ISO-787-19-1974.pdf
《ISO-787-19-1974.pdf》由会员分享,可在线阅读,更多相关《ISO-787-19-1974.pdf(5页珍藏版)》请在三一文库上搜索。
1、INTERNATIONAL STANDARD 787/X1X INTERNATIONAL ORGANIZATION FOR STANDARDIZATION .MEXLWHAPOflHAR OPrAHH3AUMR IlO CTAHAAPTA3AUCIH.ORGANlSATlON NTERNATIONALE DE NORMALISATION General methods of test for pigments - Part XIX Me thodes g take care to avoid losses by splashing. Cool and add sodium hydroxide
2、solution (4.6) until just alkaline. Cool again and adjust the pH to 8.0 -f 0.5 measured by the pH meter Filter through filter paper and wash with hot water, collecting the filtrate and washings in a 250 ml one-mark volumetric flask Cool, make up the mark and mix 8.2 Pipette 10 ml of this solution to
3、 a 100 ml glass beaker. NOTE - If the nitrate content is found to be greater than 0.1 %, carry out a second determination, using 5 ml of solution. 8.3 Add to the beaker 1 ml of sodium salicylate solution (4.4) and proceed as specified in clause 7, including the determination of the absorbance at 410
- 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 787 19 1974
链接地址:https://www.31doc.com/p-3779303.html