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copper determination     
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     In the conditions mentioned in this paper sensi tivity of copper determination by atom trapping is 191 times higher than with the commen ASS method cancentration multiplication of lon exchange methed can at least reach 40times, thus raising the sentvity of copper determanition 7640 times, so that the determination of ultratrace copper in water at the ppt level can done suceefuly
     在本文所述条件下,用原子捕集法测定的灵敏度较常规法高191倍,再考虑到离子交换法的浓缩倍数至少可达40倍,因此至少可使的测定灵敏度提高7640倍,从而成功地测定了水中千分之几—千分之几PPb级的超痕量
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     This paper introduced the best pH regain of ammonium chloride buffer in Copper determination with Sodium diethyldithiocarbamate colorimetry is 8.0~9.0 for satisfy result.
     二乙氨基二硫代甲酸钠萃取光度法测,所用氯化铵-氢氧化铵缓冲溶液pH在80~90之间,测定结果较好。
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     Pretreating method for iron and copper determination in coated paper
     浆层纸中铁、含量测定的预处理方法
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     COPPER DETERMINATION IN CULTURED SKIN FIBROBLASTSA NEW WAY FOE STUDYING HEPATOLENTICULAR DEGENEEATION
     体外培养皮肤成纤维细胞中含量的测定——肝豆状核变性研究的新途径
短句来源
     The sclectivity and the sensitivity of copper determination can be increased by applying cetyl trimethyl ammonium bromide(CTAB) as surfactant.
     利用表面活性剂溴化十六烷基三甲铵(CTAB) ,提高对测定的选择性和灵敏度 ,其相对荧光强度与离子浓度在 0 .4 933~ 5 .5 6 2μmol·L-1范围内呈良好的线性关系 .
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  铜测定
     When the first wave of the reduction of copper at the glassy carbon electrode was applied to copper determination, the interference of some ions could be avoided, such as Tl~+, which interfered with copper in polarographic analysis using a dropping mercury electrode.
     在极谱法中用的第二个波有[Co(NH_3)_6]~(3+)前波及Tl~+重波,它们在第一个波中均变为后波,从而克服了它们对铜测定的干扰。
短句来源
     The sclectivity and the sensitivity of copper determination can be increased by applying cetyl trimethyl ammonium bromide(CTAB) as surfactant.
     利用表面活性剂溴化十六烷基三甲铵(CTAB) ,提高对铜测定的选择性和灵敏度 ,其相对荧光强度与铜离子浓度在 0 .4 933~ 5 .5 6 2μmol·L-1范围内呈良好的线性关系 .
短句来源
  铜的测定
     Trace Copper Determination in Electrolyte of Dry Cells
     干电池电解液中微量铜的测定
短句来源
     In the conditions mentioned in this paper sensi tivity of copper determination by atom trapping is 191 times higher than with the commen ASS method cancentration multiplication of lon exchange methed can at least reach 40times, thus raising the sentvity of copper determanition 7640 times, so that the determination of ultratrace copper in water at the ppt level can done suceefuly
     在本文所述条件下,用原子捕集法测定铜的灵敏度较常规法高191倍,再考虑到离子交换法的浓缩倍数至少可达40倍,因此至少可使铜的测定灵敏度提高7640倍,从而成功地测定了水中千分之几—千分之几PPb级的超痕量铜。
短句来源
     The paper puts forward some improvement made on the existing method: remove Fe~(3+),and Al~(3+)by OH-ion precipitation and make Cu~(2+)react with BCO with PH at 8.5~9.3.This method,proved to be reliable and quick in determination,can satisfy the need of trace copper determination in average laboratories.
     本法对已有的方法进行了改进:采用OH-离子沉淀去除Fe3+、A l3+,在pH值为8.5~9.3的环境下让Cu2+与BCO进行显色反应. 研究证实:改进后的方法分析可靠,测定快速,能满足一般化验室对铁矿石中微量铜的测定需要.
短句来源
     Most ions existing in fresh water samples did not interfere with the copper determination.
     天然水样中可能存在的离子不干扰铜的测定
短句来源
     CONCLUSION:The method proved to be suitable for trace copper determination of the Chinese herbal medicine.
     结论:此方法适用于中药饮片中的微量铜的测定
短句来源
  测铜
     This paper introduced the best pH regain of ammonium chloride buffer in Copper determination with Sodium diethyldithiocarbamate colorimetry is 8.0~9.0 for satisfy result.
     二乙氨基二硫代甲酸钠萃取光度法测铜,所用氯化铵-氢氧化铵缓冲溶液pH在80~90之间,测定结果较好。
短句来源

 

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      copper determination
    The duration of the copper determination is 1.5 h and that of the tellurium determination, 4 h.
          
    INAA for the validation of chromium and copper determination in copper chromite by infrared spectrometry
          
    Limit of the INAA procedure for copper determination based on the64Cu 511 keV line
          
    An activation analytical copper determination method is described using a radioactively labelled reagent for correction of separation losses.
          
    Results of copper determination in NBS 1570 /Spinach/, IAEA H-4 /Animal muscle/ and IAEA V-8 /Rye flour/ are presented.
          
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    The cathodic voltammetric characteristics of copper with linearly changing tension at the glassy carbon electrode in NH_3-NH_4Cl were studied in detail. The electrode reaction, peak tension, reversibility, peak current and temperature coefficient were investigated. Experimental results showed that the reduction of cuprammine complex cation was proceeded stepwisely at the glassy carbon electrode. Cu(NH_3)_4~(2+) was first reduced reversibly to Cu (NH_3)_2~+, then to Cu irreversibly.In 2.5M NH_3-0.75M NH_4Cl,...

    The cathodic voltammetric characteristics of copper with linearly changing tension at the glassy carbon electrode in NH_3-NH_4Cl were studied in detail. The electrode reaction, peak tension, reversibility, peak current and temperature coefficient were investigated. Experimental results showed that the reduction of cuprammine complex cation was proceeded stepwisely at the glassy carbon electrode. Cu(NH_3)_4~(2+) was first reduced reversibly to Cu (NH_3)_2~+, then to Cu irreversibly.In 2.5M NH_3-0.75M NH_4Cl, the experimental peak tension of the first wave was-0.28V (vs. S. C. E.) in close agreement with the value calculated from the theoretical equation. Experimental peak currents showed linear relationships with both the concentration of copper and the square root of the rate of tension change, obeying the Randles-(?)evěik equation. The temperature coefficient of the peak current was about + 1.3%/℃.The roduction of Cu(NH_3)_2~+ had a higher ovortension. The experimental peak tension of the second wave varied from -0.69~-0.84V (vs. S. C. E.) as the rate of tension change increased from 1.04~100 mV/s. Experimental peak currents were proportional to the concentration of copper in a narrower range.When the first wave of the reduction of copper at the glassy carbon electrode was applied to copper determination, the interference of some ions could be avoided, such as Tl~+, which interfered with copper in polarographic analysis using a dropping mercury electrode. Results from determination of copper in minerals were in agreement with the data of standard samples and those obtained by the oscillographic polarographic method. The relative standard error of this method is less than±3.2%.

    本文研究了NH_3-NH_4Cl溶液中铜在稳定玻璃碳电极上的线性变势阴极伏安特性。确定铜氨络离子在玻璃碳电极上的还原分两步进行。在2.5MNH_3-0.75MNH_4Cl中,第一个波是Cu(NH_3)_4~(2+)可逆地还原到Cu(NH_3)_2~+,其峰电势为-0.28伏,与理论值一致。峰电流与电势变化速度及浓度的关系符合Randles-evcik方程。第二个波是Cu(NH_3)_2~+不可逆地还原为铜,当电势变化速度改变时,其峰电势在-0.69~-0.84伏之间。第一个波峰电流的相对标准误差不大于±2.4%,温度系数约为+1.3%/度。本文在氨性底液中用铜在玻璃碳电极上还原的第一个波以测定铜矿中的铜。在极谱法中用的第二个波有[Co(NH_3)_6]~(3+)前波及Tl~+重波,它们在第一个波中均变为后波,从而克服了它们对铜测定的干扰。测定结果与标准样的数据吻合,与示波极谱的数据一致。测定矿样的相对标准误差在±0.37~3.2%之间,符合矿石分析的要求。

    In recent years, the relationship between trace element zinc and senile cataract has aroused increasing academic interest. Zinc metabolism was studied in sixteen cases of senile cataract with six normal individuals as control group, in order to approach the association of zinc with senile cataract. The sixteen patients were diagnosed, hospitalized and had no any complication. No family history of senile cataract was noted in the six normal individuals. Fasting serum zinc and copper concentrations and twenty-four-hour...

    In recent years, the relationship between trace element zinc and senile cataract has aroused increasing academic interest. Zinc metabolism was studied in sixteen cases of senile cataract with six normal individuals as control group, in order to approach the association of zinc with senile cataract. The sixteen patients were diagnosed, hospitalized and had no any complication. No family history of senile cataract was noted in the six normal individuals. Fasting serum zinc and copper concentrations and twenty-four-hour urinary zinc excretion were assayed. Zinc tolerance tests were performed in which serum samples were obtained at regular intervals after oral zinc intake tenfold equivalent to the total plasma zinc for zinc and copper determination by means of Shimadzu AA-640-13 atomic absorption spectrophotometer (AAS). The fasting serum zinc concentrations of patients and healthy individuals were found to be 101.9 ±16.0 μg/dl and 125.7±13.6 ,μg/dl respectively, the difference between them showed a very marked statistical significance (P<0.01), and fifty six percent of patients had a value of 103.0μg/dl, which is below the lower limit of the normal value in our study, indicating that the senile cataract is in low serum zinc status. The twenty-four-hour urinary zinc excretions of patients and control group were 682.4 ± 387.0μg and 250.0 ±118.2μg respectively, the difference being striking (P<0.05), and seventy one percent of patients had a value of 435.0μg, which is the upper limit of normal in our study. Oral zinc tolerance curves indicated that the interval required to achieve the peak serum values is similar in the two groups-two hours after zinc intake, but the peak values of patients and control group were found to be 238.0 ± 27.0μg/dl and 282.0 ± 25.0μg/dl respectively, also showing a striking difference (P<0.05), demonstrating the existance of disturbances in gastrointestinal absorption of zinc in the patient group. The authors believe that there exists an abnormal zinc metabolism in patients with senile cataract. The disturbance in gastrointestinal absorption of zinc and hyperzincuria lead to hypozincernia, suggesting that zinc deficiency possibly has an important bearing on the etiology and pathogenesis of senile cataract. Since many data indicated a close correlation between trace elements zinc and copper, the serum copper levels were assayed in the meantime. Results obtained seemed to indicate that copper is of no significance inthe formationof senile cataract, and no correlation was found between copper levels and the zinc metabolism.

    微量元素锌与老年性白内障的关系已日益引起国内外学者的关注。本文通过16例老年性白内障及6例健康对照者锌代谢的研究,探讨锌与老年性白内障之间的关联。本研究通过测定空腹血清锌和铜、24小时尿锌排泄量及锌耐量试验,对体内微量元素锌、铜的代谢进行探讨。锌耐量试验是口服相当于全身血浆含锌总量10倍的锌,定时采血并测定血清锌、铜值。微量元素分析所用的仪器系日本岛津AA-640-13原子吸收光谱仪。研究结果表明,患者空腹血清锌(101.9±16.0μg/(L)),显著低于对照组(125.7±13.6 μg/(L)),P<0.01;且56%的患者血清锌低于对照组的下限(103.0μg/(L)),说明老年性白内障处于低血锌状态。患者24小时尿锌排泄量(682.4±387.0μg/24h),显著高于对照组(250.1±118.2μg/24h),P<0.05:且71%的患者尿锌高于对照组的上限(435.0μg/24h)。锌耐量曲线显示,两组皆于口服锌后2小时血清锌浓度上升到最高水平,但对照组峰值(282.0±25.0μg/(L))显著高于患者(238.0±27.0μg/(L)),P<0.05,说明患者存在胃肠锌吸收障碍。作者认为,...

    微量元素锌与老年性白内障的关系已日益引起国内外学者的关注。本文通过16例老年性白内障及6例健康对照者锌代谢的研究,探讨锌与老年性白内障之间的关联。本研究通过测定空腹血清锌和铜、24小时尿锌排泄量及锌耐量试验,对体内微量元素锌、铜的代谢进行探讨。锌耐量试验是口服相当于全身血浆含锌总量10倍的锌,定时采血并测定血清锌、铜值。微量元素分析所用的仪器系日本岛津AA-640-13原子吸收光谱仪。研究结果表明,患者空腹血清锌(101.9±16.0μg/(L)),显著低于对照组(125.7±13.6 μg/(L)),P<0.01;且56%的患者血清锌低于对照组的下限(103.0μg/(L)),说明老年性白内障处于低血锌状态。患者24小时尿锌排泄量(682.4±387.0μg/24h),显著高于对照组(250.1±118.2μg/24h),P<0.05:且71%的患者尿锌高于对照组的上限(435.0μg/24h)。锌耐量曲线显示,两组皆于口服锌后2小时血清锌浓度上升到最高水平,但对照组峰值(282.0±25.0μg/(L))显著高于患者(238.0±27.0μg/(L)),P<0.05,说明患者存在胃肠锌吸收障碍。作者认为,老年性白内障患者存在着锌代谢异常。胃肠道锌吸收障碍与尿锌排泄增多导致低血锌状态。提示锌缺乏在老年性白内障的病因和发病学中可能起着重要的作用。鉴于许多资料表明微量元素铜与锌密切相关,故在本课题研究锌代谢的同时也观察了血清铜的水平。结果表明铜在老年性白内障的形成中无特殊意义,其与患者锌代谢的异常变化亦无相关性。

    A method for the determination of inorganic and total copper in urine by graphite furnace atomic absorption spectrometry after separation and concentration using APDC precipitation has been developed,Inorganic copper was determined after APDC precipition without urine decomposition.Total copper was determined either by direct furnace atomic absorption spectrometry after urine dilution with 0.01 M nitric acid or after urine decomposition with nitric acid and perchloric acid and separation with APDC precipitation....

    A method for the determination of inorganic and total copper in urine by graphite furnace atomic absorption spectrometry after separation and concentration using APDC precipitation has been developed,Inorganic copper was determined after APDC precipition without urine decomposition.Total copper was determined either by direct furnace atomic absorption spectrometry after urine dilution with 0.01 M nitric acid or after urine decomposition with nitric acid and perchloric acid and separation with APDC precipitation. Then, the Cu-PDC complex precipitate was dissolved in MIBK and organic phase was introduced into graphite furnace. The optimal conditions for copper precipitation were found to be 0.2-2.0 M of HC1O4 and 0.5-3.0ml of 2% (W/V) APDC solution if the initial volume of aqueous phase for precipitation was 3ml.The subtraction of inorganic copper from total copper yielded the organic copper concentration in urine. In addition, an independent procedure was described to check the accuracy and reliability of organic copper determination. Urine samples were collected from nephritis patients and protein was separated from urine and decomposed with nitric acid and perchloric acid. Then, copper was precipitated with APDC and determined by furnace atomic absorption spectrometry. A good agreement was achieved between this procedure and the subtraction method.The recommended method has been applied for real sample analyses. The inorganic and total copper in urine samples collected from healthy people were found to be in the range of 5.3-12.5, and 6.7-16.3μg/l, respectively. The relative standard deviation was found to be 5.6% for 8 replicate determinations of urine sample containing copper of 14.3μg/l after acid decomposition and APDC precipitation.

    本工作研究了APDC沉淀分离富集和石墨炉原子吸收测定尿中无机铜、有机铜和总铜的最佳条件,并已应用于健康人和病人尿中不同形态铜的测定。

     
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