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石墨炉原子吸收法测定化妆品中的铅和砷 总被引:3,自引:0,他引:3
本文研究了石墨炉原子吸收法测定化妆品中铅、砷的方法。用湿式消解法消化样品,易掌握。方法简便,灵敏度高。用本方法测定铅的检出限为0.010ng,砷的检出限为0.013ng,相对标准偏差为0.8%-5.2%,方法的回收率为96.1%-105.8%。 相似文献
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本文提出了用ICP发射光谱仪测定保偏光纤应力棒中的二氧化二硼的方法。将应力棒粉碎后,使用HF在压力溶样器中消解,最后溶液的介质为0.5%氢氟酸,并采用耐腐蚀的样品引进系统进行ICP光谱测定。分析程序简单,准确度高,该方法回收率为99~101%,相对标准偏差为1.04% 相似文献
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ICP发射光谱测定保偏光纤应力棒中的三氧化二硼 总被引:1,自引:0,他引:1
本文提出了用ICP发射光谱仪测定保偏光纤应力棒中的三氧化二硼的方法,将应力棒粉碎后,使用HF在压力溶样中消解,最后溶液的介质为0.5%氢氟酸,并采用耐腐蚀的样品引进系统进行ICP光谱测定。分析程序简单,准确度高,该方法回收率为99-101%,相对标准偏差为1.04%。 相似文献
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采用微波溶样技术消解食品样品,用纳氏比色法测定食品中蛋白质。实验结果表明,用微波溶样技术消解食品具有节省时间、节约试剂、消解完全等优点。本方法的相对标准偏差为0.4%-5.3%;回收率为95.0%-102.0%。 相似文献
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火焰原子吸收法测定蜂蜜中的铁 总被引:4,自引:0,他引:4
本文报道了用火焰原子吸收光谱法测定蜂蜜中的铁含量,经与其分分析测定方法比较,该方法具有样品预处理十分简便、无需干法或湿法消解的特点,测定结果令人满意。该方法样品加标回收率为93.0%-109%,相对标准偏差为0.808%-2.62%,检出限为0.08mg/L。 相似文献
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火焰原子吸收光谱法测定磁化杯中铅、镉和铁 总被引:1,自引:0,他引:1
本文研究了火焰原子吸收光谱法测定磁化杯陶瓷内胆中Ph、Cd和Fe含量的方法。样品经粉碎,用硝酸-高氯酸混合液进行消解后测定。本法灵敏度高,干扰少,简单,快速,具有良好的精密度和准确度,其相对标准偏差分别为Pb3.99%,Cd10.7%,Fe0.9%。回收率Pb100.61%,Cd101.18%,Fe102.4%。 相似文献
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ICP-AES法测定耐磨合金钢中Ni、Cr、Mo、V和W等十二种元素 总被引:6,自引:1,他引:5
本文采用王水、硫磷混酸溶解试样,研究了应用ICP-AES技术测定耐磨合金钢中Ni、Cr、Mo、V、W、Zn、Co、La、Ce、Ti、Mn、Cu12种元素的方法。试验了硫酸、磷酸用量对测定的影响和共存离子干扰,方法相对标准偏差为1.40%—3.22%,回收率为96.0%—108.1%。对试样进行分析,结果满意。 相似文献
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The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration ne, degree of 6 ionnization α) from concentration of lithium additive. 相似文献
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Design and analysis of the tunnel connecting the beamcorridor and the spectrum hall of the CSNS 下载免费PDF全文
There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project.The length of the tunnel is about 20 m.The shielding design of the tunnel is very significant for the persons working in the spectrum hall because the tunnel is not covered ed soil for shielding.In order to reduce the dose rate at the exit of the cable ducts,we use the ISIS construction,which is designed with four turnings,as a reference for the tunnel design.The thickness of the shielding is obtained by a simulationwith the Monte Carlo Code FLUKA.The result is compared with the data obtained with Moyer Mode and the reliability of the simulation is proved.This paper provides the basis for the design of the tunnel. 相似文献
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Design and analysis of the tunnel connecting the beamcorridor and the spectrum hall of the CSNS 总被引:1,自引:0,他引:1
There is a tunnel connecting the beamcorridor and the target station in the spectrum hall in the CSNS project. The length of the tunnel is about 20 m. The shielding design of the tunnel is very significant for the persons working in the spectrum hall because the tunnel is not covered by soil for shielding. In order to reduce the dose rate at the exit of the cable ducts, we use the ISIS construction, which is designed with four turnings, as a reference for the tunnel design. The thickness of the shielding is obtained by a simulation with the Monte Carlo Code FLUKA. The result is compared with the data obtained with Moyer Mode and the reliability of the simulation is proved. This paper provides the basis for the design of the tunnel. 相似文献
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文章对微波背景辐射的各向异性、偏振及宇宙电离的历史给出了评述性介绍.从大爆炸理论的预言,到观测的发现,到其各向异性及偏振的探测,微波背景辐射(CMB)向人们揭示了丰富的宇宙学信息.文章在对基本理论作了简单介绍后,着重讲述了最新的CMB的观测结果及其物理意义.特别对微波背景各向异性探测器(Wilkinson Microwave Anisotropy Probe,WMAP)的偏振观测及其对宇宙重新电离的限制给出了较详细的叙述. 相似文献
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T. Rador 《The European Physical Journal C - Particles and Fields》2007,52(3):683-688
Cosmologically stabilizing radion along with the dilaton is one of the major concerns of low energy string theory. One can
hope that T and S dualities can provide a plausible answer. In this work we study the impact of S and T duality invariances
on dilaton gravity. We have shown various instances where physically interesting models arise as a result of imposing the
mentioned invariances. In particular S duality has a very privileged effect, in that the dilaton equations partially decouple
from the evolution of the scale factors. This makes it easy to understand the general rules for the stabilization of the dilaton.
We also show that certain T duality invariant actions become S duality invariance compatible. That is, they mimic S duality
when the extra dimensions stabilize. 相似文献
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Hailiang ZhangMingfu Zhang Jiecai HanGuobing Ying Huaixin GuoChenghai Xu Haitao ShenNingning Song 《Applied Surface Science》2011,257(11):5012-5016
In this paper, MgO film is successfully grown on polycrystalline and monocrystalline alumina substrates using sol-gel method, and polycrystalline and monocrystalline Mg-Al spinels are fabricated by solid state reaction, respectively. The influence of annealing temperature and time on the lattice structure and growth of the formed Mg-Al spinel layer has been investigated. It is indicated that the annealing temperature and time on the as-synthesized polycrystalline Mg-Al spinel has more significant influence than that of single crystal Mg-Al spinel. The thickness of the Mg-Al spinel layer increases with the annealing temperature, both for polycrystalline and for monocrystalline alumina substrates. And the significantly intercrystalline diffusion of Mg2+ ions and Al3+ ions results in a quicker growth velocity of the Mg-Al spinel layer than that of intracrystalline diffusion. 相似文献
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The vibrational relaxation of OCl and OCl− in the bulk and the liquid/vapor interface of water and acetonitrile is studied by molecular dynamics computer simulations. Both equilibrium calculations of the vibrational friction and non-equilibrium simulation of the energy relaxation are used to elucidate the factors that influence the rate of energy relaxation in systems that represent polar ionic and non-ionic solutes in polar protic and non-protic solvents. We find that, in agreement with previous experimental and theoretical studies, the relaxation of the ionic solute is much faster than that of the non-ionic solute in both the solvents. However, while the relaxation is slowed down considerably when the non-ionic solute is transferred from the bulk to the interface, no such surface effect is found in the case of the ionic solute. This behavior can be explained by noting that the ionic solute is able to keep its first solvation shell intact upon transfer to the interface and that the main contribution to the friction is due to the Lennard-Jones part of the intermolecular potential. 相似文献
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A model of symmetries and gauge interactions relating the electron and muon is considered. The model is based on the UL(1)?UR(1)?RL?RR group where UL(1)?UR(1) denotes the chiral e-μ rotation and RL?RR the chiral reflection of the electron field. The invariance under this group is spontaneously broken by the vacuum expectation values of scalar fields. A zeroth-order vacuum is found for which the zeroth-order electron mass vanishes, while one-loop corrections lead to a finite ratio. The decay process μ → e + γ is strictly forbidden in this model. 相似文献