7526
Elimination rate constants ranged between 0 . 04 and 0 . 20 day ( - 1 ) and were negligible ( k ( 2 ) < 0 . 001 day ( - 1 ) ) at pH 4 . 5 and 6 . 5 .
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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:
 None