ICP-AES测定铜精矿中的Ag含量及与AAS的比较

铜精矿样品经盐酸、硝酸、氢氟酸、高氯酸分解完全后,用10％的盐酸溶液(V/V)定容至50mL容量瓶中,应用电感耦合等离子体-原子发射光谱法(ICP-AES)测定其中的银含量.该方法的加标回收率为95.4％-97.2％,相对标准偏差(RSD)为1.26％,线性范围宽,具有良好的准确性和精密度,测定结果与AAS法吻合.与AAS法相比较,ICP-AES法具有更宽的线性范围,受介质盐酸溶液浓度的影响较少,适合用来测定铜精矿中的Ag.     

黑米中微量元素含量的测定

采用高压密封消解罐法对样品进行处理,以电感耦合等离子体-原子发射光谱法(ICP-AES)和原子吸收光谱法(AAS)测定黑米中Mn、Cu、Fe、Mg等微量元素的含量,lCP-AES更佳.回收率为92.2%-109%,相对标准偏差小于2.67%.实验证明,黑米含有丰富的对人体有益微量元素,是一种健康食品.     

扇贝微量元素的测定

以高压硝化罐消化样品,利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)法分别测定了扇贝中的Zn,Co,Fe,Mn,Mg,Ca,Cu,K共八种微量元素的含量, 并对两种分析方法进行了分析比较b 结果表明,ICP-AES法和AAS法测定的微量元素无显著性差异, ICP-AES稍优。方法回收率在93.3%～102.8%之间,相对标准偏差均小于1.60%。扇贝含有丰富对人体有益微量元素,不但味道鲜美,而且可以补充人体所必需的微量元素。     

白玉蜗牛微量元素的测定方法研究

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。     

ICP-AES测定口香糖中的Ti

以碱熔法处理样品,电感耦合等离子体-原子发射光谱法(ICP-AES)快速测定口香糖中的Ti,相对标准偏差为0.22%,回收率在97.0%-100.0%之间,可应用于各种口香糖中Ti的测定.     

原子光谱分析中的间接测定法

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。     

ICP-AES测定车用无铅汽油中的铅

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。     

ICP-AES、石墨炉原子吸收光谱法及X射线荧光光谱法测定土壤中钒的比较

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.     

电感耦合等离子体-原子发射光谱法测定CPU导热硅脂中的铅和镉

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.     

微波消解-ICP-AES测定保鲜水果中硫含量

用硝酸-过氧化氢(4+2)混合溶液作为消解剂,微波消解法处理保鲜水果样品,采用电感耦合等离子体-原子发射光谱法(ICP-AES)测定所得样品溶液中硫的含量,选择182.0nm为测定硫的分析线,硫的检出限(3Sd)为0.065mg·L-1,样品测定的相对标准偏差(n=8)为1.90%用本法测定两个国家标准物质茶叶(GBW...     

Fluctuations in number of photons in region of unstable behavior in process of intracavity generation of second harmonic

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.     

Correlation in calculations of density of states in thin films

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.     

一种在弱酸性介质中有电化学发光性能的鲁米诺衍生物

报道了一种鲁米诺的衍生物-3-(1-乙酰丙酮偶氮)苯二甲酰肼在酸性介质中的电化学发光行为,该化合物与鲁米诺类似,发生两步电化学氧化反应,但其氧化电位较鲁米诺低约0.5V,在氧化铟锡玻璃电极上具有良好的电化学发光性能,有效地避免了氧化铟锡玻璃电极本身的发光干扰.不仅在碱性介质中具有较高的电化学发光效率,而且在酸性介质中也产生较稳定的电化学发光,在1.0×10-6mol/L以上浓度,电化学发光强度与浓度有良好的线性关系.     

皮革中甲醛含量测量不确定度评估

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.     

Inhibition of corrosion of aluminium in presence of fluorescein in basic medium

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.     

Emergence of differences in potential in wood as a result of natural changes in temperature

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.     

Deflection of IR-radiation in n-InSb in the presence of temperature-electrical instability in a magnetic field

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.