应用ICP-MS法研究我国三种经济海藻中稀土元素含量

为探讨我国主要经济海藻中稀土元素的含量及分布特征，应用电感耦合等离子体质谱法（ICP-MS）对我国海藻主产地采集的30份海带、30份紫菜和15份浒苔样品的15种稀土含量进行检测研究。检测结果表明不同海藻中稀土元素含量不同，浒苔中15种稀土元素的总量最高，为16 012.0 ng·g-1，海带和紫菜中的含量相当，分别为3 887.4和4 318.1 ng·g-1。海带样品中15种稀土的含量在7.9～1 496.4 ng·g-1范围，紫菜中各稀土元素的含量范围为8.2～1 836.6 ng·g-1，浒苔中稀土元素含量最高，在19.2～6 014.5 ng·g-1范围，其中含量最高的三种稀土元素分别是铈Ce（6 014.5 ng·g-1）、镧La（2 902.9 ng·g-1）和钕Nd（2 601.0 ng·g-1）。不同海藻中不同种类稀土元素的含量分布不同，海带中平均含量最高的是Ce（1 496.4 ng·g-1），其次为La（689.1 ng·g-1），紫菜中平均含量最高的是Y（1 836.6 ng·g-1），其次为Ce（682.8 ng·g-1）;浒苔中平均含量最高的是Ce（6 014.5 ng·g-1），其次为La（2 902.9 ng·g-1）。三种海藻对轻稀土元素的富集能力远高于重稀土元素，海带、紫菜和浒苔中轻稀土元素分别占总稀土含量的90.9%, 87.3%和91.1%。浒苔富含稀土元素为浒苔资源的有效利用开辟新的研发方向，提供重要数据支持。

Application of ICP-MS to Detect Rare Earth Elements in Three Economic Macroalgaes in China

In order to investigate the content and distribution of rare earth elements (REE) in main economic macroalgaes in our country, fifteen rare earth elements in three economic macroalgaes (including 30 samples of kelp, 30 samples of laver and 15 samples of Enteromorpha) were detected using ICP-MS method. Results showed that the total content of REE in different species of macroalgaes was different. The highest total content of REE was in Enteromorpha (16 012.0 ng·g-1), while in kelp and laver, the total REE was similar for two macroalgaes (3 887.4 and 4 318.1 ng·g-1 respectively). The content of fifteen rare earth elements in kelp ranged from 7.9 to 1 496.4 ng·g-1; in laver, it ranged from 8.2 to 1 836.6 ng·g-1. For Enteromorpha, the concentration of 15 rare earth elements were between 19.2 and 6 014.5 ng·g-1. In addition, the content and distribution of different rare earth elements in different macroalgaes was also different. For kelp, the highest content of REE was Ce (1 496.4 ng·g-1), and the second was La (689.1 ng·g-1). For laver, the highest was Y (1 836.6 ng·g-1), and the second was Ce (682.2 ng·g-1). For Enteromorpha, the highest was Ce (6 014.5 ng·g-1), and the second was La (2 902.9 ng·g-1). Present results also showed that three macroalgaes accumulated the light rare earth elements much more than the high rare earth elements. The light rare earth elements occupied 90.9%, 87.3% and 91.1% for kelp, laver and Enteromorpha respectively. The result that the Enteromorpha had high content of rare earth elements could provide important support for opening new research directions for the utilization of Enteromorpha.