Clausen B, Wolstrup C
Nord Vet Med. 1978 Jun;30(6):260-6.
Organs from 91 Mule Swans were analyzed for copper and lead. Swans from an area known to be polluted with copper had an average copper content in their livers of nearly 1100 mg/kg or more than twice as much as swams from other parts of Denmark.
对91只疣鼻天鹅的器官进行了铜和铅含量分析。来自已知受铜污染地区的天鹅，其肝脏中的铜平均含量近1100毫克/千克，是丹麦其他地区天鹅的两倍多。
