共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
经HNO3/H2O2湿法微波消解制样,利用全谱直读电感耦合等离子原子发射光谱法(ICP-OES),测定了青藏高原地区产肉苁蓉中的矿质元素。结果显示,肉苁蓉中含有Na、K、Ca、P、S、Mg、Si、Al、Fe、Li、Ti、Sr、Mn、Zn、Cu、Ba、B、Cr等18种矿质元素。测定结果相对标准偏差RSD值在0.85%~12.6%,其中14种在5%以内。常量元素中,Na、K、Ca、P、S、Mg的质量分数分别为4.03%,1.23%,0.31%,0.32%,0.29%,0.17%;微量元素中,Fe、Mn、Zn、Cu、Cr含量分别为788.3,16.87,15.29,7.18,1.24 mg/kg。 相似文献
3.
针对高含硅污水进行不同程度软化后回用注汽锅炉出现的炉管结垢问题进行实验研究。整个中试实验现场运行300天,利用国家标准、行业标准及ICP-AES等对2种不同的软化水质中的主要指标及结垢性金属元素进行测定。发现普通软化(PR)和深度软化(SR)水质中结垢性金属元素总量分别为0.101 mg/L和0.020 mg/L。通过SEM/EDS、XRD对2种垢质进行了元素及化合物分析,发现PR水质形成的垢质主要元素组成为C、O、Ca、Mg、Fe、Si、Na,主要化合物为Ca Si O3、Ca CO3和Si O2等;SR水质形成的垢质主要元素组成为C、O、Fe、Si、Na,主要化合物为Fe3O4、Na Fe Si2O6和Si O2等。最后,结合水质及垢质的分析得出,随着软化程度的加深,腐蚀产物为炉管垢质的主要成分,控制炉管腐蚀能极大的控制垢量。 相似文献
4.
微波消解-ICP-OES法测定黑芝麻中的18种矿质元素 总被引:1,自引:0,他引:1
采用HNO3/H2O2湿法微波消解制样,利用全谱直读电感耦合等离子原子发射光谱法(ICP-OES),全面详细地分析测定了黑芝麻中的矿质元素,共检出Ca、P、S、Mg、K、Al、Si、Fe、Na、Zn、Se、Sr、Cu、Mn、Ba、B、Ti、Cr等18种矿质元素,RSD值在1.21%~10.1%,其中13种元素在5%以内。黑芝麻中所含人体常量元素Ca、P、S、Mg、K、Na等的质量分数分别为1.79%,1.08%,0.59%,0.43%,0.41%和0.009 1%;微量元素Fe、Zn、Se、Cu、Mn、B、Cr、Sr、Si、Al等的含量分别为18.6,4.55,3.87,1.74,1.62,0.91,3.21,78.8,125.8 mg/100 g,未检出Pb、Hg、Cd、As以及Ni、Co、Mo等元素。 相似文献
5.
6.
全谱直读电感耦合等离子体原子发射光谱测定苦荞麦矿物元素 总被引:1,自引:0,他引:1
采用HNO3/H2O2湿法微波消解制样,采用全谱直读电感耦合等离子体原子发射光谱法(ICP-OES),分析测定了苦荞麦中的矿物元素,共检出P、S、K、Mg、Ca、Si、Al、Fe、Na、Zn、Mn、B、Cu、Se、Ti、Cr、Ba、Sr等18种矿物元素。分析结果的RSD值在0.45%~9.09%之间,其中15种元素在5%以内。苦荞麦中所含P、S、K、Mg、Ca、Na等常量元素的质量分数分别为0.21%、0.21%、0.17%、0.098%、0.019%、0.0017%;微量元素Fe、Zn、Cu、Se、Cr、Si、Mn、B、Ti、Ba、Sr、Al等的含量(mg.kg-1)分别为37.4、16.5、3.67、1.38、0.44、121.6、6.90、4.88、0.63、0.22、0.12、49.9。 相似文献
7.
采用全谱直读电感耦合等离子体原子发射光谱法(ICP-OES)对绞股蓝茶的微波消解液及浸出液中的矿物元素进行了测定分析,实验发现:微波消解液中检出K、P、S、Na、Al、Fe、Mg、Si、Ca、Cd、B、Cu、Zn、Pb、Ba、Ti、Sr、Mn、V、Cr等20种矿物元素,分析结果的相对标准偏差在0.24%~10.4%之间;浸出液中检出K、Ca、S、Na、Mg、Si、Al、P、Mn、B、Sr、V、Cu等13种矿物元素,分析结果的相对标准偏差在0.44%~6.33%之间。实验结果可为深入研究绞股蓝茶提供基础数据。 相似文献
8.
利用废碎建筑玻璃制微晶玻璃,探讨不同含量的Na2SiF6晶核剂对微晶玻璃结构及性能的影响.用×RD和SEM及相关分析软件表征不同样品的晶相及微观形貌并测试试样的相关性能指标.实验结果表明:添加Na2SiF6晶核剂试样中形成三种晶相:Na2Ca3Si6O16、SiO2、Ca4F2Si2O7,其中Na2Ca3Si6O16和SiO2为主晶相,Na2SiF6晶核剂能够促进玻璃析晶.确定Na2SiF6最佳添加量为8%.对应的晶相(Na2Ca3Si6O16、SiO2、Ca4F2Si2O7)含量为54.56%,抗折强度为141.1 5MPa,体积密度为2.423g/cm3,吸水率为0.025%. 相似文献
9.
粉煤灰形貌元素组成的SEM/EDS分析 总被引:1,自引:0,他引:1
文章用扫描电子显微镜/能量色散谱(SEM/EDS)的扫描电镜、元素组成分析功能和背散射找寻功能对粉煤灰进行了形貌、元素组成分桥。粉煤灰为富含SiO2、Al2O3的比较规则的球形玻璃微珠(SiO2和Al2O3的含量达57.64%和31.09%),元素组成为Si、Al、O、Fe、Cu、Zn、Mg、Ca、Ti、K、Na、Ba等,无其它对人体有重大影响的重金属离子,对环境友好。粉煤灰颗粒中也有极少柱状、条状、纤维状、扁平状的颗粒,其组成大部分与球形颗粒相差不大,但也存在几乎哭含有氧化硅或氧化铁豹颗粒。粉煤灰颗粒是各种氧化物的聚集体。 相似文献
10.
11.
12.
The transport properties of ionic liquids (ILs) are crucial properties in view of their applications in electrochem-ical devices. One of the most important advantages of ILs is that their chemical–physical properties and conse-quently their bulk performances can be well tuned by optimizing the chemical structures of their ions. This will require elucidating the structural features of the ions that fundamentally determine the characteristics of the nanostructures and the viscosities of ILs. Here we showed for the first time that the“rigidity”, the order, and the compactness of the three-dimensional ionic networks generated by the anions and the cation head groups determine the formation and the sizes of the nanostructures in the apolar domains of ILs. We also found that the properties of ionic networks are governed by the conformational flexibility and the symmetry of the anion and/or the cation head group. The thermal stability of the nanostructures of ILs was shown to be con-trolled by the sensitivity of the conformational equilibrium of the anion to the change of temperature. We showed that the viscosity of ILs is strongly related to the symmetry and the flexibility of the constitute ions rather than to the size of the nanostructures of ILs. Therefore, the characteristics of the nanostructures and the viscosities of ILs, especially the thermal stability of the nanostructures, can be fine-tuned by tailoring the symmetry and the conformational flexibility of the anion. 相似文献
13.
14.
Investigation of the effects of fatty acids on the compressive strength of the concrete and the grindability of the cement 总被引:1,自引:0,他引:1
In cement industry, a great energy consumption has been observed during grinding of clinker. To reduce this consumption, some waste products have been used as grinding aids.In this investigation, the effects of sunflower oil (SO), oleic acid (OA), stearic acid (SA), myristic acid (MA) and lauric acid (LA) on the fineness and strength of the cement have been examined. These aids were added into clinker in certain ratios based on the cement clinker weight and the grinding has been done for a definite time at the same condition.All of the fatty acids used increased the fineness as compared with the cement without the grinding additives. SO and OA decreased the strength significantly, LA decreased it to a lesser extent and SA increased it definitely according to the common cement. But MA did not alter the strength of the cement as much as SA. In addition, the covering of the balls influences the grinding of cement clinker unfavourably. 相似文献
15.
16.
17.
18.
19.
20.
组合凹模的应力分析是一个非常复杂的问题,对其进行精确分析是解决模具寿命的关键。本文采用有限元分析软件Ansys对转子的组合凹模进行了分析,为转子组合凹模的优化设计提供了依据。 相似文献