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碳酸氢钠是食品工业中一种应用广泛的酸度调节剂和化学膨松剂,我国规定各类需添加碳酸氢钠的食品按生产需要可适量使用。砷和砷的化合物具有较高的生物毒性,常见的砷含量测定的方法有分光光度法、原子荧光法、电感耦合等离子体质谱法等,而对于食品添加剂碳酸氢钠中的砷含量的测定,国家标准采用的方法为砷斑法,该方法为限量法,无法准确测定样品中砷的含量,局限性较大,已经难以满足当前食品安全控制要求。本文采用氢化物发生-原子荧光光谱法测定食品添加剂碳酸氢钠中的痕量砷,研究了高钠基体及其他共存离子的干扰情况,并对检测条件进行了优化。试验表明:在载流浓度为6%(HCl,v/v)、硼氢化钾浓度为1.6%(m/v)时,其检出限为0.028μg/L,相对标准偏差1.29%,回收率在96.36%-103.18%之间。应用该方法分析了食品级碳酸氢钠样品,结果令人满意。
Sodium bicarbonate is a widely used acidity regulator and chemical leavening agent in the food industry. Our country stipulates that all kinds of foods that need to add sodium bicarbonate can be used properly according to production needs. Arsenic and arsenic compounds have high biological toxicity, common methods for the determination of arsenic content spectrophotometry, atomic fluorescence spectrometry, inductively coupled plasma mass spectrometry, etc., for the determination of arsenic content in sodium bicarbonate food additives, The method adopted by the national standard is the method of arsenic spot, which is a limited method, which can not accurately determine the content of arsenic in the sample, which has a great limitation and can hardly meet the current food safety control requirements. In this paper, the determination of trace arsenic in food additive sodium bicarbonate by hydride generation-atomic fluorescence spectrometry was studied. The interference of high sodium matrix and other coexisting ions was studied, and the detection conditions were optimized. The results showed that the detection limit was 0.028 μg / L and the relative standard deviation was 1.29% at 6% (HCl, v / v) and potassium borohydride concentration of 1.6% (m / v) Between 96.36% -103.18%. Food grade sodium bicarbonate samples were analyzed with this method and the results were satisfactory.