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采用液－液萃取与反萃取分离富集方法和 ＩＣＰ－ＭＳ测试技术，对长江河口南支盐度 ０． １５～１９ ｍｇ／ｇ表层水体中溶解态稀土元素（ＲＥＥ）的浓度进行了测定．与世界其他河口相比，长江口溶解态 ＲＥＥ的河水端员浓度相对偏低，仅为 １１．９６３（Ｙ）～ ０．０９８（Ｌｕ） ｎｇ／ｋｇ．溶解态 ＲＥＥ在长江口低盐度区（０．１５～ １ｍｇ／ｇ）明显析出，但其析出率相对偏低，仅为 ４７％（Ｌａ）～２５％（Ｌ）左右．由于长江口水体较浅，水与沉积物强烈的相互作用引起溶解态ＲＥＥ在盐度１～８ ｍｇ／ｇ区段出现浓度凸起峰．颗粒物的解吸或部分溶解过程导致溶解态 ＲＥＥ浓度长江口中高盐度区（８～１９ ｍｇ／ｇ）显著递升．
The liquid-liquid extraction and back extraction separation and enrichment method and ICP-MS testing techniques were used to measure the salinity of the south branch of the Yangtze Estuary. The concentration of REE dissolved in surface water of 15-19 mg / g was measured. Compared with other estuaries in other parts of the world, the concentration of dissolved end REE in the estuary was relatively low, ranging from 11.963 (Y) to 0.098 (Lu) ng / kg. The dissolved REE was obviously precipitated in the low salinity area of the Yangtze Estuary (0.15-1 mg / g), but its precipitation rate was relatively low, only about 47% (La) ~ 25% (L). Due to the shallow water in the Changjiang Estuary, strong interaction between water and sediment caused the concentration peak of dissolved REE to appear in the salinity range of 1-8 mg / g. Particulate desorption or partial dissolution process led to the dissolved REE concentration in the Yangtze River estuary high salinity (8 ~ 19 mg / g) increased significantly.