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目的:建立用火焰原子吸收法测定水产品中钡的方法。方法:样品经湿法消解后,消解液中的钡用硫酸沉淀过滤,硫酸钡在氨碱性EDTA溶液中煮沸溶解,在波长553.6 nm处用火焰原子吸收法测定水产品中钡的含量。结果:采用本法,钡浓度在0 mg/L～200 mg/L范围内与吸光度呈良好的线性关系(r=0.99923),方法的检出限为5.2 mg/kg。测定样品的相对标准偏差在2.0%～3.5%之间,回收率在92.2%～101.4%之间。结论:该方法操作简便,线性范围宽,干扰因素小,有较好的精密度和准确度,可用于水产品中钡的定量检测。
Objective: To establish a method for the determination of barium in aquatic products by flame atomic absorption spectrometry. Methods: After wet digestion, the barium in the digestion solution was filtered by sulfuric acid and precipitated. Barium sulfate was boiled and dissolved in ammonia-EDTA solution. The content of barium in aquatic products was determined by flame atomic absorption spectrometry at a wavelength of 553.6 nm. Results: With this method, the linear relationship between the concentration of barium and absorbance was obtained in the range of 0 mg / L ~ 200 mg / L (r = 0.99923). The detection limit was 5.2 mg / kg. The relative standard deviations (RSDs) of the measured samples ranged from 2.0% to 3.5%, and the recoveries ranged from 92.2% to 101.4%. Conclusion: The method is simple and easy to operate with wide linear range, small interference factor, good precision and accuracy. It can be used for the quantitative detection of barium in aquatic products.