示波极谱滴定法测定工业氯化钙主要成份

在氯化铵-氨水(pH=11)支持电解质中用微银汞膜电极进行试验,锰、铁不干扰测定,用EDTA滴定氯化钙获得令人满意的结果。对三种样品进行分析,变异系数为0.08％—0.11％。该法快速准确,适用于氯化钙主要成份的测定。     

山东全面禁止使用实心黏土砖

根据日前出台的《山东省新型墙体材料发展应用与建筑节能管理规定》，从今年11月1日起。山东省设市城市规划区范围内全面禁止使用实心黏土砖，并逐步采用利用工业废渣生产的轻质、高强、保温性能好的新型墙体材料。     

消化磷废渣生产线在宁夏投产

近日国内第一条年产20万t、利用工业磷石膏废渣生产磷石膏建材制品的生产线在鲁西化工集团宁夏化肥公司建成投产。其采用“闪烧法生产技术”生产的建筑石膏粉已通过国家质检。     

A study of arc stability of basic electrode in view of uniform design method

In order to develop a basic electrode with low fume and good usability, a uew slag system has been designed after analyzing several basic electrode slag systems. Then in view of uniform design method, arranging the experiment points by it, the influenced laws of the uew system coating compouents on the arc stability had been searched. In the formula, niue coating compouents were taken as independent variables and they were divided into six levels in all twenty-four experiments. The arc stability was taken as function and taken down the data when welding and then put them into the computer to be processed statistically. The analysis results give the mathematical model and trend diagrams between independent variables and the function. They indicate that the effects of many coating compouents on the arc stability are in the mutual form. The mutual effects between CaCO3 and BaF2, BaF2 and BaCO3 , increases the arc stability separately. While the mutual effects between CaF2 and iron powder, the square item of iron powder itself decreases the arc stability separately.     

离子选择性电极法和电位溶出分析法在食品检测中的作用

本文重点概述离子选择电极和电位溶出分析法在食品检测中的作用。离子选择电极部分主要介绍氟电极、氯电极、硝酸根电极、铅电极、氨电极、糖精电极在食品中的应用情况。电位溶出分析法部分论述八十年代以来几种主要的电位溶出分析技术:常规电位溶出法、微分电位溶出法、流动电位溶出法、计时电位溶出法、流动注射电位溶出法对食品和饮料中有害元素的监测方面所起到的作用。     

电弧炉电极升降工业控制微机抗干扰的应用

1993年以来 ,长城特殊钢公司第四钢厂炼钢分厂相继在 4台 30t电炉上成功改造应用了电极升降调节用工业微机。该 8位微型计算机系统由CPU模板、接口板、输入板、输出板、开关电源 ,显示板的微机柜和信号变送器、开关指令元件、隔离变压器、稳压电源的分立元件柜组成。在实际运行     

测定饲料中微量氟的新方法

样品灰化后,在弱酸性介质中,用氟离子选择性电极、已知量添加法测定饲料中微量氟.该方法标准偏差为7 ×10-5%,变异系数＜9%,回收率在95.4%～103.0%.方法简便、数据准确.