摘要目的 了解某市稀土矿区居民血液、尿液和头发样本中镧、铈、镨、钕的含量及水平,为环境稀土污染的治理及人群健康保护提供科学依据.方法 于2017年5月,选择长期生活在某市稀土矿区的居民147人为接触组,某市距离稀土矿区91 km的固阳县居民108人为对照组.采集接触组与对照组居民血液、尿液和头发样本,采用电感耦合等离子体质谱法(ICP-MS)检测两组居民样本中镧、铈、镨及钕的含量.结果 接触组人群血液样本中稀土元素镧、铈、镨、钕的中位数分别为0.854、1.724、0.132、0.839 μg/L;尿液样本中稀土元素镧、铈、镨、钕的中位数分别为0.420、0.920、0.055、0.337μg/L;头发样本中镧、铈、镨、钕的中位数分别为0.052、0.106、0.012、0.045μg/g.接触组人群血液、尿液、头发样本中4种稀土元素的含量均明显高于对照组,差异均有统计学意义(P＜0.01).结论 该市稀土矿区居民血液、尿液和头发样本中镧、铈、镨、钕含量高于非矿地区,其含量分布为铈＞镧＞钕＞镨.

abstractsObjective To investigate the levels of lanthanum,cerium,praseodymium,and neodymium in the blood,urine,and hair samples from residents in the rare earth mining area of a city in China,and to provide a scientific basis for the control of rare earth pollution and the protection of population health.Methods A total of 147 residents who had lived in the rare earth mining area of a city for a long time were selected as the exposure group,and 108 residents in Guyang County of this city who lived 91 km away from the rare earth mining area were selected as the control group.Blood,urine,and hair samples were collected from the residents in both groups.Inductively coupled plasma mass spectrometry was used to determine the content of lanthanum,cerium,praseodymium,and neodymium in blood,urine,and hair samples.Results In the exposure group,the median levels of lanthanum,cerium,praseodymium,and neodymium were 0.854,1.724,0.132,and 0.839 μg/L,respectively,in blood samples,0.420,0.920,0.055,and 0.337 μg/L,respectively,in urine samples,and 0.052,0.106,0.012,and 0.045 μg/g,respectively,in hair samples.The exposure group had significantly higher levels of the four rare earth elements in blood,urine,and hair samples than the control group(P＜0.01).Conclusion The residents in the rare earth mining area of this city have higher content of lanthanum,cerium,praseodymium,and neodymium in blood,urine,and hair than those in the non-mining area;the content of cerium is highest,followed by lanthanum,neodymium,and praseodymium.