首页 o-PHENYLPHENOL-邻-苯基苯酚

o-PHENYLPHENOL-邻-苯基苯酚

举报
开通vip

o-PHENYLPHENOL-邻-苯基苯酚 o-PHENYLPHENOL Prepared at the 8th JECFA (1964), published in NMRS 38A (1965) and in FNP 52 (1992). Metals and arsenic specifications revised at the 63rd JECFA (2004). An ADI of 0-0.2 mg/kg bw was established at the 8th JECFA (1964) SYNONYMS Orth...

o-PHENYLPHENOL-邻-苯基苯酚
o-PHENYLPHENOL Prepared at the 8th JECFA (1964), published in NMRS 38A (1965) and in FNP 52 (1992). Metals and arsenic specifications revised at the 63rd JECFA (2004). An ADI of 0-0.2 mg/kg bw was established at the 8th JECFA (1964) SYNONYMS Orthoxenol; INS No. 231 DEFINITION Chemical names (1,1'-Biphenyl)-2-ol, 2-hydroxydiphenyl, o-hydroxydiphenyl C.A.S. number 90-43-7 Chemical formula C12H10O Structural formula Formula weight 170.20 Assay Not less than 98% DESCRIPTION White, slightly yellow or pink flaky crystals or solid, having a mild characteristic odour FUNCTIONAL USES For the post-harvest treatment of fruits and vegetables to protect against microbial damage CHARACTERISTICS IDENTIFICATION Solubility (Vol. 4) Practically insoluble in water, very soluble in ethanol Melting point (Vol. 4) About 57o Test for phenol An ethanolic solution (1 g in 10 ml) produces a green colour upon addition of 10% ferric chloride solution PURITY Total ash (Vol. 4) Not more than 0.05% Lead (Vol. 4) Not more than 2 mg/kg Determine using an atomic absorption technique appropriate to the specified level. The selection of sample size and method of sample preparation may be based on the principles of the method described in Volume 4, “Instrumental Methods.” METHOD OF ASSAY Weigh 2.000 g of o-phenylphenol, dissolve in 10 ml of 10% sodium hydroxide solution by warming and dilute to 500.0 ml. Pipette 25.0 ml into a 250-ml iodine flask and add 30.0 ml of 0.1 N bromide-bromate TS and 50 ml of anhydrous methanol. Place the stopper in the flask and add 10 ml of dilute (1 to 1) hydrochloric acid to the well. Raise the stopper slightly to allow the acid to flow down the sides inside the flask, but retain a small amount of the acid in the well to act as a seal. Mix the contents by swirling and allow it to react for exactly 30 sec at 25±5o. Immediately add 10 ml of 20% potassium iodide solution to the well and allow it to drain into the assay flask as for the acid. Mix well, allow the solution to stand for 5 min, shaking occasionally. Wash the stopper and the sides of the flask with water. Titrate the liberated iodine with 0.1 N sodium thiosulfate adding starch TS as the endpoint is approached. Each ml of 0.1 N bromide-bromate TS consumed is equivalent to 4.255 mg of C12H10O. o-PHENYLPHENOL SYNONYMS DEFINITION Chemical names C.A.S. number Chemical formula Structural formula Formula weight Assay DESCRIPTION FUNCTIONAL USES CHARACTERISTICS IDENTIFICATION Test for phenol PURITY Lead (Vol. 4) METHOD OF ASSAY
本文档为【o-PHENYLPHENOL-邻-苯基苯酚】,请使用软件OFFICE或WPS软件打开。作品中的文字与图均可以修改和编辑, 图片更改请在作品中右键图片并更换,文字修改请直接点击文字进行修改,也可以新增和删除文档中的内容。
该文档来自用户分享,如有侵权行为请发邮件ishare@vip.sina.com联系网站客服,我们会及时删除。
[版权声明] 本站所有资料为用户分享产生,若发现您的权利被侵害,请联系客服邮件isharekefu@iask.cn,我们尽快处理。
本作品所展示的图片、画像、字体、音乐的版权可能需版权方额外授权,请谨慎使用。
网站提供的党政主题相关内容(国旗、国徽、党徽..)目的在于配合国家政策宣传,仅限个人学习分享使用,禁止用于任何广告和商用目的。
下载需要: 免费 已有0 人下载
最新资料
资料动态
专题动态
is_501481
暂无简介~
格式:pdf
大小:105KB
软件:PDF阅读器
页数:2
分类:
上传时间:2013-09-04
浏览量:19