摘要
建立光谱滴定法用于葡萄酒中总酸含量的测定方法,试验并讨论了光谱滴定参数G_(a*-b*)为滴定终点参数,峰型凸出、无干扰;确定取样体积为5 mL,酚酞作为指示剂,光谱范围380 nm~780 nm,△λ=5 nm,光程10 nm,采样频率200 ms,积分周期20 ms;方法检出限为0.082 g/L,9次平行测定值的相对标准偏差为1.21%,3个加标水平的回收率分别为95.5%、96.8%、101.7%。与国家标准规定的指示剂法测定结果进行比对,测定结果无显著性差异,该方法操作简便,测定快速。
The spectral titration method is established for the determination of the total acid content in wine.The spectral titration parameter G_(a*-b*)is the titration end parameter,and the peak type protrudes and has no interference;Determine the sampling volume as 5 mL,phenolphthalein as indicator,and the spectral range is 380 nm-780 nm,△λ=5 nm,optical path 10 nm,sampling frequency 200 ms,integration period 20 ms;The detection limit of the method was 0.082 g/L,the relative standard deviation of 9 parallel determinations was 1.21%,and the recoveries of the 3 spiked levels were 95.5%,96.8%,and 101.7%,respectively.Compared with the indicator measurement results stipulated by the national standard,there was no significant difference in the results.The method is easy to operate and fast to measure.
作者
王飞
吕萍萍
于炳欣
张悦
汪海波
李佳琪
关朝亮
刘芳
温昊松
WANG Fei;LYU Pingping;YU Bingxin;ZHAGN Yue;WANG Haibo;LI Jiaqi;GUAN Chaoliang;LIU Fang;WEN Haosong(Technology Center of Qinhuangdao Customs,Qinhuangdao Hebei,066000,China;Comprehensive Technology Center of Suifenhe Customs;Technology Center Coal Detection of Qinhuangdao Customs)
出处
《质量安全与检验检测》
2022年第3期8-10,共3页
QUALITY SAFETY INSPECTION AND TESTING
基金
海关总署科技计划项目--基于光谱滴定理论的进出口商品快速检验技术及装备研发(2020HK215)。
关键词
光谱滴定
葡萄酒
总酸
Spectral titration
Wine
Total Acid
