ISO-1444-1996.pdf
《ISO-1444-1996.pdf》由会员分享,可在线阅读,更多相关《ISO-1444-1996.pdf(8页珍藏版)》请在三一文库上搜索。
1、INTERNATIONAL STANDARD Second edition 1996-04-o 1 Meat and meat products - Determination of free fat content Viandes et produits a base de viande - D the amount of solvent shall be at least one and a half to two times the capacity of the extraction tube of the apparatus. Fit the flask to the extract
2、ion apparatus. Heat the flask for at least 6 h on the sand bath or water bath (6.5), according to the extraction rate and the apparatus used. When a Soxtec or other similar automatic procedure is used, the heating period shall be at least 2 h. After extraction, take the flask containing the liquid f
3、rom the extraction apparatus and distil off the solvent using, for example, the sand bath or water bath. Evap- orate the last traces of solvent using air blowing if desired. Dry the flask for 1 h in the oven (6.6) set at 103 OC and, after allowing it to cool to room temperature in the desiccator (6.
4、7), weigh to the nearest 0,001 g. Re- peat the operations of heating, cooling and weighing until the results of two successive weighings, separ- ated by 1 h of heating, do not differ by more than 0,l % of the mass of the test portion (m*). Verify completion of the extraction by taking a second extra
5、ction flask and extracting for a further period of 1 h with a fresh portion of the solvent. The increase in mass shall not exceed 0,l % of the test portion. 10 Calculation Calculate the free fat con tent, Wf I as a percentage by mass, using the fo Ilowing equatio n: h* - ml) Wf = x100% mO 2 Copyrigh
6、t International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:04:39 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 IS0 l$44:1996(E) where 11.2 Reproducibility )vo is
7、the mass, in grams, of the test portion taken for drying; ml is the mass, in grams, of the extraction flask with boiling chips; m2 is the mass, in grams, of the flask and boiling chips with the fat, after drying. The absolute ditterence between two single test results, obtained using the same method
8、 on identical test material in different laboratories with different operators using different equipment, should not be greater than the reproducibility limit R as calculated using the following equation: R = 0,04 + 0,06wf Report the result rounded to one decimal place. where G$ is the mean of the t
9、wo test results, ex- pressed as a percentage by mass. 11 Precision The precision of the method has been established by an interlaboratory test (see reference 4), carried out in accordance with IS0 57252). For the values ob- tained for the repeatability limit, I-, and the repro- ducibility limit, R,
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 1444 1996
链接地址:https://www.31doc.com/p-3774737.html