鲤鱼耳石Micro-CT特征与水域中重金属元素响应关系研究

The coupling relationship between the Micro-CT characteristics of carp otolith and the heavy metals in waters

将激光剥蚀等离子质谱技术(LA-ICP-MS)及显微X射线断层扫描技术(Micro-CT)运用到鲤鱼耳石对水环境中重金属元素的响应关系研究中。LA-ICP-MS结果表明白洋淀水域鲤鱼耳石中的Cu和Pb含量大于密云水库相应元素的含量;Micro-CT数据统计表明白洋淀水域鲤鱼耳石的Micro-CT值高于密云水库鲤鱼耳石的Micro-CT值。原子序数大的重金属元素Cu和Pb的富集程度是导致两研究区水域Micro-CT值差异的主要原因。耳石中的元素与水体元素具有相似的分布趋势,且对水体中的相应元素有明显富集作用。因此,鲤鱼耳石Micro-CT特征与水环境中重金属元素存在一定的耦合关系,可作为标型特征指示水体中重金属元素信息。

Micro-CT technology and LA-ICP-MS were applied to studying the response relationship between carp otolith and heavy metals in waters. The LA-ICP-MS analysis has revealed that the contents of Cu and Pb of otoliths in Baiyangdian are higher than the contents of corresponding elements of otoliths in the Miyun reservoir,and the Micro-CT data show that the Micro-CT value of otolith from the Baiyangdian is higher than that from the Miyun Reservoir. The authors consider that the contents of Cu and Pb seem to be the main factors responsible for the difference of Micro-CT values of otolith from different waters. Elements in otolith show similar trend and enrichment to the corresponding elements in the water. It is thus inferred that there exists a coupling relationship between heavy metals in water and Micro-CT data,which can be used as a typomorphic characteristic to indicate the information of heavy metals in water.