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海水样品是在东京大学海洋研究所科学考察船（淡青丸KT）93－14次航海期间，于1993年9月12日在日本伊豆-小笠原海沟海域（29°05′N，142°51′E，水深9500m）采集的。采用化学萃取-反萃取分离法并结合等离子质谱仪，对样品进行分析研究。结果表明，海水中重稀土相对于轻稀土富集，相对于重稀土和轻稀土来说，中稀土有一定程度的亏损。钇浓度从海水表面随深度的增加而逐渐增加，与稀土元素一样在海水断面上呈营养盐型分布。同时还发现Ho是稀土中与Y相关性最好的元素，并指出Ho／Y的浓度比同样可以用来示踪海洋中水团的移动。
Seawater samples were collected during the 93-14 sailing of the Scientific Research Vessel at Ocean University of Tokyo (Dan Koyu KT) on September 12, 1993 in the sea area of Japan Izu-Ogasawara trench (29 ° 05’N, 142 ° 51’E , Water depth 9500m) collected. The chemical extraction - back extraction separation method combined with plasma mass spectrometry, the analysis of the sample. The results show that heavy rare earths in seawater are enriched relative to light rare earths, and the middle rare earths have a certain loss compared with heavy rare earths and light rare earths. The concentration of yttrium gradually increased from the surface of seawater with the increase of depth, which was similar to rare earth elements in the distribution of nutrients in seawater. It is also found that Ho is the best element related to Y in rare earths and points out that the Ho / Y concentration ratio can also be used to track the movement of water masses in the ocean.