不同色泽大米中5种金属元素检测及膳食风险分析

Detection and dietary risk assessment of 5 kinds of metallic elements in different color rice

目的建立湿法消解和火焰原子吸收光谱法检测3种大米中Ca、Fe、Mn、Cu和Zn等5种金属元素含量的方法,并评估其膳食风险。方法以云南省红河县紫米、红米和白米为实验对象,湿法消解处理大米样品,采用火焰原子吸收光谱法分别检测分析3种大米中5种金属元素含量,结合单一元素可耐受最高摄入量及靶标危害商值(target hazard quotient,THQ)进行大米膳食风险分析。结果3种大米中均检测出Ca、Fe、Mn、Cu和Zn元素;紫米和白米中各元素回收率分别在97.96%~101.45%和97.27%~102.97%之间,相对标准偏差(relative standard deviations,RSDs)值分别在1.52%~2.31%和0.42%~2.41%之间,方法可靠。结论湿法消解和火焰原子吸收法精密度好、准确度高,适用于测定3种大米中Ca、Fe、Mn、Cu和Zn元素含量,所测元素的THQ均小于1,食用3种大米均不会产生非致癌健康风险。

Objective To establish a method for the determination of the content of 5 kinds of metallic elements,including Ca,Fe,Mn,Cu,and Zn,in 3 kinds of rice using wet digestion and flame atomic absorption chromatography,and evaluate their dietary risk assessment.Methods Purple rice,red rice and white rice from Honghe County of Yunnan Province were taken as experimental objects.The samples were processed by wet digestion,and the content of 5 metal elements in 3 kinds of rice was detected and analyzed by flame atomic absorption spectrometry.The dietary risk of rice was analyzed by combining the maximum tolerable intake of a single-element and the target hazard quotient(THQ).Results Ca,Fe,Mn,Cu and Zn elements were detected in all 3 kinds of rice.The recoveries of elements in purple rice and white rice were 97.96%–101.45%and 97.27%–102.97%,respectively,and the relative standard deviations(RSDs)values were 1.52%–2.31%and 0.42%–2.41%,respectively.The method was reliable.Conclusion The wet digestion method and flame atomic absorption method have good precision and high accuracy,and are suitable for the determination of Ca,Fe,Mn,Cu and Zn content in 3 kinds of rice.The THQ of the measured elements is less than 1,and the consumption of 3 kinds of rice will not cause non-carcinogenic health risks.