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determination of se     
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  测定硒
     The optimum instrument parameters and work conditions were selected. The effects of silver matrix on determination of Se and Te were eliminated by adding Cs as internal standard and the determination results were accurate and reliable. The determination limits for Se and Te were 0.1 and 0.06μg/g and the RSD were less than 5% with 92.6%~103.5% recoveries.
     通过加入内标Cs消除基体银的基体效应对测定硒碲的干扰,测定结果准确、可靠,方法测定下限为0.1和0.06μg/g,相对标准偏差<5%,加标回收率92.6%~103.5%。
短句来源
     Determination of Se by ICP-AES and fluorometry;
     ICP-AES和荧光法测定硒;
短句来源
     Study on simultaneous determination of Se and As by the sequential injection hydride generation atomic fluorescence spectrometry
     顺序注射氢化物发生-原子荧光光谱法同时测定硒和砷的研究
短句来源
     Determination of Se in Xilin capsule by oxygen flask combustion-ultraviolet spectrometry
     氧瓶燃烧-紫外分光光度法测定硒灵胶囊中硒的含量
短句来源
     THE DETERMINATION OF SE CONTENT IN SE EGG BY NAA IN MNSR
     微堆中子活化法测定硒鸡蛋中硒含量
短句来源
更多       
  了硒测定
     The method is able to decrease the loss of Se in sample decomposition,shorten the time of complexing and extraction and raise accuracy of the determination of Se.
     该方法使样品消化过程中的硒损失大为减少,使络合萃取时间变短,提高了硒测定的精密度和准确度。
短句来源
  se的含量
     Optical Temperature-control Graphite Furnace Atomic Absorption Spectrometric Determination of Se in Serum and hair
     光温控制石墨炉原子吸收法测定人血清和人发中Se的含量
短句来源
  硒的测定
     Linearity range of the method is 0.4~30 μg·L -1 and detection limit is 0.23 μg·L -1 . The method is of sensitivity and selectivity, and has been applied to the determination of Se in real samples of water and garlic with satisfied results. Preliminary explanation of mechanism is presented.
     线性范围为0.4~30μg·L-1,检出限为0.23μg·L-1。 方法简便灵敏、选择性好,用于水和蒜样中硒的测定,结果满意。
短句来源
     The experiment results show that Beer's law is obeyed in the range of 0~1.0 μg for Se(Ⅳ) with detection limit of 0.03 μg/L. The recovery of standard addition is 91%~105% with precision of less than 7% RSD(n=6). The method has been applied to the determination of Se in the underground water with the satisfactory results.
     实验表明,荧光光度法测定硒的线性范围为0~1.0μg,最低检测浓度为0.03μg/L,应用此法测定0.1μg/L硒的地下水,相对标准偏差小于7%,回收率达91%~105%,可满足地下水中硒的测定要求。
短句来源
     The method has beenapplied to the determination of Se in the water samples ,and the results obtained are satisfactory
     该方法用于水样中痕量硒的测定,结果令人满意。
短句来源
     A method has been developed for the direct determination of Se in Pueraria lobata(Willd)Ohwi by graphite furnace atomicabsorption spectrometry.
     建立一种简便、快速、准确的食品中硒的测定方法;
短句来源

 

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      determination of se
    Several analytical methods were tested for the simultaneous determination of (Se(IV) and Se(VI) in the quenched samples.
          
    The aim of this present study is to develop a suitable method for the determination of Se in red blood cells (RBC) using ICP-MS after microwave digestion.
          
    The determination of Se, Mg and Mn concentrations in leukocyte subfractions
          
    Application of ENAA allowed nondestructive determination of Se concentration down to ppm level in spite of the presence of high Co, Fe, Ni and Cr contents in the samples.
          
    In this work the determination of Se by epithemal neutron activation analysis (ENAA) in 17 samples from Cuban nickel industry was investigated.
          
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    Lactic dehydrogenase and its iso-enzymes of the serum and body fluidwere determined in 665 cases, in which290 cases were with various cancer, 210cases non-cancer and 165 normal sub-jects. The total serum LDH activity in-creased in various cancer patients invariable degrees. There was significantdifference between cancer and non-cancer patients(P<0.01). Among the 70cases with hepatoma and the 43 caseswith malignant tumors of the ovary thepercentage of serum LDH activity abovenormal value were 91.4 and 79.1 res-pectively....

    Lactic dehydrogenase and its iso-enzymes of the serum and body fluidwere determined in 665 cases, in which290 cases were with various cancer, 210cases non-cancer and 165 normal sub-jects. The total serum LDH activity in-creased in various cancer patients invariable degrees. There was significantdifference between cancer and non-cancer patients(P<0.01). Among the 70cases with hepatoma and the 43 caseswith malignant tumors of the ovary thepercentage of serum LDH activity abovenormal value were 91.4 and 79.1 res-pectively. It was observed that the totalLDH activity of body fluid was higherthan that of serum in cancer patients.The positive percentage of gastric juiceof gastric cancer and ascitic fluid ofhepatoma were 89.2% (83/93 cases)and00% (10/10 cases) respectively. The LD_3 of serum LDH isoenzymesincreased in cancer patients. In patientswith malignant tumors of the ovaryand gastric cancer, the percentage ofLD_3 was 27.8 and 22.2 respectively;while in the hepatoma, LD_3, LD_4 andLD_5 increased.The LD_3, LD_4 and LD_5of body fluid from cancer patientswere predominant, such as gastric juiceof gastric cancer (20.5%, 29.0%, 32.0%),ascitic fluid of hepatoma(13.7%, 12.6%,26.8%) and the chest fluid of the lungcancer (23.0%, 24.4%, 21.9%). In aword, it was characteristic that theslow migrating fraction (M-type)increased, while the fast migratingfraction (H-type) decreased. Therefore, the determination of se-rum and body fluid total LDH togetherwith its isoenzyme may help to increasethe positive rate of the diagnosis ofcancer.

    作者报告665例血清及体液乳酸脱氢酶及其同工酶的测定,其中癌症患者290例,非癌患者210例,正常人165例。肝癌及卵巢癌患者血清LDH阳性率分别为91.4%及79.1%。同时观察到癌症患者体液LDH高于本人血清LDH。胃癌患者胃液及肝癌患者腹水LDH阳性率分别为89.2%及100%。几种癌症患者血清及体液LDH同工酶谱与正常人及非癌疾病患者有明显区别,作者认为同时测定血清及体液LDH及其同工酶有助于提高癌症患者诊断的阳性率。

    A more simple and accurate Procedure for the determination of selenium in marine biological samples by temperature controlled aluminium blooks fluorometry has been developed. Detailed studies have been made on the effects of digestion conditions (i. e. the ratio and volume of the acid mixture), the digestion temperature and time, the optimum conditions for reducing Se~(+6) to Se~(+4), the optimum PH range of Se-DAN complex formation and the effects of diverse inorganic ions on fluorescence....

    A more simple and accurate Procedure for the determination of selenium in marine biological samples by temperature controlled aluminium blooks fluorometry has been developed. Detailed studies have been made on the effects of digestion conditions (i. e. the ratio and volume of the acid mixture), the digestion temperature and time, the optimum conditions for reducing Se~(+6) to Se~(+4), the optimum PH range of Se-DAN complex formation and the effects of diverse inorganic ions on fluorescence. The recovery rate of the added selenium(0.1—0.2μg)is 95—110% and the relative standard deviation for 0.75—8.3μg·Se/g is 3%. The analytical results by this Procedure are in good agreement with that of the standard reference. The method has been applied to the determination of Se in marine biological samples from the Fujian coastal waters.

    报道了控温铝热块试管消化荧光法测定海洋生物样品中硒的消化条件,即HNO_3-HClO_4配比和用量、消化温度、消化时间、Se~(+6)的还原条件、Se-DAN络合物生成的最佳酸度范围,以及各种共存离子的干扰及其消除方法;给出了方法的精密度、准确度和标准参考物及几种生物样品的实测结果。

    In pH 5.4-5.9 hexamethylenetramine buffer solution, the reaction between Sc, chromazurol S and hexadecypyridinium chloride produces green ternary complex compound at the presence of emulsifier. The mole absorptivity of the complex compound is 1.86·10~5. The total unstability constant is K=4.87·10~(-7) and its formation ratio is Sc: CAS : CPC = 1 : 2 : 3. In the range of 0-10μg Sc_2O_3/50ml, it tallies with Beer's law. The complex compound will keep stable for eight days at least. The effect of over 30 substances...

    In pH 5.4-5.9 hexamethylenetramine buffer solution, the reaction between Sc, chromazurol S and hexadecypyridinium chloride produces green ternary complex compound at the presence of emulsifier. The mole absorptivity of the complex compound is 1.86·10~5. The total unstability constant is K=4.87·10~(-7) and its formation ratio is Sc: CAS : CPC = 1 : 2 : 3. In the range of 0-10μg Sc_2O_3/50ml, it tallies with Beer's law. The complex compound will keep stable for eight days at least. The effect of over 30 substances on the determination of Se has been tested. In determining trace Sc in rock, the result from this method is same as those from the others. The rate of recovery is between 83.00—112.75%. The changeable coefficient is 9.28%.

    在PH5.4—5.9的六次甲基四胺缓冲溶液中,钪与铬天青S(CAS)、氯代十六烷基吡啶(CPC)在乳化剂(OP)存在下生成绿色的三元络合物。络合物摩尔吸收系数为1.86×10~5,总不稳定常数为4.87×10~(-7),钪络合物组成比Sc:CAS:CPC:1:2:3。在0—10μg Sc_2O_3/50ml范围内符合比耳定律。络合物至少稳定8d,并试验了30多种物质对测定钪的干扰。应用于岩石中微量钪的测定,本法与其它方法测定结果一致,回收率在83.00—112.75%之间,变动系数为9.28%。

     
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