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Nickel acid experimental analysis
[Indicative analysis of niacin acid] CAS No.: 67-03-8 C12H17ClN4OS·HCl=337.27 [Experimental analysis of niacin] Level: BR content: ≥99.0% PH: 2.8-3.3 Solution clarity: ≤ 0.5 turbidity standard Liquid heavy metal: ≤ 0.001% sulfate: ≤ 0.01% Dry weight loss: ≤ 5.0% absorption coefficient (E1% 1cm): 406 ~ 436 traits: white crystal or off-white crystalline powder. Micro thiazole smell. Bitter. Sensitive to light. It is easy to absorb moisture when exposed to air. Absorb 1 mol of water into a hydrate in normal air humidity. Decomposed at 248 ° C. 1 g is dissolved in about 1 ml of water, 18 ml of glycerin, 100 ml of 95% ethanol, and 315 ml of absolute ethanol, soluble in methanol, soluble in propylene glycol, and almost insoluble in ether, benzene, hexane, and chloroform. The pH of the 1% (w/V) aqueous solution was 3.13; the pH of the 0.1% (w/V) aqueous solution was 3.58. The median lethal dose (mouse, oral) was 8224 mg/kg. Uses: biochemical research. medicine. Fluorescence and phosphorescence spectrophotometric analysis of phosphorus. Fluorescence determination of mercury preservation: RT, protected from light [Nickic acid experimental analysis]