Abstract： Mn/Ba/Al2O3 catalyst for NO oxidation-storage and Pt/Ba/Al2O3 catalyst mixed with Mn/Ba/Al2O3 for NOx storage-reduction by hydrogen were investigated. The results showed that Mn/Ba/Al2O3 had large nitrogen ...Abstract： Mn/Ba/Al2O3 catalyst for NO oxidation-storage and Pt/Ba/Al2O3 catalyst mixed with Mn/Ba/Al2O3 for NOx storage-reduction by hydrogen were investigated. The results showed that Mn/Ba/Al2O3 had large nitrogen oxides storage capacity （397.9 μmolg^-1） under lean burn condition. When Pt/Ba/Al2O3 catalyst was mixed with Mn/Ba/Al2O3 in equal weight proportion, the NOx conversion increased between 250 ℃ and 500 ℃ under the dynamic lean-rich burn conditions, and the maximum NOx conversion increased from 95.4% to 98.2%. Mn/Ba/Al2O3 has promoted NOx storing in the lean stage and improved NOx reduction efficiency in the rich stage, these might result in higher NOx conversion over the low Pt loading content catalyst.展开更多
In this paper, we are going to study the surface structure and existing symmetry by simulation of a quasicrystal Al-Pd- Mn. Quasicrystals have unique properties in their own structure. In the surface structure general...In this paper, we are going to study the surface structure and existing symmetry by simulation of a quasicrystal Al-Pd- Mn. Quasicrystals have unique properties in their own structure. In the surface structure generally we should pay attention to two subjects. Firstly, what kind of atoms have situated on the surface and secondly the form of collecting atoms by each other sides. Usually, there are different ways for answer to these questions. In this study, Low Energy Ion Scattering (LEIS) technique has been applied. We select a representative cell by using gained information from Low Energy Electron Diffraction (LEED) technique, and give the information to the SABRE computer program. This computer program has been run for azimuthally angles 0 - 180 degrees in the intervals of 9 degree and its output has been analyzed for gaining azimuthally scan. The azimuthally scan shows the existing of a symmetry 72 degree on the surface of this quasicrystal.展开更多
目的：对白骨壤果实中微量元素进行测定分析。方法：采用微波消解-电感耦合等离子体发射光谱法（微波消解-ICP-OES法）测定白骨壤果实中Zn、Ni、Fe、Mg、Mn、Cr、Al、V、Cd、As、Cu、Pb、Ba、B共14种微量元素含量。使用电感耦合等离子...目的：对白骨壤果实中微量元素进行测定分析。方法：采用微波消解-电感耦合等离子体发射光谱法（微波消解-ICP-OES法）测定白骨壤果实中Zn、Ni、Fe、Mg、Mn、Cr、Al、V、Cd、As、Cu、Pb、Ba、B共14种微量元素含量。使用电感耦合等离子体发射光谱仪,发射功率1.2 k W,等离子气流量15 L·min^-1,辅助气流量1.5 L·min^-1,雾化气压200 k Pa,泵速15 r·min^-1,进样延迟时间为30 s。结果：白骨壤果实中含有丰富的微量元素Mg、Al、Fe、Mn等,而Cd和As含量极低或未检出。精密度试验的RSD为0.8%-3.6%,加标回收率为96.2%-102.4%。结论：建立的微波消解-ICP-OES分析方法可测定白骨壤果实中多种微量元素,同时为测定其他药材中微量元素的测定提供参考和理论依据。展开更多
目的通过电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)法建立加味左金丸中Cd、Pb、As、Hg、Co、V、Ni、Cu、Li、Sb、Ba、Mo、Sn、Cr、Na、Mg、Al、Ca、Ti、Mn、Fe、Zn、Ga、Se、Sr、Tl共计26种无机元素...目的通过电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)法建立加味左金丸中Cd、Pb、As、Hg、Co、V、Ni、Cu、Li、Sb、Ba、Mo、Sn、Cr、Na、Mg、Al、Ca、Ti、Mn、Fe、Zn、Ga、Se、Sr、Tl共计26种无机元素的测定方法。方法加味左金丸通过微波消解法处理后,根据相对分子质量的大小选择内标物,其中^(7)Li、^(23)Na、^(24)Mg、^(27)Al、^(40)Ca、^(48)Ti、^(51)V、^(52)Cr、^(55)Mn、^(56)Fe、^(58)Ni、^(59)Co、^(63)Cu、^(66)Zn、^(70)Ga、^(75)As、^(77)Se、^(86)Sr以^(72)Ge作为内标;^(95)Mo、^(114)Cd、^(118)Sn、^(121)Sb、^(137)Ba以^(115)In作为内标;^(202)Hg、^(205)Tl、^(208)Pb以^(209)Bi作为内标。对标准品溶液、空白溶液与供试品溶液进行分析,采用标准曲线法进行定量分析。通过ICP-MS法进行测定。结果26种无机元素线性的相关系数r≥0.9996,检出限为0.001~1.500μg/L,定量限为0.01~5.00μg/L,精密度与重复性试验的RSD均小于5%,平均回收率在82.64%~106.44%,RSD均小于5%。对3个厂家的12批样品进行了测定,26种元素的含量差异较大,其中Na、Mg、Ca、Fe 4种元素的含量比较高,均大于500μg/g,Cd、Pb、As、Hg、Co、Li、Sb、Mo、Sn、Cr、Se、Tl的含量比较低,均小于1μg/g。由结果可知,人体的常量元素,如Na、Mg、Ca的含量比较高,Cd、Pb、As、Hg等有害元素含量比较低。根据《中国药典》2020年版一部的要求,本品中Cd、Pb、As、Hg与Cu均符合规定。结论该方法快速、准确,可以用于加味左金丸中无机元素的测定。展开更多
目的建立微波消解-电感耦合等离子体质谱（ICP-MS）直接稀释测定脉络宁注射液中25种矿物质元素（Mg、Ca、Fe、Cu、Zn、Mn、Al、B、Ba、Co、Cr、K、Li、Mo、Na、Ni、P、Pb、Sr、Th、Ti、V、As、Cd和Hg）的方法。方法分别对微波消解条件...目的建立微波消解-电感耦合等离子体质谱（ICP-MS）直接稀释测定脉络宁注射液中25种矿物质元素（Mg、Ca、Fe、Cu、Zn、Mn、Al、B、Ba、Co、Cr、K、Li、Mo、Na、Ni、P、Pb、Sr、Th、Ti、V、As、Cd和Hg）的方法。方法分别对微波消解条件和测试条件进行考察;样品经微波消解后,采用电感耦合质谱仪测定25种矿物质元素,并对测定方法学进行考察。结果确定最佳消解条件为3步缓慢升温：400 W 80℃升温10 min,保留5 min;600 W 120℃升温10 min,保留5 min;900 W 200℃升温20 min,保留20 min;25种矿物质元素在各自的线性范围内线性关系良好,r≥0.999 6,精密度、稳定性和重复性试验的RSD均符合定量分析要求;加标回收率为94.7%~106.1%,RSD在0.34%~2.79%。脉络宁注射液中检测出Mg、Ca、Fe、Cu、Zn、Mn、Al、B、Ba、Co、Cr、K、Li、Mo、Na、Ni、P、Pb、Sr、Th、Ti、V,未检出As、Cd和Hg。结论该方法简便、迅速、准确,适用于脉络宁注射液中25种矿物质元素的同时测定。展开更多
基金The National Natural Science Foundation of China （No. 20476032）Natural Science Foundation of Guangdong Province （No. 030951） are gratefully acknowledged for financial support for this project.
文摘Abstract： Mn/Ba/Al2O3 catalyst for NO oxidation-storage and Pt/Ba/Al2O3 catalyst mixed with Mn/Ba/Al2O3 for NOx storage-reduction by hydrogen were investigated. The results showed that Mn/Ba/Al2O3 had large nitrogen oxides storage capacity （397.9 μmolg^-1） under lean burn condition. When Pt/Ba/Al2O3 catalyst was mixed with Mn/Ba/Al2O3 in equal weight proportion, the NOx conversion increased between 250 ℃ and 500 ℃ under the dynamic lean-rich burn conditions, and the maximum NOx conversion increased from 95.4% to 98.2%. Mn/Ba/Al2O3 has promoted NOx storing in the lean stage and improved NOx reduction efficiency in the rich stage, these might result in higher NOx conversion over the low Pt loading content catalyst.
文摘In this paper, we are going to study the surface structure and existing symmetry by simulation of a quasicrystal Al-Pd- Mn. Quasicrystals have unique properties in their own structure. In the surface structure generally we should pay attention to two subjects. Firstly, what kind of atoms have situated on the surface and secondly the form of collecting atoms by each other sides. Usually, there are different ways for answer to these questions. In this study, Low Energy Ion Scattering (LEIS) technique has been applied. We select a representative cell by using gained information from Low Energy Electron Diffraction (LEED) technique, and give the information to the SABRE computer program. This computer program has been run for azimuthally angles 0 - 180 degrees in the intervals of 9 degree and its output has been analyzed for gaining azimuthally scan. The azimuthally scan shows the existing of a symmetry 72 degree on the surface of this quasicrystal.
文摘目的：对白骨壤果实中微量元素进行测定分析。方法：采用微波消解-电感耦合等离子体发射光谱法（微波消解-ICP-OES法）测定白骨壤果实中Zn、Ni、Fe、Mg、Mn、Cr、Al、V、Cd、As、Cu、Pb、Ba、B共14种微量元素含量。使用电感耦合等离子体发射光谱仪,发射功率1.2 k W,等离子气流量15 L·min^-1,辅助气流量1.5 L·min^-1,雾化气压200 k Pa,泵速15 r·min^-1,进样延迟时间为30 s。结果：白骨壤果实中含有丰富的微量元素Mg、Al、Fe、Mn等,而Cd和As含量极低或未检出。精密度试验的RSD为0.8%-3.6%,加标回收率为96.2%-102.4%。结论：建立的微波消解-ICP-OES分析方法可测定白骨壤果实中多种微量元素,同时为测定其他药材中微量元素的测定提供参考和理论依据。
文摘目的建立微波消解-电感耦合等离子体质谱（ICP-MS）直接稀释测定脉络宁注射液中25种矿物质元素（Mg、Ca、Fe、Cu、Zn、Mn、Al、B、Ba、Co、Cr、K、Li、Mo、Na、Ni、P、Pb、Sr、Th、Ti、V、As、Cd和Hg）的方法。方法分别对微波消解条件和测试条件进行考察;样品经微波消解后,采用电感耦合质谱仪测定25种矿物质元素,并对测定方法学进行考察。结果确定最佳消解条件为3步缓慢升温：400 W 80℃升温10 min,保留5 min;600 W 120℃升温10 min,保留5 min;900 W 200℃升温20 min,保留20 min;25种矿物质元素在各自的线性范围内线性关系良好,r≥0.999 6,精密度、稳定性和重复性试验的RSD均符合定量分析要求;加标回收率为94.7%~106.1%,RSD在0.34%~2.79%。脉络宁注射液中检测出Mg、Ca、Fe、Cu、Zn、Mn、Al、B、Ba、Co、Cr、K、Li、Mo、Na、Ni、P、Pb、Sr、Th、Ti、V,未检出As、Cd和Hg。结论该方法简便、迅速、准确,适用于脉络宁注射液中25种矿物质元素的同时测定。
