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汞是一种有毒元素,在人体内积蓄到一定浓度时能导致中毒,国家标准GB2762—94规定食品中汞的允许量最大不超过0.05mg·kg~(-1).螺旋藻是一种植物性菌类保健食品,蛋白质含量达60%～70%.在测定食品中总汞的方法中,有在强酸性介质中,用二氯化锡作还原剂的测汞仪法,以及用双硫腙与汞离子形成络合物的比色法.由于测汞仪的稳定性不足,仪器成本高,操作不便,故测汞仪法未能广泛应用,而比色法灵敏度较低,操作繁琐,所使用试剂毒性大,在实际工作较少使用.本法使用样品自动回流消化仪,VA-90气态原子化装置及原子吸收分光光度计,建立了测定出口螺旋藻中总汞的方法,进行了样品消化方式、还原剂用量、载气流量等方面的研究.结果表明,本法具有灵敏度高,精密度好,准确和简便快速等优点.由于样品消化和原子化装置
Mercury is a toxic element that can cause poisoning when accumulated to a certain concentration in the human body. The national standard GB2762-94 stipulates that the allowable amount of mercury in food should not exceed 0.05 mg · kg -1. Spirulina is a kind of plant Sexual fungi health food, protein content of 60% to 70% .In the determination of total mercury in food, there are strong acid medium, the use of tin dichloride as a reducing agent mercury analyzer method, and the use of dithio Hydrazone and mercury ion complex formation of the colorimetric method. Mercury analyzer due to the lack of stability, the instrument cost is high, inconvenient to operate, it is not widely used mercury detector method, and colorimetric sensitivity is low, complicated operation, Reagents used in the toxicity of less practical use less use of this law using automatic sample digestion analyzer VA-90 gas atomization apparatus and atomic absorption spectrophotometer established a method for the determination of total mercury exports Spirulina was carried out Sample digestion method, the amount of reducing agent, carrier gas flow rate and other aspects of the study.The results show that the method has the advantages of high sensitivity, good precision, accurate and simple and fast, etc. As the sample digestion and atomization device