万源富硒茶叶总硒及有机硒含量评价

Evaluation of Total Selenium and Organic Selenium Content in Wanyuan Selenium-Rich Tea

摘要: 采用混合酸(硝酸:盐酸/4:1)对样品进行消解前处理，通过氢化物发生原子荧光光谱法测定万源不同品牌的富硒茶叶和普通茶叶中有机硒的含量，并进行评价和分析。结果表明，硒的最低检出限为9.3 μg/L，线性范围为50 μg/L~500 μg/L，标回收率为92.2%~101.5%，总硒重复性相对标准偏差(RSD)为2.16%，无机硒重复性相对标准偏差(RSD)为1.83%，有机硒含量占总硒含量的85%~93%。该方法样品处理和分析方法可靠、检出限低、回收率高和重复性较好，可应用于万源地区富硒茶叶中硒含量的测定与评价，为万源地区进一步开发富硒茶提供理论依据和技术支持。

Abstract: The sample was digested with mixed acid (nitric acid:hydrochloric acid/4:1), the hydride genera-tion atomic fluorescence spectrometry was used to detect the organic selenium in different-rich tea and ordinary tea from Different Brands of Wanyuan. The results showed that the minimum detection limit of selenium is 9.3 μg/L, the linear range is 50 μg/L - 500 μg/L, the standard recovery rate is 92.2% - 101.5%, the total selenium repeatability relative standard deviation (RSD) is 2.16%, the inorganic selenium repeatability relative standard deviation (RSD) is 1.83%, the organic selenium accounts for 85% - 93% of the total selenium content. The method is reliable, low detection limit, high recovery and good repeatability. It can be applied to the determination and evaluation of selenium content in selenium-rich tea in Wanyuan area. It provides theoretical basis and technical support for the further development of selenium-rich tea in Wanyuan area.