ASTM D5974-2000(2005)
用毛细管气相色谱法测定妥尔油分级分离产品中脂肪和树脂酸的标准试验方法
Standard Test Methods for Fatty and Rosin Acids in Tall Oil Fractionation Products by Capillary Gas Chromatography
ASTM D5974-2000(2005) 中，可能用到以下试剂
- 标准号
- ASTM D5974-2000(2005)
- 发布日期
- 2000年
- 实施日期
- 废止日期
- 无
- 中国标准分类号
- G16
- 国际标准分类号
- 67.080.10 (Fruits and derived products); 67.200.10
- 发布单位
- US-ASTM
- 适用范围
1.1 These test methods cover the determination of the amounts of the individual fatty acids and rosin acids in fractionated tall oil products, using capillary gas chromatographic separation of the volatile methyl esters of these acids.
1.2 Four methods for forming the methyl esters, and two methods for determining the amounts of the individual fatty acids and rosin acids are described.
1.2.1 The classic method for the formation of methyl esters is through the use of diazomethane, but diazomethane is a hazardous and toxic material, and so is no longer the preferred reagent. The use of diazomethane is detailed in the Appendix. Methyl esters may be formed through the use of tetramethylammonium hydroxide (TMAH), trimethylphenylammonium hydroxide (TMPAH), or N,N-dimethylformamide dimethyl acetal (DMF-DMA).
1.2.2 The two methods for determining the amount of the individual fatty acids and rosin acids are the "internal standard" method, which yields absolute values, and the "area percent" method, which yields relative values.
1.3 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.