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Determination of fluoride; acid-base indicator, pH 3.7 (yellow) ~ 5.2 (purple); can generate colored compounds with many metal ions, for the color reaction and colorimetric determination of zirconium, thorium, aluminum 365bet娱乐book, titanium and beryllium ; Microscopic stains, in vivo staining of nerve tissues, chromosome staining in plant cytology and reagents for detecting belladonnaine 

SPECIFICATION OF CAS: 130-22-3 Alizarin Red S

Production of CAS: 130-22-3 Alizarin Red S

A preparation method of water-soluble Alizarin Red S, the steps are as follows: (1) In a 10000ml three-necked flask, add 2500g of fuming sulfuric acid (20% SO3 by weight), add 1000g of alizarin powder while stirring at room temperature, about 30 minutes After the internal addition is complete, raise the reaction temperature to 42°C, heat at 110°C for 4-5h, after the reaction is complete; 365bet娱乐book ⑵ add the reaction product to 10L of water, filter the formed precipitate (minor amount), add the filtrate to chlorination at 40°C Sodium was salted out, and after cooling, it was allowed to stand overnight, filtered, and washed with 1000 ml of 10% sodium chloride aqueous solution to obtain 4050 g of paste. (3) After removing the salt and other impurities, it is washed with ethanol, ether, and dried Alizarin Red S.

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