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微乳液介质中meso-四(3-羟基苯基)卟啉与铅显色反应的研究 总被引:5,自引:0,他引:5
研究了在TritonX 10 0 /正丁醇 /正庚烷 /水组成的非离子型微乳液中Pb(Ⅱ )与meso 四(3 羟基苯基 )卟啉 [T(3 HP)P]的显色反应。结果表明 ,微乳液较TritonX 10 0胶束体系有更好的增溶增敏作用。在混合掩蔽剂氟化钠 柠檬酸 乙二胺及pH 10 .0的硼砂 氢氧化钠缓冲液中 ,经沸水浴加热 3min ,Pb(Ⅱ ) T (3 HP)P在微乳液和少量过氧化氢中形成配合物 ,ε4 6 6 =1.5 0×10 5L·mol- 1·cm- 1,Pb(Ⅱ )在 0~ 11μg/2 5ml内遵守比耳定律 ,对样品中微量铅的测定结果满意。 相似文献
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The effects of a static magnetic field on the microwave absorption of hydrogen plasma in carbon nanotubes: a numerical study 下载免费PDF全文
We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton-Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction on the microwave absorption of hydrogen plasma in CNTs are studied in detail. The numerical results indicate that the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes can be obviously improved when the exter- nal static magnetic field is applied to the material. It is found that the specified frequency microwave can be strongly absorbed by the hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes over a wide range of incidence angles by adjusting the external magnetic field intensity and the parameters of the hydrogen plasma. 相似文献
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合成了8种不对称变色酸双偶氮氟胂型新显色剂,并研究了它们与钍的显色反应,建立了最佳反应体系。试验发现由于引入了吸电子性极强的氟取代基,反应体系的酸度、选择性及灵敏度大为提高,是一组很好的测钍显色剂。 相似文献
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The effects of static magnetic field on microwave absorption of hydrogen plasma in carbon nanotubes: A numerical study 下载免费PDF全文
We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed highpressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton–Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction on the microwave absorption of hydrogen plasma in CNTs are studied in detail. The numerical results indicate that the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes can be obviously improved when the external static magnetic field is applied to the material. It is found that the specified frequency microwave can be strongly absorbed by the hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes over a wide range of incidence angles by adjusting the external magnetic field intensity and the parameters of the hydrogen plasma. 相似文献
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Rehybridization of electronic orbitals in carbon nanotubes contains tilting angles of π orbital, electrons wavefunctions of π orbital and a orbital, degrees of hybridization, etc. In this paper, we have obtained analytical formulas of tilting angle of π orbital relative to tube surface, electrons wavefunctions of π orbital and a orbital, degrees of hybridization, separately, as well as the numerical results. 相似文献
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