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应用石墨炉原子吸收光谱技术建立了在海藻制品中测定总砷和三价无机砷的方法,为开展海藻制品中无机砷的监测和食品安全风险评估提供准确的检测方法。采用湿法消解和微波消解为测定总砷的前处理方式,9m ol/L盐酸浸泡后乙酸丁酯萃取和纯水反萃取作为海藻制品中三价无机砷的提取方式,分别利用塞曼扣背景和氘灯扣背景的石墨炉原子吸收光谱法测定总砷和三价无机砷。塞曼扣背景测定砷的线性范围为3.0—60μg/L,定量限(LOQ)为2.9μg/L,精密度为3.6%,回收率为90%—102%;氘灯扣背景测定砷的线性范围为4.0—80μg/L,定量限(LOQ)为3.6μg/L,精密度为4.1%,回收率为88%—109%。本法对三价无机砷的提取方法简便实用、提取效率高。原子吸收光谱法的两种背景校正方式测定总砷及三价无机砷的结果准确可靠。为基层实验室开展食品中总砷以及三价无机砷的测定提供实用、可靠的分析方法。
The method for determination of total arsenic and trivalent inorganic arsenic in seaweed products was established by graphite furnace atomic absorption spectrometry to provide an accurate detection method for the monitoring of inorganic arsenic in seaweed products and food safety risk assessment. Wet digestion and microwave digestion were used as the pretreatment method to determine total arsenic. Butyl acetate extraction and pure water back extraction after soaking with 9 mol / L hydrochloric acid were used as extraction methods for trivalent inorganic arsenic in seaweed products. Determination of Total Arsenic and Trivalent Inorganic Arsenic by Graphite Furnace Atomic Absorption Spectrometry with Deuterium Lampholder Background. The linear range of Zeeman buckle background was 3.0-60μg / L, the limit of quantification (LOQ) was 2.9μg / L, the precision was 3.6% and the recovery was 90% -102% The range of 4.0-80μg / L, LOQ of 3.6μg / L, precision of 4.1% and recovery of 88% -109%. This method of trivalent inorganic arsenic extraction method is simple and practical, high extraction efficiency. The two background correction methods of atomic absorption spectrometry for the determination of total arsenic and trivalent inorganic arsenic are accurate and reliable. It provides a practical and reliable analytical method for the determination of total arsenic and trivalent inorganic arsenic in food in grass-roots laboratories.