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The arsenic concentration was determined using atomic fluorescence spectrometry ( AFS ) in liver and muscle of exposed fish showing As accumulation in the liver after 30 days of exposure .
 Chemical: arsenic; Chemical: As
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: arsenic; Chemical: As