流动注射—超声雾化器—电感耦合等离子体原子发射光谱(FI-ICP/AES)联用技术同时测定头发中多种元素

建立了 FI-UN-ICP/AES 联用技术,用所发展技术进行了头发中多种微量元素的同时测定。与常规气动雾化器 ICP/AES 技术相比,尽管是用流动注射方法引入样品,测定的检出限仍有较大改进(2—23倍)。多次注射测定的再现性(RSD)在0.6—5.0%范围内。同时进行了标准加入回收试验,获得了很好的结果(90—110%)。     

电感耦合等离子体发射光谱的光谱仪

<正> The spectrometer is a very important integrant of an ICP-AES system. In this talk, the general architecture and requirements of the spectrometer for ICP-AES, the grating, the simultaneous multichannel and sequential spectrometers, etc., will be reviewed.     

自动车床凸轮CAD／CAM

介绍一种自动车床凸轮的CAD／CAM方法，通过简单的输入即可得到标准的调整卡和凸轮线切割程序清单，一次性完成全部工艺准备工作。     

马铃薯的食品营养价值及其方便食品

一.马铃薯的营养价值马铃薯一名土豆,也有叫做洋山芋与地蛋的。它属于茄科植物,可食的是它在地下的块茎部分。新鲜马铃薯约含水分76%,蛋白质2%,碳水化合物21%,纤维与灰分1%。新鲜马铃薯的蛋白质虽只有2%,但是如果把它干燥到含有一般白米那样13%水分,那末这样的马铃     

新的天然甜味剂——甜叶菊甙研究的进展

甜叶菊甙一名斯替维甙,它是称做甜叶菊的一种植物(Stevia rebaudinan Bertoni)中含有的天然化学成分。这种植物原生地在南美巴拉圭、巴西等国家,它的叶和茎具有极强的甜味,当地人民将这种植物的野生种用为甜味料已有多年的历史。本世纪初期,甜叶菊开始引起植物学家和化学家的注意。但在四十年代以前关于甜味菊的甜味成分的研究还是不多.五十年代以后这一研究有了迅速的进展,这首先应当归功于伍德和莫赛悌(1955)二人.到了六十年代和七十年代,由于某些人工甜味剂如甜精、仙客来等发见有毒性,国际上已禁止使用,而糖精在安全问题上也有争论。在这种形势下,人们迫切希望有更安全的、无毒性的天然甜     

氢化物发生技术和ICP-AES联用的前景

<正> Hydride generation (HG)technique has been widely used for the determination of volatile hydride forming elements by atomic spectroscopy since Holak reported the determination of arsenic with this technique using atomic absorption spectrometry in 1969. The most commonly used method     

多道等离子体原子发射光谱仪控制和数据处理系统的改造

在原有硬件基础上，对Polyvac E-984型多道电感耦合等离子体原子发射光谱仪控制和数据采集系统进行的改造。通过测试，评价了改造后仪器的稳定性及检测出限。     

电感耦合等离子体——原子化、激发和电离的有用光源

<正> Inductively coupled plasma atomic emission spectroscopy (ICP-AES), pioneered by V A Fassel and S Greenfield with the inspiration from Reed, is one of the most exciting developments in analytical instrumentation since 1960' s . It can determine about 70 elements on the periodic table with better precision and equal or better sensitivity than that obtained with flame atomic absorption spectrometry (FAAS) . In addition, certain "difficult" elements for FAAS, such as Al, B, C, P, S and Ti, etc., can be easily determined by ICP. The ICP is not only a very useful excitatiom source for AES, but also a very useful source for atomization in atomic fluorescence spectrometry (AFS) and for ionization in atomic mass spectrometry (MS). This lecture deals     

A Study on Argon Inductively Coupled Plasma with Introduction of Ethanol SolutionⅠ.Effect of Ethanol on Line Intensity of Rare Earth Elements

Effect of ethanol on corrected intensity,i.e.the intensity corrected for the rate at which an analyte solutionenters ICP,of lines of 10 rare earth elements,Mg,Fe and Cd have been studied,Compared to the aqueous case,the introduction of an ethanol solution results in a decrease in corrected intensity.For all the ionic lines and theatomic lines of Cd,the corrected intensities decrease steadily with increasing ethanol concentration from 0 to95 vol%.while for the atomic lines of the other elements,the corrected intensities have minima at certainethanol concentration.For a given element,the higher the excitation energy of a line,the greater the decrease inthe corrected intensity with the introduction of ethanol,The depression of corrected intensity by ethanol islinearly related to excitation energy.The above results have been used for identifying the ionization states of 38lines of rare earth elements and estimating their excitation energies.     

正交递归选择法及其在转炉炉龄研究中的应用

本文提出了一种新的变量筛选法—正交递归选择法,该法可以得到预报能力较强的模型,即PRESS(预报残差平方和)值较低的模型。转炉炉龄问题作为研究实例,并与逐步回归正向选择法及偏最小二乘回归法进行了比较。