您的位置: 首页 > 国外标准 > 美国国家ANSI >  ANSI/ASTM D4739-2007  用电势滴定法测定碱值的试验方法
 

ANSI/ASTM D4739-2007  用电势滴定法测定碱值的试验方法

标准编号:ANSI/ASTM D4739-2007
分享到:

中文标准名称:用电势滴定法测定碱值的试验方法
英文标准名称:Test Method for Base Number Determination by Potentiometric Titration
语言:英文版,中文版
发布日期:2007
实施日期:2007-12-25
标准类别:美国国家ANSI
中国标准文献分类法(中标分类CCS):化工 >> 化工综合 >> 基础标准与通用方法
中国标准文献分类法(中标分类CCS):化工技术 >> 分析化学 >> 化学分析
标准简介:This test method covers a procedure for the determination of basic constituents in petroleum products and new and used lubricants. This test method resolves these constituents into groups having weak-base and strong-base ionization properties, provided the dissociation constants of the more strongly basic compounds are at least 1000 times than that of the next weaker groups. This test method covers base numbers up to 250. In new and used lubricants, the constituents that can be considered to have basic properties are primarily organic and inorganic bases, including amino compounds. This test method uses hydrochloric acid as the titrant, whereas Test Method D 2896 uses perchloric acid as the titrant. This test method may or may not titrate these weak bases and, if so, it will titrate them to a lesser degree of completion; some additives such as inhibitors or detergents may show basic characteristics. When testing used engine lubricants, it should be recognized that certain weak bases are the result of the service rather than having been built into the oil. This test method can be used to indicate relative changes that occur in oil during use under oxidizing or other service conditions regardless of the color or other properties of the resulting oil. The values obtained, however, are intended to be compared with the other values obtained by this test method only; base numbers obtained by this test method are not intended to be equal to values by other test methods. Although the analysis is made under closely specified conditions, this test method is not intended to, and does not, result in reported basic properties that can be used under all service conditions to predict performance of an oil; for example, no overall relationship is known between bearing corrosion or the control of corrosive wear in the engine and base number. This test method was developed as an alternative for the former base number portion of Test Method D 664 (last published in Test Method D 664-81). 1.4.1 Colorimetric test methods for base number are Test Method D 974, IP 139, and 5102.1 on acid and base number by extraction (color-indicator titration) of Federal Test Method Standard No. 791b. Test results by these methods may or may not be numerically equivalent to this test method. The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
文件格式:纸质版或者PDF电子版(用Acrobat Reader打开)或Word版本doc格式
PDF格式 ANSI/ASTM D4739-2007 用电势滴定法测定碱值的试验方法 免费下载 Word格式 ANSI/ASTM D4739-2007 用电势滴定法测定碱值的试验方法 免费下载免费标准下载
文件大小:462 KB
添加时间:2013/04/16
 
相关免费标准
 
 
本类标准下载排行
 
 
本类最新免费标准
 
免费标准下载网 |标准分享网 |联系我们
版权所有:www.ZBGB.org