The Separation of Beryllium from Selected Elements Using the Dipex® Extraction Chromatographic Resin

Abstract

An extraction chromatographic resin containing the acidic chelating organophosphorus extractant, Dipex^®, sorbed onto an inert polymeric substrate has been evaluated for the separation of beryllium from a wide range of elements. The elements selected comprise those which can interfere with the determination of beryllium by inductively coupled plasma‐atomic emission spectroscopy (ICP‐AES) and matrix elements which commonly occur in environmental and industrial samples. Based on batch uptake measurements, a method that separates beryllium from all potential ICP‐AES spectral interfering elements using a single extraction chromatographic column is outlined. The chromatographic parameters of the separation method have been optimized using simulated samples generated using the digestion process employed in beryllium analyses by the Y‐12 National Security Complex and simulated ground water samples.     

食品添加剂盐酸的安全生产与质量控制要点

介绍了食品添加剂盐酸的生产工艺、安全控制要点、贮运环境要求及使用ICP发射光谱法测定其中的砷、铅含量的注意事项.     

Self-aligned fabrication of single crystal diamond gated field emitter array

This paper describes a self-aligned fabrication process for diamond gated field emitter array (FEA). Utilizing the non-conformal coverage sputtering conditions of silicon oxide, an interesting “sphere on cone” structure is formed on diamond nano tip array, which is the key point of gate hole opening process. This structure causes shadowing at certain regions of side-wall during Ti / Au gate metal deposition. Removal of “sphere” by wet etching leads to the successful fabrication of a single crystalline diamond gated FEA. Scanning electron microscope observations reveal the fabrication of a uniform emitter array with tip radius of curvature (20 nm) and gate hole (1.4 μm). We also confirmed that no noticeable physical damage exists on tip. In field emission characteristics of the fabricated single crystal diamond gated FEA, gate voltage control of field emission current is realized.     

Run-to-run control of inductively coupled C2F6 plasma etching of SiO2: Construction of a numerical process with a computational fluid dynamics code

A numerical process to simulate SiO₂ dry etching with inductively coupled C₂F₆ plasmas has been constructed using a commercial CFD code as a first step to design a run-to-run control system. The simulator was found to reasonably predict the reactive ion etching behavior of C₂F₆ plasmas and used to investigate the effects of plasma operating variables on the etch rate and uniformity. The relationship between the operating variables and the etching characteristics was mathematically modeled through linear regression for future run-to-run control system design.     

电感耦合等离子发射光谱法测定对苯二甲酸中金属元素

研究了使用氨水溶解样品、电感耦合等离子发射光谱仪（ICP）测定精对苯二甲酸（PTA）中微量金属元素含量的方法。与常规的灰化法处理样品相比,该方法简单、快速、环保,对PTA中常见金属元素的回收率在96％～103％之间,适用于PTA产品和生产过程控制分析。     

应用电感耦合等离子发射光谱仪监测使用中润滑油的元素含量

本文介绍用电感耦合等离子发射光谱仪(ICPAES)测定润滑油中的元素含量,对润滑油的使用监测具有快速而准确的特点。     

Enhancement effect of organic solvents on the line intensity of lower power argon ICP-AES：Part I On the nebulization procedure

The procedure of nebulization was studied with the introduction of ethanol into a lower power argon ICE It was found that as ethanol introduced, the physical properties of solutions changed, which results in an improvement on the nebulization efficiency. An empirical relationship between the concentration of the aerosol and the solution properties ( viscosity, density, and surface tension) is presented.     

等离子发射光谱法测定钡铁中的铜,硅,铝,磷,铬,镍,钨,锰

叙述采用等子发射光谱法同时测定钡铁中的铜、硅、铝、磷、铬、镍、钨、锰等微量元素,试样用稀王水分解,选择适当的波长与背景校正进行分析测定,方法回收率在９５％～１０５％之间,相对标准偏差均小于４％,本方法快速准确,精密度良好。     

Relationships between minerals in Australian brown rice

Ninety samples of brown rice cv Amaroo, which has occupied over 50% of the area sown to rice in southern Australia in the last two seasons, were collected from the rice growing regions of southern Australia at the end of the 1991–1992 season. The samples were analysed for total nitrogen using the Kjeldahl technique, and for P, K, S, Mg, Ca, Na, Al, Cu, Fe, Mn, Mo and Zn using inductively coupled plasma emission spectroscopy. The analysis of concentrations of elements show that Mn concentrations in Australian rice were higher and Ca concentrations lower than typical values reported for brown rice grown in other countries. For all other elements the concentrations had a similar range to those reported for overseas rice. Highly significant correlations were found between the major nutrients P, K and Mg, and also N and S. The Mg to K ratio ranged from 1·3 to 1·6 which indicates that, if Japanese criteria are used, the taste/stickiness quality within this cultivar of Australian rice could vary from undesirable to highly desirable.     

铂、钯材料ICP分析方法的研究

由于铂、钯材料被广泛应用于多种精密行业,其材料含量也越来越受到重视,目前采用的方法不是操作复杂就是范围太窄而不符合日常检测要求,因此急需建立一种简捷快速的、适用于铂、钯材料含量为95．0％-99．99％的化学分析方法。该文用电感耦合等离子发射光谱分析,测定铂、钯材料中铂（钯）、铑、铱、钌、金、银、铜、铁、镍、铝、铅、锰、铬、镁、锡、硅、锌及铋等杂质元素的方法,达到了检出限低、重复性好、回收率在88．3％-100％的检测目标。