10468
Total mercury ( THg ) concentrations in zebra mussels were approximately seven times greater in Onondaga Lake than in Otisco Lake , and water column mercury concentrations differed by an order of magnitude between the two lakes .
 Chemical: mercury; Chemical: mercury
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: mercury; Chemical: mercury