Wang Lijun1, Liang Tao(1*), Zhang Chaosheng2, Ding Shiming1, Ding Liqiang3, Yan Xin((1.Institute of Geography Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2. Department of Geography and Environmental Change Institute, National University of Ireland, Galway, Ireland; 3. Environmental Monitoring Station of Tianjin, Tianjin 300191, China; 4. Institute of Geology, Chinese Academy of Sciences, Beijing 100029, China)
Concentrations and distribution patterns of rare earth elements(REEs)in the intertidal flat of Tianjin were studied using P(507) resin and ICP-MS analytical technology. The results show that average concentrations of REEs in the filtered(dissolved REEs), unfiltered and interstitial water are 0.461 μg·L~(-1), 4.98 μg·L~(-1) and 0.845 μg·L~(-1), respectively. Their distribution patterns are similar to those in inland natural rivers, but quite different from those in oceans. The average concentrations of REEs in sediments and suspended matters are 161.2 (mg·L~(-1)) and 168.1 mg·L~(-1), respectively, which are much lower than those in sediments of natural rivers but higher than those in sediments of the continental shelf of East China Sea. It is suggested that REEs in sediments and suspended matters of intertidal flat can have mainly originated from terrestrial soils and thus their transportation and transformation processes are similar with those in rivers, and different from those in continental shelves. Pollutants discharged into the Bohai Bay do·not cause significant effect on REEs in the intertidal flat of Tianjin yet.
intertidal flat; distribution pattern;rave earth
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