularity of the function.
      
As applications, we obtain characterizations of the Besov and Triebel-Lizorkin spaces on Lipschitz curves, and the trace theorem on Γ of the Besov spaces onR2.
      
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Extra-pure zinc sulfate is the principal matirial in the preparation of phosphor for color-television.However,its quality greatly degrades when trace impurities are present.Ion exchange is an excellent method for its puri- fication and has been investigated ever since 1951.But this method has not been extensively used on a large scale,because the ion exchanger used is diffi- cult to be regenerated.In present investigation we solved the problem of re- generation of the ion exchanger by the application of coordination...

Extra-pure zinc sulfate is the principal matirial in the preparation of phosphor for color-television.However,its quality greatly degrades when trace impurities are present.Ion exchange is an excellent method for its puri- fication and has been investigated ever since 1951.But this method has not been extensively used on a large scale,because the ion exchanger used is diffi- cult to be regenerated.In present investigation we solved the problem of re- generation of the ion exchanger by the application of coordination chemistry. We found'that the blue phosphor prepared by our method is superior to that prepared by the prevalent pracipitation method in all of its qualities.

超纯硫酸锌是制备彩色电视荧光粉的主要原料,硫酸锌含有痕量杂质就使质量大大下降。离子交换法是提纯硫酸锌极好方法,自1951年即已开始研究。但因离子交换剂难于再生,故此法尚未推广。本文用络合物化学理论解决了离子交换剂的再生问题,甩本法制得的蓝色荧光粉与目前通用的沉淀法相比,各项质量指标均较优越。

A graphite furnace atomic absorption spectroscopy examination has been used to measure trace amount of Sb, Pb, Cd released from enamel appliance and the optimum measuring conditions, such as ash temperature, atomization temperature and time have been obtained in this work. The results show that this method has many advantages-promptitude, convenierce, high sensitivity and slight interference. The sensitivities of Sb, Pb, Cd in this method are 3.3×10-11, 1.0×10-11, 1.2×10-12g/1 % absorption respectively. Their...

A graphite furnace atomic absorption spectroscopy examination has been used to measure trace amount of Sb, Pb, Cd released from enamel appliance and the optimum measuring conditions, such as ash temperature, atomization temperature and time have been obtained in this work. The results show that this method has many advantages-promptitude, convenierce, high sensitivity and slight interference. The sensitivities of Sb, Pb, Cd in this method are 3.3×10-11, 1.0×10-11, 1.2×10-12g/1 % absorption respectively. Their rates of recovery are 96~106%, 98~110%, 98~108% respectively. The relative standard deviations for the solution containing 10ppb Sb2O3, 8ppb PbO, and 2ppb CdO are 10.6%. 4.6% and 3.1% respectively.

本文介绍了用石墨炉原子吸收光谱法直接测定搪瓷餐具浸出液中痕量元素锑、铅、镉,并对这三种元素的灰化温度、原子化温度和原子化时间进行了选择试验。结果表明,本方法其有快速、简便、灵敏度高、干扰少等优点。采用本方法测定锑、铅、镉的灵敏度分别为3.3×10~(-11)、1.0×10~(-11)、1.2×10~(-12)克/1%吸收;回收率分别为96~106%、98~110%、98~108%;对于10ppb锑、8ppb铅、2ppb镉的溶液,其相对标准偏差分别为10.6%、4.6%和3.1%。

A study on the complexing-adsorption voltammetry for direct determinationof trace Th(Ⅳ) in water is described. In the medium of HAc-NaAc, Th~(4+) canbe combined with HTTA to form a comparatively steady ternary chelate whichwill be adsorbed and preconcentrated on the mercury electrode and determined bycathodic stripping voltammetry. At a controlled potential of -0.1 V (vs.SCE), thechelate is adsorbed and preconcentrated for 3 min., then by cathodic scanningtill -1.0v(vs. SCE), a highly sensitive peak of reduction...

A study on the complexing-adsorption voltammetry for direct determinationof trace Th(Ⅳ) in water is described. In the medium of HAc-NaAc, Th~(4+) canbe combined with HTTA to form a comparatively steady ternary chelate whichwill be adsorbed and preconcentrated on the mercury electrode and determined bycathodic stripping voltammetry. At a controlled potential of -0.1 V (vs.SCE), thechelate is adsorbed and preconcentrated for 3 min., then by cathodic scanningtill -1.0v(vs. SCE), a highly sensitive peak of reduction current will be shownat about -0.60V(vs. SCE). The height of peak is linearly related to the concen-tration of Th~(4+) in the range of 2.0×10~(-9)mol/l to 1. 0×10~(-7)mol/l, the detectionlimit will be 1. 0×10~(-9)mol/l, the relative standard deviation for seven paralleldetermination is shown to be 2.51%. The mechanism of adsorption stripping andthe conditions for determination have been discussed. The method has been usedto determine the trace Th~(4+) in the industrial waste water with satisfaction.

本文对吸附伏安法直接测定水体中痕量钍作了研究。在HAc-NaAc介质中钍离子(Th~(4+))和噻吩甲酰三氟丙酮(HTTA)形成较稳定的三元络合物,先吸附富集在悬汞电极上,后采用阴极溶出伏安法检测痕量钍。控制电位为-0.1伏(VS.SCE)吸附富集3分钟,然后阴极扫描至-1.0伏(VS.SCE),在-0.60伏(VS.SCE)电位处获得一个高灵敏度的还原电流峰。钍离子浓度在2.0×10~(-9)mol·1~(-1)~1.0×10~(-7)mol·1~(-1)范围内,溶出峰高和钍离子浓度呈良好的线性关系,最低检测限达1.0×10~(-9)mol·1~(-1),在含5.0×10~(-8)mol·l~(-1)钍离子的体系中,连续测定七次相对标准偏差为2.51%。同时我们还对该体系的吸附溶出机理和测定条件作了探讨,并利用该法对工业排放废水中的痕量钍进行了测定,其结果良好。

 
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