10156
The aim of the present study was to test if this disturbance affected the bioavailability of total mercury ( THg ) and methylmercury ( MeHg ) in surficial sediments to a benthic invertebrate ( Echinogammarus ischnus ) .
 Chemical: mercury; Chemical: methylmercury; Chemical: MeHg
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: methylmercury; Chemical: MeHg