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痕量
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  trace
    Determination of Trace Zinc in Hnman Body by Anodic Stripping Voltammetric Method with 8-Hydroxyquinoline Modified Electrodes
    8-羟基喹啉修饰电极阳极溶出伏安法测定人体中痕量
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    Determination of Trace Selenium in Human Body By Using the Method of High Pressure Wet Digestion and Differential Pulse Polarography
    高压湿法消化,微分脉冲阴极溶出伏安法测定人体痕量
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    Using 8-Hydro-quinoline Modified Electrode to Detect the Trace Copper in Human Body
    8-羟基喹啉化学修饰电极溶出伏安法测定人体中痕量
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    Fluorimetric Determination Studies of Trace Cycmide and its Application
    荧光分光光度法测定痕量氰化物的研究及其应用
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    Determination of Trace Selenium in Urine by Catalytic Polarography
    催化极谱测定尿中痕量硒的研究
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    Direct Determination of Tin in Water by Oscillopolarography
    示波极谱法直接测定水中痕量
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    Comparison between microfluorescence method and fluorescence method in determination of selenium in cereals samples
    微量荧光法测定粮食样品中痕量硒-与原荧光法的比较
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    Determination of Cu ̄(2+) and Zn ̄(2+) in Tap Water by HPLC with Post-column Derivatization
    液相色谱柱后衍生法测定自来水中痕量Cu~(2+)和Zn~(2+)
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    Rapid Determination of Lead in Beer by Differentital Potential Stripping in the Presence of Emulgent OP
    乳化剂OP微分电位溶出法快速测定啤酒中痕量铅的研究
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    A study on the bromic kalium′s oxidation of acridine yellow mensurating nitriteby using the method of new catalysed depigmentation luminosity spectrophotometry
    籍溴酸钾氧化吖啶黄新催化褪色光度法测定痕量亚硝酸根的研究
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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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The optimum conditions for the extraction of C(VI) in strong acid with N235-xylene-HCI system and for the counter-extraction of it with HCI-NaCl were studied.After enrichment,the ultratrace amount of U(VI) at 0.5 ppb level can be determined through U(VI)-CAS-CTAB-F multicomponent complex. This method was of high selectivity and sensitivity (Mol absorption spectrum coe-ffient Σ=1.1×105), and could be used satisfactorily for determination of U(VI) in water, waste water, soil and ores.

本文报道了用N235-二甲苯-盐酸混合体系,在强酸介质中萃取铀(VI),并用盐酸-氯化钠进行反苹取反应最佳条件。经过铀(VI)的选择性萃取,反萃取与富集,然后用U(VI)-CAS-CTAB多元络合物测定超痕量铀(0.5ppb级以上)。本法最大特点是具有较高的选择性和灵敏度,摩尔吸光系数∑=1.1×10~5,当log(I_o/I_t)=0.001时,其灵敏度为0.002μg/cm~2。此方法用于测定水、废水、土壤和多金属矿中痕量或超痕量铀,操作简便快速,结果十分满意。

A modified electrode with 8-Hydroxyquinoline was deviced by strong absorption method for analyzing the trace Zinc in human body. As the 8-Hydroxyquinoline on the modified electrode can form a hydrophobic chelates with zinc, the sensitivity and the selectivity of this method are thus intensified. Direct determination of samples from human blood is possible instead of adding Gallium to prevent formation of copperzinc compound on electrode as previously done. The detection limit is about 7.6× 10-10mol/L. Recovery...

A modified electrode with 8-Hydroxyquinoline was deviced by strong absorption method for analyzing the trace Zinc in human body. As the 8-Hydroxyquinoline on the modified electrode can form a hydrophobic chelates with zinc, the sensitivity and the selectivity of this method are thus intensified. Direct determination of samples from human blood is possible instead of adding Gallium to prevent formation of copperzinc compound on electrode as previously done. The detection limit is about 7.6× 10-10mol/L. Recovery of zinc is about 93.4 +5.7% (X±SD). The variant coefficient CV = 6.1%.

本文用强吸附法研制了8-羟基喹啉化学修饰电极,并将其用于人体中痕量锌的分析。由于修饰电极上的8-羟基喹啉能与锌生成疏水性螯合物,从而大大提高了电极的选择性富集效率,使此法具有较高的灵敏度和较好的选择性。在测定血液、头发、指甲等人体样品时,一般不需加镓克服电极上铜锌互化物的生成,就可直接测定锌,方法检出下限为7.6×10~(10mol)/L(受空白所限)。实测人体样品,锌的回收率为93.4±5.7%(X±SD),变异系数CV=6.1%。

We used the High Pressure Wet Digestive method in the pre'.reatment-of the samples of human body materials with satisfactory rcsul:.s. This method prevented the loss of Selenium caused by evaporation during digestion. We studied the method of determination for trace Selenium in human body by using differential pulse polarography (stripping voltammetry). Through experiments, we obtained the best condition for t.he determination of trace Selenium by voltammetry .The detection limit of this method was 2×10-10mol/L,...

We used the High Pressure Wet Digestive method in the pre'.reatment-of the samples of human body materials with satisfactory rcsul:.s. This method prevented the loss of Selenium caused by evaporation during digestion. We studied the method of determination for trace Selenium in human body by using differential pulse polarography (stripping voltammetry). Through experiments, we obtained the best condition for t.he determination of trace Selenium by voltammetry .The detection limit of this method was 2×10-10mol/L, and retrieve ratio was 102.8±7.8%(x±SD), with the varia've coefficient being CV = 7.1%. The data were obtained from analyzing some samples of human body materials (hair, uterine villi, serum of umbilical cord, and gravida amhio'.ic fluid etc). Satisfactory results were obtained in all experiments.

本文用高压湿法消化器做人体样品预处理,有效地防止了消化过程中硒的挥发损失。应用微分脉冲阴极溶出伏安法研究了人体样品中痕量硒的测定方法,通过实验,确定了最佳测试条件,方法的检出下限为2×10~(-10)mol/L。实测人体样品,硒的回收率为102.8±7.3%((?)±SD),变并系数CV=7.1%。用本法检测了头发、子宫绒毛、脐带血清、孕妇羊水等样品中的痕量硒,均获得满意结果。

 
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