卞春丽 张芸 张玉姣 张亚娟 屈云

【摘 要】钠元素是水产品中广泛存在的营养元素，钠的含量是食品营养标签中唯一一种强制标明的矿物质，其准确测量也随之成为了一个重要课题。由于钠元素的活泼性导致了其测试的困难，一般采用大型仪器方法检测，其简单分析方法的开发一直处于停滞不前的状态。本文中阐述了一种采用湿法消解与离子选择性电极简单快速准确测试罗非鱼等水产品中钠元素含量的方法，所用设备简单易得，其准确性和加标回收率都令人满意，值得广泛推广。

【关键词】湿法消解 钠离子选择性电极 罗非鱼片

【Abstract】To Sodium element is widely presence in aquatic product. The content of sodium is the only mineral substance indicator mandatorily shown in the nutrition labeling of food. The accurate and rapid measurement became an important issue and was increasingly concerned. Its lively property leads to difficulties of its testing； the methods commonly used were relying on large-scale equipment. The development of its simple analysis method has been in a stagnant state. In this paper， tilapia fillets were pretreated by wet digestion； and then quantitatively analyzed with ion selective electrode. The contents of sodium in tilapia fillets were determined by this simple， fast and accurate method. The equipment used is simple and easy to get. The results indicated that accuracy and recovery rate were satisfied. The method is well worth widely promoted.

【Key words】Wet digestion； sodium ion selective electrode； tilapia fillets

前言（钠位于周期表的IA族，在人体中发挥重要作用，是人体调节生理机能不可或缺的元素，可维持机体正常渗透压和新陈代谢。钠摄入过多时会患上高血压等慢性病，摄人太少又会有疲劳、倦怠、虚弱的现象。因此钠元素被列为食品营养标签中唯一一种强制标明的矿物质[1]。钠元素以各种形式广泛存在与各种水产品中，因此对于水产品中钠含量的准确测量具有十分重要的意义。

2014年我国罗非鱼产量169万吨，约占世界的40%，产品出口至美国、欧盟、非洲、中东、日本等国家[2]。国外越来越关注罗非鱼产品中的钠含量。本文以罗非鱼为样本，建立一种快速准确测试钠含量的方法。

目前测定食品中钠含量的报道比较多，如原子吸收分光光度法[3]、塞曼原子吸收光谱法[4]、火焰发射光谱法[5]、离子色谱法、电感耦合等离子光谱法、温度滴定法等，这些方法有的仪器昂贵，有的操作繁琐。……