4946
Despite the considerable fouling of GAC by organic matter and oil , 50 to 90 % of the most available PAH was extracted by the GAC during a 28 - d contact time , at a dose as low as 4 % , which also is a feasible dose in field - scale applications aimed at cleaning the sediment by GAC addition and removal .
 Chemical: PAH
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: PAH