摘要
Oxidation reaction of tannic acid by I 2 was used in the determination of tannic acid in Chinese gall nut by ultraviolet spectrophotometry in aqueous ethanol solution, where I 2 exhibits a sensitive absorption at 289 nm. The linear regression equation of the method is A=0.018 61+0.245 3c(mg/L) with a correlation coefficient of 0.999 8. The linear response range is 0.0～2.0 mg/L, the apparent molar absorptivity is 4.14× 10 5 L/(mol·cm) and the recovery is in the range of 97.8%～104.3%. The method has the advantages of simplicity, high sensitivity and rapidity.
Oxidation reaction of tannic acid by I 2 was used in the determination of tannic acid in Chinese gall nut by ultraviolet spectrophotometry in aqueous ethanol solution, where I 2 exhibits a sensitive absorption at 289 nm. The linear regression equation of the method is A=0.018 61+0.245 3c(mg/L) with a correlation coefficient of 0.999 8. The linear response range is 0.0～2.0 mg/L, the apparent molar absorptivity is 4.14× 10 5 L/(mol·cm) and the recovery is in the range of 97.8%～104.3%. The method has the advantages of simplicity, high sensitivity and rapidity.
出处
《应用化学》
CAS
CSCD
北大核心
2005年第2期227-229,共3页
Chinese Journal of Applied Chemistry
关键词
单宁
五倍子
碘氧化
紫外分光光度法
tannic acid,Chinese gall nut,iodine oxidation,ultraviolet spectrophotometry
