韶关学院学报
韶關學院學報
소관학원학보
Journal of Shaoguan University(Social Science Edition)
2012年
10期
51~53
,共null页
维生素C 雪莲果 分光光度法
維生素C 雪蓮果 分光光度法
유생소C 설련과 분광광도법
vitamin C; Smallanthus sonchifolius; spectrophotometry
利用维生素C定量将铁(Ⅲ)还原为铁(Ⅱ),铁(Ⅱ)与邻二氮菲发生显色反应,多余的铁(III)用磷酸溶液掩蔽.结果表明,在pH=4.0的溶液中,维生素C的线性范围为0-12.8μg·mL^-1,表观摩尔吸收系数8=2.03×10^-1L·mol^-1·cm^-1,加标回收率为97.30%-98.5%,变异系数为1.1%.该方法简便、准确、灵敏,是测量新鲜雪莲果中维生素C的一种有效方法.
利用維生素C定量將鐵(Ⅲ)還原為鐵(Ⅱ),鐵(Ⅱ)與鄰二氮菲髮生顯色反應,多餘的鐵(III)用燐痠溶液掩蔽.結果錶明,在pH=4.0的溶液中,維生素C的線性範圍為0-12.8μg·mL^-1,錶觀摩爾吸收繫數8=2.03×10^-1L·mol^-1·cm^-1,加標迴收率為97.30%-98.5%,變異繫數為1.1%.該方法簡便、準確、靈敏,是測量新鮮雪蓮果中維生素C的一種有效方法.
이용유생소C정량장철(Ⅲ)환원위철(Ⅱ),철(Ⅱ)여린이담비발생현색반응,다여적철(III)용린산용액엄폐.결과표명,재pH=4.0적용액중,유생소C적선성범위위0-12.8μg·mL^-1,표관마이흡수계수8=2.03×10^-1L·mol^-1·cm^-1,가표회수솔위97.30%-98.5%,변이계수위1.1%.해방법간편、준학、령민,시측량신선설련과중유생소C적일충유효방법.
This paper has investigated the chromogenic reaction between phenanthroline and Fe (II )by first reducing Fe (III)to Fe ( II )with vitamin C quantitatively, the surplus Fe( III )being occulted by phosphoric acid solution. The results indicate that the linear range of determination of vitamin C in solution at pH 4.0 is 0-12.8 μg.mL^-1. The apparent molar absorptivity is 2.03×10^4 L.mol^-1.cm^-1, the recovery is 97.3%- 98.5%, and the relative standard deviation is 1.1%. The method is simple, accurate and sensitive and is effective at the determination of vitamin C in Smallanthus sonchifolius.