14778
Previous toxicity tests with earthworms and F2 , as well as two subfractions of F3 , F3a ( > C16 - C23 ) and F3a ( > C23 - C34 ) , indicate that test durations might not be sufficiently long to reach threshold effect concentrations , likely because of the differing toxicokinetics for each distillate .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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