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为了禁止含砷、汞、铅物质应用到烟花爆竹药物中,建立ICP-AES方法,在烟花爆竹药物经乙醇、丙酮及硝酸处理后,选用As 189.042 nm、Hg 194.227 nm、Pb 220.353 nm分析线同时测定这3种元素的含量,结果:相对标准偏差为1.97%~2.71%,回收率为98.5%~101%.方法操作简单快速,检出限低、干扰小,结果准确可靠. 相似文献
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Pt/TiO2上苯和乙烯光催化氧化过程的磁场效应 总被引:1,自引:0,他引:1
以Pt/TiO2为催化剂和365 nm紫外光为光源, 在低于0.2 T的磁场强度范围考察了磁场对苯和乙烯光催化氧化反应的影响. 实验发现, 当用紫外灯管作光源并靠近磁场磁极或者置于磁场磁极间隙内照射反应器时, 磁场可显著提高气相苯和乙烯的光催化转化率和矿化率; 而当光源远离磁场磁极而通过光导纤维传导照射到反应器上时, 磁场对这两个反应没有促进作用. 在前一种情况下, 紫外灯管的发光强度随磁场的增强而提高, 磁场对这两个光催化降解反应的促进作用被证实是由于磁场提高了紫外灯管的发光强度, 进而为反应提供了更多的光能和使反应温度升高所致;在后一种光照方式下, 由于光源不受磁场影响, 磁场对这两个光催化反应不产生影响. 这一研究结果表明, 在所研究磁场强度范围, 磁场对气-固相光催化反应没有任何本征影响. 相似文献
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Stable water droplets on composite structures formed by embedded water into fully hydroxylated β-cristobalite silica 下载免费PDF全文
Using molecular dynamics simulations, we have revealed a novel wetting phenomenon with a droplet on composite structures formed by embedded water into(111) surface of β-cristobalite hydroxylated silica. This can be attributed to the formation of a composite structure composed of embedded water molecules and the surface hydroxyl(–OH) groups,which reduces the number of hydrogen bonds between the composite structure and the water droplet above the composite structure. Interestingly, a small uniform strain(±3%) applied to the crystal lattice of the hydroxylated silica surface can result in a notable change of the contact angles(> 40°) on the surface. The finding provides new insights into the correlation between the molecular-scale interfacial water structures and the macroscopic wettability of the hydroxylated silica surface. 相似文献
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