非常抱歉，我们暂时无法提供预览，您可以试试： 免费下载 ASTM D5768-2002(2014) 前三页，或者稍后再访问。
3.1x00a0;The iodine value of a fatty acid product is a measure of the unsaturated fatty acid content of that product and consequently a measure of the ease of oxidation or drying capacity of that fatty acid product.
3.2x00a0;This test method measures the unsaturation as iodine value by addition of an iodine/chlorine reagent. The amount of reagent absorbed is determined by back titrating the excess reagent and comparing it to a blank determination.
3.3x00a0;In samples containing conjugated double bonds, the iodine value obtained is empirical since the reagent does not react stoichiometrically with conjugated unsaturation. Where no conjugation is present, the iodine value obtained is a measure of the total unsaturation. By using proper specimen weights, the empirical values obtained are useful for comparative purposes.
3.4x00a0;This test method was developed in order to replace the hazardous solvent, carbon tetrachloride, used in Test Method with the less hazardous and more available solvents, iso-octane and cyclohexane. As data on the satisfactory use of other solvents becomes available, this test method will be amended to include those solvents.
3.5x00a0;This test method should have applicability to fatty acids and oils other than tall oil fatty acid but that possibility has not been investigated.
1.1x00a0;This test method covers the Wijs procedure for determination of unsaturation (iodine value) of tall oil fatty acids.
1.2x00a0;Iodine value is a measure of the unsaturation of oils and fatty acids and is expressed in terms of the number of centigrams of iodine per gram of sample (weight percent of absorbed iodine).
1.3x00a0;When this test method is used to determine the iodine value of fatty acids having conjugated systems, the result is not a measure of total unsaturated, but rather is an empirical value that affords a comparison of unsaturation. Total unsaturation of conjugated systems may be measured in accordance with Test Method .
1.4x00a0;The test method described here is not reliable for tall oil fatty acids containing an appreciable quantity of rosin.
1.5x00a0;The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6x00a0;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.
Copyright ©2007-2016 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证：京ICP证110310号