直接进样火焰原子吸收光谱法测定果汁饮料中的铜和锰

Determination of Copper and Manganese in Juice Beverage by FAAS with Direct Sample

建立了一种用硝酸酸化样品,直接进样火焰原子吸收光谱法测定果汁饮料中铜和锰的分析方法。移取5.00mL的果汁饮料样品于10.0mL容量瓶中同时称取该样品的质量,加入400μL浓硝酸,摇匀,酸化15min,以去离子水定容至刻度,采用直接进样火焰原子吸收光谱法测定其铜、锰含量。样品铜、锰的加标回收率分别为96.6%—101.2%、97.5%—101.3%,相对标准偏差(RSD%)为0.88%、0.92%,检出限(3S/N)为0.007、0.009μg·mL^(-1)。方法简便、快捷、准确、实用,克服了以前各类消解法繁琐耗时污染环境等缺点,且该法的检出限、精密度和准确度均令人满意。本方法完全满足国家食品卫生标准中对饮料中铜和锰元素的分析检测要求。

The analytical method for determination of copper and manganese in juice beverage by flame atomic absorption spectrometry（FAAS） with direct sample was established. The samples were acidized by nitric acid. Juice beverage sample（5.00mL） was took into 10.0mL volumetric flask at the same time mass of sample was weighed, 400μL concentrated nitric acid was added to shake up with acidification for 15min,then volumetric flask was constant volume by deionized water,and contents of copper and manganese were determined by direct-sample flame atomic absorption spectrometry. The recoveries of copper and manganese were respectively from 96. 6% to 101. 2%, from 97. 5% to 101.3% with the relative standard deviation （RSD） of 0. 88% and 0. 92%, the detection limits （3S/N） were 0. 007μg · mL^- 1 and 0. 009μg · mL^-1. The method is simple,rapid,accurate, rapid and reliable with satisfactory detection limits, precision and accuracy, and overcomes palaver, time-consuming and pollution disadvantages. This method meets the requirements of the national standards of food hygiene in copper and manganese elements analysis of the beverage.