关键词: 地龙, 稀土元素, 富集, 土壤, 健康风险

Abstract: To analyze the distribution patterns, enrichment characteristics, temporal dynamic content patterns, and correlations between 14 rare earth elements in soil systems of karst areas and different growth years of earthworms and to provide scientific basis for the health risk assessment and enrichment characteristics of rare earth elements in Dilong. Samples of different ages of earthworms and soil were collecting, and using inductively coupled plasma mass spectrometry (ICP-MS) to determine the content of rare earth elements in earthworms and soil of different ages. Results showed that the distribution patterns of soil rare earth elements and 14 rare earth elements in earthworms showed significant inheritance. They did not undergo significant fractionation during transport within the earthworms, and the biological enrichment coefficient was only 0.01-0.02. There was no significant correlation between rare earth element content and growth age, but there was a significant positive correlation between elements. The rare earth element content in earthworms was in the order of Ce>La>Nd>Pr>Gd>Sm>Dy>Eu>Er>Yb>Tb>Ho>Tm>Lu. The distribution characteristics of rare earth elements in earthworms were clearly indirectly regulated by soil for bioaccumulation, and their enrichment ability was weak. The acceptable daily intake (ADI) of rare earth elements in earthworms was far below the safety limit of 0.07 mg/（kg·d）, and did not pose a health risk. This provided a reference for soil aquaculture of earthworms in karst areas.

Key words: Dilong, rare earth elements, enrichment, soil, health risks