共查询到20条相似文献,搜索用时 93 毫秒
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白玉蜗牛微量元素的测定方法研究 总被引:1,自引:0,他引:1
以高压硝化罐硝化样品,采用电感耦合等离子体原子发射光谱(ICP-AES)法和火焰原子吸收(AAS)法分别测定了白玉蜗牛中的Ca,Mg,Fe,Zn,Cu,Co六种微量元素的含量, 并对两种分析方法进行分析比较, 结果表明,ICP-AES法和AAS法测定的微量元素无显著性差异。 方法回收率在92.4%~103.0%之间,相对标准偏差均小于2.98%。 实验证明,白玉蜗牛含有丰富的有益微量元素,是一种营养价值极高的绿色食品。 相似文献
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本文对近年来原子光谱分析间接测定法的进展及应用进行了综述,内容包括:方法原理、AAS间接法、ICP-AES间接法和FIA-AAS间接法。附参考文献57篇。 相似文献
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ICP-AES测定车用无铅汽油中的铅 总被引:3,自引:0,他引:3
ICP-AES测定车用无铅汽油中的铅含量,与标准中规定的测定方法(AAS)相对照,结果显示,ICP-AES测定的铅含量与AAS法测定值基本相同。RSD(n=11)小于4.37%。本方法操作简便、分析速度快、结果准确。 相似文献
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研究了土壤中钒的3种测定方法,ICP-AES、石墨炉原子吸收光谱法和X射线荧光光谱法.其中ICP-AES选用谱线V 311.1nm,用干扰系数法,干扰系数用多个土壤标样的标准值和测定值的最小二乘法来确定;石墨炉原子吸收光谱法用新、旧石墨管(热解涂层),加与不加基体改进剂(硝酸镁)分别进行测试;X射线荧光光谱法样品无需前处理、无需做校准曲线,测定前仪器用自带校正钢片单点法进行校正.通过测试结果的比较得出:ICP-AES测定土壤标样中的钒,精密度高,准确度好,适合土壤中钒的实验室分析;石墨炉原子吸收光谱法灵敏度过高(高一个数量级),信号稳定性较差,对高温元素钒的测定最好加硝酸镁机体改进剂消除基体干扰且每只石墨管分析次数不超过100次;X荧光光谱法较适合于野外监测或土壤样品无损检测,操作方便快速. 相似文献
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采用几种消解方法对样品进行前处理,建立了电感耦合等离子体-原子发射光谱法(ICP-AES)同时测定导热硅脂中铅、镉等有害金属元素的方法.结果表明:高温灰化法Pb、Cd有损失;(1 1)王水湿法消解法Pb有损失;硝酸-高氯酸湿法消解法Pb和Cd几乎无损失;该方法精密度范围为0.22%-2.40%,Pb和Cd检出限分别为0.030μg·mL-1和0.006μg·mL-1.与石墨炉原子吸收光谱法(GFAAS)相比,ICP-AES具有简单、快速、准确等特点. 相似文献
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Quantum fluctuations of the number of photons of the fundamental mode and of the second harmonic in the process of intracavity
generation of the second harmonic in the unstable region of the system are studied. The distribution functions of the number
of photons of interacting modes are calculated in the positive P-representation. The functions of the joint distribution of the number of photons of the fundamental mode and the number of
photons in the second harmonic are also studied. 相似文献
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L. Wojtczak S. Romanowski W. Stasiak B. Mrygoń 《Czechoslovak Journal of Physics》1981,31(9):1024-1036
The density of electronic states and its spatial distribution in thin films are considered including the electron correlations in the coherent phase approximation applied to the intra-atomic interaction. This new approach allows us to derive the line shape for electronic levels which is important from the point of view of the convergency for the density function in the case of systems with restricted dimensions. Detailed calculations are performed for 4s copper film functions with the fcc lattice and various crystallographic orientations of the surfaces.The authors are very grateful to Professor L. Valenta (Prague) for his kind interest in this paper and to Dr. J. Mizia (Cracow) for helpful discussions. We would like to express our gratitude to Professor M. Wonicki and Mrs M. Firszt (Toru) for their help in obtaining the computer program procedure for two-particle interaction integrals calculations.The paper has been done in the framework of the Problem M.R I-11. 相似文献
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依据GB/T 19941-2005标准,测定了皮革中的甲醛含量,对测量结果的不确定度来源进行了分析和评定,并计算出合成不确定度和有效自由度,最后根据JJF1059规范要求给出了甲醛测量不确定度表达式. 相似文献
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V. Violet Dhayabaran J. Princy Merlin I. Sharmila Lydia R. Shanthi R. Sivaraj 《Ionics》2004,10(3-4):288-290
The influence of Fluorescein in conjunction with calcium oxide on the corrosion of Aluminium in 1.0 N NaOH was studied by
galvanostatic studies and weight loss studies. It has been found that the inhibition of corrosion of aluminium increased with
the increasing concentration of the inhibitor. The maximum inhibition efficiency of fluorescein alone was found to be 30.80%.
However, the addition of calcium oxide increased the maximum inhibition efficiency to 53.71%. The corrosion process was found
to be under the anodic control, in the presence or in the absence of inhibitor. The inhibition was found to be mixed type.
Paper presented at the 2nd International Conference on Ionic Devices, Anna University, Chennai, Inida, Nov. 28–30, 2003. 相似文献
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N. N. Matveev A. S. Sidorkin N. S. Kamalova N. Yu. Evsikova V. I. Lisitsyn 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(9):1158-1160
The emergence of differences in potential in a natural macromolecular heterogeneous structure (wood) upon natural changes in temperature with allowance for humidity is considered. It is shown that the magnitude of the emerging difference in potential in the wood is proportional to the change in temperature and grows along with the humidity of the wood. 相似文献
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The formation of an S-shaped volt-ampere characteristic (VAC) during the heating of a specimen of n-type indium antimonide by a dc electric current in the presence of an external magnetic field is considered. In the calculation of the VAC the temperature dependences of the band gap width, the carrier density, the mobility, and the heat conductivity are taken into account. The angle of deflection of IR-radiation in indium antimonide is calculated using the density distribution over the cross section of the specimen derived from the integration of heat conductivity equation. The experimental and theoretical dependences of the deflection angle on the current are in agreement in order of magnitude and indicate that it is possible to use the temperature instability for the construction of laser radiation deflectors in the IR range.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 35–40, November, 1984.The authors are grateful to V. L. Bonch-Bruevich and I. P. Zvyagin for useful discussion and valuable critical remarks. 相似文献
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