12696
Cadmium ( Cd ) and zinc ( Zn ) in surface water , sediment , carp , and crab samples collected from upstream and downstream regions of coastal watersheds along the Chinese Northern Bohai and Yellow Seas were analyzed to provide a comprehensive understanding and assessment of their environmental concentrations and bioaccumulations .
 Chemical: Cadmium; Chemical: Cd; Chemical: zinc; Chemical: Zn
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Cadmium; Chemical: Cd; Chemical: zinc; Chemical: Zn